62 NILS HJ. ODHNER, MOLLUSOCA. 
species. Also in its manner of life, C. lixi differs from the present form in its 
occurrence on algae and clay bottoms (cf. RocHEBRUNE 1. c., p. 138). — The most 
recent publication on the genus Ceratosoma is the monograph published by ROocHE- 
BRUNE (1895). In his valuable work he gives some figures in colours of all the 
species occurring preserved in the Paris museum, and he there gives diagnoses of the 
14 forms known then. Since 1895, BERGH (in 1905) has described and figured a new 
characteristic species, C. bicorne, from MBSapeh Strait, Java Sea. Further (in 1905) 
BASEDOW and HEDLEY described and figured from York Peninsula a C. adelaide, 8 
mm in length and 3 mm in breadth. This form, as well as that described and 
figured by the same authors as C. brevicaudatum ABRAHAM, seems to belong to the 
genus Chromodoris, ALDER & HANCOCK 1855 (= Hypselodoris STIMPSON 1855). 
Doridopsis guttata n. sp. (PI. 2, fig. 71). Body elongated elliptic, entirely 
smooth, rather convex, witb a narrow, slightly undulating, perinotum or mantle 
border all round, of a bright brick-colour with distant black spots irregularly scatt- 
ered all over, the largest ones in the median part, smaller ones in the margins. 
Fig. 14. — Trevelyana marginata n. sp. Viewed from the right. X 4.5. 
Gills situated far back (at '/» of the body length from the rear end, consisting of 6 
tripinnate plumes with their axes black towards the ends. Rhinophores with pauci- 
foliate clubs; their lower half white, the upper one black with a white stripe on the 
tip. Rhinophorial and branchial openings with smooth margins. Anal tube pro- 
jecting in the middle line of the branchial circle, on its hind periphery, symmetric- 
ally flanked by the branchial plumes. Under side of the notum smooth, somewhat 
lighter than the dorsal surface, and without dots, except for some in the margins. 
Foot broad, equal in length to the notum, rounded in front. Oral tentacles forming 
a sort of oral veil, narrowly expanded at the sides of the oral pore. Dimensions: 
Length 8, breadth 4, height 3 mm. Locality: 45 miles W. S. W., 72 feet ("/7), 2 sps. 
Up to the present no classification of the comprehensive genus Doridopsis has 
been attempted, for which reason there are great difficulties in identifying the species 
belonging to this genus. ErrtoTt (1906) ineludes in it 66 species, to which BERGH (1907) 
has added 3, and VAYSSIÉRE (1912) also 3 new ones. In the literature accessible to 
me I have met with no form similar to the present one, which presents a very cha- 
racteristic colour, constant in both the specimens taken. 
Trevelyana marginata n. sp. (figs. 14, 15). Body limaciform, somewhat com- 
pressed from the sides, highest in the middle, slightly and convexly sloping towards 
the ends. Back rounded (from side to side), somewhat pustulate and rugose, di- 
vided from the sides of the body by a low list running forwards and joining the 
