tentacular processes. The branchiae are simply pinnate, rather numerous and set in a
horse-shoe. There is no regular labial armature, but the oral cuticle is armed with a ring
of papillae and two ridges. The radula is very narrow, consisting of only two teeth on
either side of the rhachis, the inner large and the outer small. There is sometimes a
rather imperfectly formed median tooth and sometimes none at all. The main differences
between this genus and Acanthodons are found in (a) the branchiae, which are simply
pinnate, and (b) the buccal parts.
Sec. i. Radula with a median plate which is generally rudimentary.
1. Lamellidoris bilamellata (L.).
(.Pt. 6, Fam. 1, PL 11).
2. L. muricata (0 . F. Müller).
See Alder 1, p. 88, and Monogr., p. 42, and Appx. ii.
WimimP0™8 mwr^ca^a Meyer and Möbius, and D. muricata var. ß Loven (var.
a being Adalaria loveni). The radula contains 29 to 44 rows with a formula
o f l + 1 + 1 + 1 + 1 . The inner teeth have large bases and. about 16
denticles. The external teeth are small with a rudimentary hook.
3. L. diaphana A. & H.
(Pt. 2, Fam. 1, PI. 10.)
4. L. aspera A. & H.
(Pt. 6, Fam. 1, PI. 9.)
Sec. ii. Radula without a median plate.
5. L. sparsa A. & H.
(Pt. 4, Fam. 1, PI. 14.)
See Garstang 1, p. 179.
6. L. depressa A. & H.
(Pt. 5, Fam. A,, PI. 12.)
7. L. inconspicua A. & H.
(Pt. 5, Fam. 1, PI. 12.)
8. L. oblonga A. & H.
(Pt. 5, Fam. 1, PI. 16.)
See Garstang in Joum. Mar. Biol. Assoc., völ. vii, p. 220. Faunistic Notes
at Plymouth.
. 9. L. luteocincta M. Sars.
1111= Doris beaumonti Farran.
(Pt. 8, PI. II, figs. 8, 9.)
10. L. ? ulidiana T hompson.
(Pt. 8, PI. II, figs. 6, 7.)
A number of doubtful species from the Atlantic have been referred to this genus.
Bergh includes in his list four species from the Atlantic coast of North America (Doris
tenella, D. pallida, D. diademata and D. grisea), described in Gould 1, pp. 229—232, and
two from Arcachon (D. derelicta and D. eubalia) described by Fischer in Journ. de Conchyl.,
1867, p. 7, and 1872, p. 10. But Fischer says that the branchige of D. eubalia are retractile,
and it seems to me more probably referable to Staurodoris. Still more doubtful are
the species described by Verrill from the Bermudas (L. lactea, L. guadrimaculata, L.
aureopunda, L. mimata and L. oMvacea), several of which are said to have retractile
branchige. I t is also thought by some authorities that D. diedemata is a variety of
D. tuberculata.
S. GONiODORIDIDHS.
Body more or less limaciform, often with appendages. Rhinophores not retractile.
Radula extremely narrow (only two or four teeth). Ingluvies buccalis present.
Genus 1. Goniodoris F orbes.
See Bergh 17, pp. 115—137.
Body limaciform but somewhat stout and angular.. Pallial margin not continuous
behind. Back with tubercles and ridges. Head prominent and produced at the sides
into large, flat, tentacular processes. Rhinophores not retractile. Branchiae pinnate or
tripinnate, and varying in number. Penis armed with hooks. Buccal crop attached by
a short stalk. There is a labial armature formed of hooks or prominences, but it is often
feebly developed. Formula of radula 1 + 1 . 0 . 1 +1; inner tooth large, hamate, smooth
or denticulate; outer tooth a small plate.1
1. G. nodosa Montagu. .:
(Pt. 2, Fam. 1, PI. 18.)
2. G. castanea A. & H.
(Pt. 3, Fam. 1, PI. 19.): ■
The distribution of D. castanea is remarkably wide. It is recorded from the
Atlantic, the Mediterranean, New Zealand, and Suez. I t has perhaps a special aptitude
for migrating on the keels of ships.
[G. danielseni Friele and Hansen 1, pp. 72—73, is a doubtful form, and perhaps not
a Goniodoris at all. See G. O. Sars 1, p. 364.]
1 Bergh could find no blood-gland in this genus. Pelseneer, however, reports (1, p. 45) that it
is present, and from an examination of preserved specimens I am inclined to agree with him. But
the blood-gland and salivary glands are apt to become fused together in preserved material, and it is
difficult to demonstrate the existence of the former if it is called in question.