Fam. 4. Diphyllidiada.
TYPE. Gen. 18. Diphyllidia, Cuv. Cloak exposing the head, coriaceous; tentacles
laminated longitudinally, approximated, partially retractile
within a common cavity; veil reflected; branchiae of two
kinds, the anterior longitudinally folded, the posterior transversely.
Tongue broad, with numerous simple lateral spines
and a denticulated central spine. Corneous jaws . D. lineata, Otto.
Section 2. With the branchiae on the upper side of the cloak.
Fam. 5. Tritoniadce.
Gen. 19. Tritonia, Cuv. Branchiae plumose; tentacles 2, fasciculated, _
retractile within plain sheaths; veil digitated. Tongue broad,
with numerous simple or denticulated lateral spines, a tricuspid
central spine, and a broad plate on each side of it. Large
corneous jaws • . . . T. Hombergii, Cuv.
Fam. 6. Scyttceida.
Gen. 20. Scyllea, Linn. Branchiae plumose, scattered over the lateral
lobes on the inner surface; veil small; tentacles 2, laminated,
with large compressed sheaths. Tongue broad, with numerous
lateral spines and a central spine, all denticulated. Large
corneous jaws . . . . S. pelagica, Linn.
Tribe 2. Liver diffused; branchiae papillose, simple or branched.
Section 1. With a posterior central gastro-hepatic vessel; reproductive organs with
single external orifice.
a. With the posterior vessel of the gastro-hepatic system below the ovary.
Fam. 7. Dendronotidce.
Gen. 21. Dendronqttts, A. and H. Body compressed, without cloak;
branchiae ramose; veil branched; tentacles laminated, with
branched sheaths. Tongue rather narrow, with several lateral
spines, and a larger central spine, all denticulated
Gen. 22. Bornella, Gray. Body compressed, without cloak; tentacles
2, retractile within branched sheaths; front of the head with
2 stellated or fimbriated appendages; branchiae plumose,
arranged on plain branched pedicles. Tongue?
Gen. 23. Lomanotus, Ver. Body subquadrilateral; branchiae papillose or
foliaceous, arranged in a nearly continuous line on a pallial
margin ; tentacles 2, laminated, with sheaths. Tongue broad,
with numerous denticulated spines ; no central spine. Corneous
jaws
Gen. 24. H ero, L ov. Cloak wanting; tentacles 2, linear, simple, non-
retractile; veil rather large, plain, produced at the sides;
branchiae branched or umbellated. Tongue with a large central
denticulated spine, and 2 simple lateral spines. Corneous jaws
D. arborescens, Mull.
B. digitata, Adams.
L. Genei, Ver.
H. form osa, Lov.
Fam. 8. TetliidcB.
. , , ... TYPE. Gen. 25. Tethys, Linn. Body depressed, with numerous branchial
plumes or tufts alternating with papillae on each side of the
back; veil fringed with filaments; tentacles laminated,
sheathed. No tongue. No jaws . . . T. leporina, Linn.
Fam. 9. Melibina.
Gen. 26. Melibe, Rang. Tentacles small, retractile within long, narrow,
trumpet-shaped sheaths; veil large, funnel-shaped, fringed
internally; branchiae ovate, tuberculated. Tongue ?
Gen. 27. Doto, Oken. Tentacles linear, long, with short, wide, trumpetshaped
sheaths; veil small, plain; branchiae ovate, muricated.
Tongue narrow, with a large central spine
Fam. 10. Proctonotidce.
Gen. 28. Proctonotus, A. and H. Dorsal tentacles simple, linear; veil
distinct, notched in front. Tongue broad, with numerous
smooth spines. Jaws plain . . .
Gen. 29. Antiopa, A. and. H. Dorsal tentacles laminated, united by a
semicircular crest; oral tentacles with or without a veil.
Tongue broad, with numerous lateral spines and a central one,
all simple. Jaws denticulated
Fam. 11. Glaucidce.
Gen. 30. Glaucus, Linn. Head indistinct; tentacles very short; branchiae
M. rosea, Rang.
D. fragilis, For.
compressed, tapering, arranged on broad flattened footstalks;
foot very narrow, rounded in front. Tongue narrow, with
a single plate, bearing a long stout spine and ' marginal
denticles . '. . . . G. Forsteri.
b . With the posterior vessel of the gastro-hepatic system above the ovary.
Fam. 12. JEolididcs.
Gen. 31. Calma, A. and H. Body depressed, rather broad; tentacles
small, simple, linear; branchiae linear-fusiform, clustered on
cylindrical footstalks; foot broad, anterior angles acute.
Tongue very small and narrow, bearing a single spine . C. glaucoides, A. & H.
Gen. 32. F labellina, Cuv. Body slender; dorsal tentacles laminated;
oral tentacles long; branchiae linear or fusiform, clustered
on footstalks; foot narrow, anterior angles much produced.
Tongue a central spine with marginal denticles, and two
separate plain lateral spines . . . F. affinis, Gm. ?*
* The Eolidia flabellina of Verany belongs to this genus; his E. affinis appears to be different
from that of Gmelin.
P. mucroniferus, A. & H.
A. cristata, Delle Ch.