(Polycera sensu stricto.)
1. P. quadrilineata (0 . F. Muller).
(PL 5, Fam. 1, PI. 22.)
P.plebeia Loven, P. horrida Hesse, P. doriformis Quatref., and P. canteriata
(Quatref.) seem to be merely varieties.
(Palio.)
2. P. lessonii (d’Orbigny).
(PL 4, Fam. 1, PI. 24.)
3. P. ocellata A. & H.
(PL 2, Fam. 1, PL 23.)
It may be doubted if these two forms are more than varieties of one species, but
Alder and Hancock insist on their specific distinctness.
y. PSEUDODORIDIDJE.
Shape doridiform. Radula varying from moderately broad to very narrow. Teeth
differentiated. Ingluvies buccalis present.
[Genus 1. Doridunculus G. 0. Sars.
See G. 0. Sars 1, p. 309.
This genus consists of two small and little-known forms recorded from the Scandinavian
coast. The body is flat, the foot narrow; the mantle ample but not covering the
tail. The back is covered with conical papillas and also bears two parallel longitudinal
ridges. The openings of the rhinophores are not raised or crenulate. The branchim are
few and small, simply pinnate. No labial armature is mentioned. The radula is narrow.
There is no median tooth; the first lateral is denticulate (or the first two), and is followed
by five others in which the hook gradually decreases and disappears.
The dentition makes it probable that the genus is allied to Acanthodoris, but the
characters are not fully described.
1. D. echinulatus G. 0 . Sars.
7 mm. long. Rhinophores and branchiae yellow. Branchiae 3. Radula
5 + 1. 0. 1 + 5.
2. D. pentabranchus Odhner.
Yellowish; 13 mm. long. Branchiae 5. Radula 5 + 1 + 1 . 0 . 1 + 1 + 5 .
First lateral denticulate on both sides, second on outer side only. Remaining
teeth not denticulate.]
Genus 2. Acanthodoris Gray.
See Burgh 18, pp. 237—257; id. 43, p. 988—990; 48, pp. 93—99; Meyer and Möbius 1, pp. 63—67.
Flattish doridiform animals. Back covered with papillas or villi; margin of rhino-
phore openings not much raised, papillate or lobate. Head broad, semi-circular, expanded
into tentacular lobes at the sides. Branchiae tripinnate, set in a circle. The penis is
usually armed with spines and the vagina is extremely long. The buccal crop is affixed
directly to the buccal bulb, without any stalk. The labial armature is composed of hooks,
but forms in its lower portion a cuticular plate which is often produced into two bladelike
processes. The formula of the radula is x + 1 . 0 .1 + x. The first lateral is very
large, hamate and denticulate; the rest (four to eight in number) less perfectly hamate
or flat.
1. Ac. pilosa (0 . F. Muller).
(PL 5, Fam. 1, PI. 15.)
Recorded also from N. Pacific, Tasmania, and New Zealand.
2. Ac. subquadrata A. & H.
(Pt. 5, Fam. 1, PI. 16.)
Three very uncertain species, Ac. stellata, Ac. citrina, Ac. ornata, are described by
Verrill from the Atlantic coast of America. The last should be easily recognizable if found
again. I t is said to have an angular oral veil with four processes, a smooth area in the
middle of the back, long rhinophores and branchiae which project beyond the body.
Genus 3. Adalaria B ergh.
See Bergh 18, pp. 224—237; Meyer and Möbius 1, pp. 69—70; A. and H. 2, p. 262.
This genus, which was instituted by Bergh for the Doris proxima of Alder and
Hancock, is intermediate between Acanthodoris and Lamellidoris. The radula resembles
that of the former genus, but there is no labial armature. On the other hand the
branchiae are simply pinnate as in Lamellidoris, and the openings of the rhinophore
sheaths smooth. The dorsal surface is tuberculate.
1. Ad. proxima (A. & H.).
(PL 6, Fam. 1, PI. 9.)
2. Ad. lovöni (A. & H.).
(PL 8, PI; I, jigs. 1, 2.)
Genus 4. Lamellidoris A. & H.
See Bergh 18, pp. 207—224 ; 39, pp. 612—614; 48, p. 101; Meyer and Möbius 1, pp. 73—74;
Eliot 1, pp. 345—346.
The dorsal surface is granulate or tuberculate; the margins of the rhinophore
openings are smooth. The head is broad, crescent-shaped, with the corners produced into