- 3. Portion of tlie duodenal sao of Platauix/a, exhibiting two patches of racemose
glands magnified 2 diameters.
4 The valrulae conniventes of the small intestines at its duodenal end, ahout
natural size.
5. The pancreas of Platanista, I., with its ducts laid open and showing their
relations to one another and to the .ductus communis choledochus : i.,
intestine; s., stomach; o., orifice of ductus communis choledochus in
duodenum. Reduced.
6. Interior of the common hile duct of Platanista laid open, of natural dimensions.
I t demonstrates an upper smooth mucous membrane, below
which commences, slight sacculation (s.), becoming valvular towards
(¿.), the intestinal extremity.
7. The microscopic appearance of the upper patch of mucous cups or crypts of
the ductus communis choledochus in Platanista, magnified about
8. The spleen and subjacent membrane in situ of the Susu, i natural size. "
9. Opened splenic sacs and their subsidiary sacculi of the same animal; these
dilatations being filled with a grumous substance, in the fresh condition.
Drawn of natural dimensions.
10. Posterior or abdominal surface of the liver of the Platamista, Jrd natural size:
l„ round ligament; v. <?., vena cava; h., hepatic artery, duct, and portal
vein.
11. The Platanista’s caecum and accessory gland reduced $: cce., csecal diverticulum
; i., ileum; c., colon in p art; g., gland.
PLATE XXVII.
1. Poreshortened anterior view of snout and opened mouth of the foetus of
Orcella bremrostris, J natural size: a., oral angle; e., eye; b., upper labial
bristles; t., tongue; ph., pharyngeal aperture; c., mucous crypt on velum
palate; p., palate. '
2. Tongue and larynx removed from Orcella. Seen from above with portion
of buccal and faucial or post-palatine soft parts spread put; the apex
of glottis peering out of the posterior narial chamber. Reduced *rd:
t„ tongue; p., papillae of post-lingual region; g. o., patch of faucial gland'
orifices; a. e., aryteno-epiglottic cartilages or summit of glottis.
3. A portion of the faucial membrane of Orcella bremrostris spread out and
superficially dotted, with also papillary protuberances; the former (y. o.)
being the orifices of glands whose deep structure is displayed in the
succeeding figure.
4. The under-surface of the same piece of mucous membrane, showing the deep
elongated racemose glands (g.) continued from the superficial orifices in
question. This and fig. 3, both of natural dimensions.
5. The cavities of the stomach of an adult Orcella brevirostris, opened from
below, ^rd natural size: ce., oesophagus; I, II, III, the three gastric
chambers, and IV, the duodenal chamber, the psssages between which
having rods passed through them, as in Platanista; d., duodenum; v., cut
attachments of the stomach, their continuation behind being hidden in
this view; g. points to an asterisk (*), which indicates the position of a
hsemo-lymphatic gland otherwise not brought into view (see fig. 23).
6. A highly magnified view of a group of the oesophageal glands of Orcella in
horizontal section, and enlarged to about jbo diameters.
7. A section of the stomachal gland indicated by the asterisk (*) in fig. 5, and
which same body has evident relation to the blood-vessels and enlarged
lymphatics: a., thick-walled arteries and v., veins which pierce, g., the
glandular substance, while t. points to imbedded tendinous or gristly
material.
8. A portion of the remarkable blood-vessels of the stomach of Orcella
brevirostris, frd natural size. They exhibit an irregular series of pouches
or enlargements (some here partially opened), which, there is reason to
believe, communicate with the lymphatic system, and they appear to
correspond to the so-called “ moniliform tube” described by Professor
Turner in the genus Sibbaldius.
9. The ductus communis choledochus of Orcella laid widely open, showing the
finely rugose character of the mucous coat, and indicating h. and p., the
orifices of the pancreatic hepatic ducts, \ natural size.
10. The mucous folds of the duodenum of Orcella brevirostris as contradistinguished
to the marked valvuhe conniventes of Platanista (compare
fig. 4, pi. XXVI), about natural dimensions.
11. Spleen of Orcella, with accessory splenules, \ natural size.
12. The posterior face of the liver of Orcella, -g-th natural size: v.c., vena cava;
h., hepatic vessels and duct; n., notch terminating sulcus between right
and left lobes.
13. The diaphragmatic aspect of the liver and stomach in natural position of
O. brevirostris, reduced to £th natural size : b., the broad ligament dividing
the liver into dextral and sinistral areas; I and II, portions of walls
of stomach, and IV, duodenum sack; f , fold of great omentum;
d., duodenum.
PLATE XXVIII.
1. Sketch of the fleshy portion, valves or cushions and the narial sacks of the
blow-hole of Platcmista gangetica ; these being removed en masse and
exhibited as an anatomical preparation from above and with the sacs
opened: o., orifice of blow-hole, its lips cut open; p., pair of fibrous
pads.