OPISTHOBRANCHIATA FROM THE ABROLHOS ISLANDS. 547 
he gave no anatomical details, so that the above is the first description o£ the 
radula etc. of the species. 
Family ARCHIDOEIDID^. 
Tlie body is not hard and slightly depressed ; the notseum is tuberculate 
or granulate, the pallial margin is fairly broad ; the tentacles are small ; the 
branchial plumes are neai'lv always tri- or quadripinnate ; the foot is fairly 
broad. There is no labial armature. The radula has no rachidial tooth ; the 
pleurals are numerous and hamate. The penis is generally unarmed. 
Genus Alloiodoris Bergh, 1904. 
Type by monotypy : A. mai'morata Bergh, Malak. Unters. vi., 
Semp. Eeis. 1904, p. 42. 
The body is depressed, the notseum minutelj^ granulose and fairly broad. 
The branchiae are not numerous and generally tri- or quadripinnate. 
Labial armature is feeble or absent. The foot is strong and as wide as 
the body. The mantle is fleshy and well developed. There is no rachidial 
tooth. The lateral teeth are numerous and hamate. The last part of the 
vas deferens in the penis bears a series of hooks. The hermaphrodite gland 
forms a discrete mass quite distinct from the liver. 
This genus was founded by Bergh on some specimens from Tasmania, and 
is remarkable in that the hermaphrodite gland forms a discrete mass and is 
npt spread out as a layer over the liver. This is a condition encountered 
also in Bathydoris and Trevelyana, forms that for other char;icters are quite 
widely removed from the present genus. Eliot suggests (38, p. 333) that 
this perhaps represents an older condition than that in which the gland is 
spread over the liver, "and it would seem that very different families of the 
Dorididae sporadically preserve or revert to the older arrangement." 
Up to the present only two species have been referred to the genuSj 
viz., A. marmorata Bergh and A. lanuginata Abr. 
Species Alloiodoris hbdleyi^ sp. nov. (PI. 27. figs. 6 & 7 ; PI. 30. 
figs. 45-47.) 
Synonymy : A. marmorata Basedow & Hedley, Trans. Roy. Soc. South Aiistr. 1905, p. 152, 
non Bergh. 
Body. The general shape of the body is ellipiical, slightly broader at the 
posterior end, and only moderately convex. The entii'e dorsal surface is 
covered with minute spiculate papillae, making it somewhat rough to the 
touch. The mantle is very well developed, being much wider than the foot, 
and its fairly thin edge is wavy and undulating. 
Colour. The colour of the preserved specimen is a dark muddy-fawn with 
a tinge of green. Irregularly .scattered over it are a series of dark brown, 
almost black, roughly circular, ring-shaped marks from 2-3 mm. wide, 
39* 
