EXPLANATION OF THE PLATES.*
P late 7.
?• ^ • General view of the viscera of E. papillosa from above:—a, buccal mass; b, oesophagus :
c, stomach; d, intestine; e, anal nipple; f , great central canal of the digestive system;
9> 9> 9> lateral branches of the same; h, ventricle of the h eart; i, auricle; j , testicle;
Jc, k, portions of the gland for secreting the mucous envelope of the eggs; Z, l, ovarium;
m, cerebral ganglions, with the nerves passing off from them; n, n, ganglions at the base
of the dorsal tentacles.
2. Digestive apparatus of E. papillosa, with the glands of the papillae removed f—a, buccal
mass; b, b, corneous plates of the same; c, oesophagus; d, stomach; e, intestine; f anus ;
9> great central canal leading from the stomach; h, h, lateral branches leading from the
same to the papillae; i, ducts from the glands of the papillae.
3. Digestive apparatus of E. olivacea; the letters correspond with those of the previous figure.
4. Digestive apparatus of E. coronata; letters as before.
5. View of the cavity of the buccal mass from above, the fulcrum being divided, and the horny
plates, a, a, drawn apart:—b, b, cutting edge of the jaws; c, inner lip; rf, fulcrum of the
homy plates; e, anterior and posterior transverse muscles for closing and opening the
jaws; f tongue; g, g, wedge-shaped muscular mass, or support of the same; h, h,
muscular cheek mass; i, folds of the lining membrane of the mouth; j , oesophagus.
6. Lateral view of the buccal cavity and cheek mass, with a horny plate removed:—a, salivary
gland; b, inner lip; c, interior of a homy plate; d, cutting blade; e, fulcrum; ƒ, anterior
and posterior transverse muscles for closing and opening the jaws; g, flattened upper
borders of the cheek mass; h, spiny ridge of the tongue; i, oesophagus.
/. Two of the transverse arched plates from the tongue of E. papillosa, much magnified to
show the spines.
8. A portion of the tongue of E. olivacea.
9. Teeth from the tongue of E. nana.
10. Upper aspect of three plates of the same.
11. Tongue of E. alba.
12. Upper aspect of three plates of the same.
13. Stomach of E. papillosa laid open, showing the rugse of the internal surface of the bulb,
central canal, and lateral branches.
P late 8.
■ 1- General view of the vascular system, all the other viscera being removed:—-a, ventricle
of the heart; b, auricle; c, c, c, portions of the pericardium cut across and laid back;
d, aorta; e, gastric a rtery; / , great ovarian artery; g, a branch of the same, supplying the
posterior portion of the foot; h, the artery supplying the anterior portion of the organs
of generation; i, buccal artery; j, arterial branches going to the channel of the mouth
and anterior of the foot; k, buccal mass; Z, Z, large anterior veinous trunks passing from
the skin to the auricle; m, large dorsal veinous trunk receiving veins from the skin, and
passing to the amide.
2. The organs of generation partially unravelled:—a, portion of the penis withdrawn •
b, common female channel; c, c, testicle; d, ovarium; e, e, oviduct; ƒ dilated portion of
the same; g, g, great gland for secreting the mucous envelope of the eggs; h, sack of
All the anatomical figures oh these plates are from E. papillosa, unless otherwise stated.
EOLIS.
the spermatheca; i, duct of the same; j , small accessary gland of the same; k, anterior
genital artery. (The letters of this figure correspond to, and will explain those of
Plate 4, fig. 15.)
. 3. Cerebral ganglions and nerves:—a, a, central or upper ganglions; b, b, lateral ganglions;
c, under or buccal ganglions; d, d, gastric ganglions; e, inner oesophageal collar; f , outer
ditto; g, central d itto; h, h, genital and cardiac nerves; i, i, hepatic ganglions imbedded
in the muscles of the buccal mass; j , j , hepatic nerves, supplying the glands of the
papilla}; k, short cord uniting the same to the outer collar; Z, eye; m, auditory capsule;
1st pair of nerves supply the dorsal tentacles; d d, ganglions at the base of the same;
2d pair go to the outer lip ; 3d pair to the skin in front of the head; 4th pair supply
the channel of the mouth and oral tentacles; 5th pair go to the channel of the mouth
near the buccal mass; 6th, 7th, 8th, and 9 pairs, supply the skin on the sides of the body;
10th pair supply the foot; 11th pair supply the skin on the sides of the back ; 12th pair
supply the skin of the back next the median line.
4. Auditory capsule, inclosing the inner capsule and otolithes.
5. Otolithes very highly magnified:—a, one fractured by pressure.
6. Auditory capsule with otolithe of E. picta.
7. Eye of E . p icta:— a, optic nerve; b} pigment cup; c, lens; d, cornea; e, general capsule.
8. Digestive apparatus of E. despecta; letters as in PI. 7, fig. 2.
9. A branchial papilla of E. papillosa, exhibiting the hepatic gland, &c.:—a, ovate vesicle;
b, gland; c, duct; d, wall of inner sheath.
10. A papilla of E. Farrani, exhibiting the gland; lettered as the last.
11. A much enlarged representation of the upper portion of a papilla of E. papillosa:—
a, hepatic gland; b, vessel leading from the gland to the ovate vesicle, c ; d, orifice at
' the apex of the papilla communicating with the ovate vesicle; e, muscles attaching the
vesicle to the walls of the papilla; ƒ, ƒ, inner sheath inclosing the gland; g, g, muscular
bands inclosing the cellular spaces, in which the blood circulates between the inner
sheath (ƒ, ƒ ) and the skin of the papilla; h, skin of the papilla clothed with vibratile
cilia; i, i, i, circular and longitudinal muscular fibres of the skin.
12. Utriculus, or bag, from the ovate vesicle of E. papillosa, containing the supposed stinging
bodies.
13. Utriculus from the ovate vesicle of E. coronata, containing the stinging and other bodies.
14. Stinging bodies of E. papillosa, with the hair-like filaments as they appear after ejection:—
a, one of these bodies, showing two dark lines in the centre.
15. Stinging bodies from the ovate vesicle of E. olivacea.
16. One of the flattened elliptical bodies, contained along with the stinging bodies in the utriculus
of E. coronata.
17. 18. External and internal views of a horny plate of the jaws of E. papillosa : a, cutting
blade; b, fulcrum, or hinge. -
19. Front view of the horny jaws:—a, cutting blades; b, hinge or fulcrum.