KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. N:o |6. 61 
back by a slight constriction, and furnished with a sharply projecting margin, form- 
ing two side lobes, separated by a slight front concavity. Colour a marbling of 
light rose and yellowish white, forming large spots or clouds. On the back, the red 
tint occupies 3 zones: the head, the middle part, and the hind part (in the latter 
the lobes on their median portion), separated by whitish transverse bands. The 
posterior projection on its upper side, expecially behind, dotted with some darker 
red points; such a marking indistinctly appearing also on its under side. Sides of 
body red-marbled above, uniformly wbhitish below, tail somewhat more vividly red 
with yellow whitish spots and 3 transverse bands of the same colour. 
Gills about 16, surrounding the anus on the sides and in front, bush-like, 
trifid, strongly expanded, with red ends and white roots. Rhinophorial pores with 
slightly elevated yellowish white marging, rhinophorial clubs rose tinted, closely lamin- 
ated. 
R 
Fig. 13. Radula of Ceratosoma corallinum n. sp. a rachis, with rudimentary 
median tooth, Db lateral tooth from outside. 
Dimensions in millimetres: Length of animal 78, 1. of body portion 44, 1. of 
tail 34, h. of the tail at the root 10.5, breadth 8, height of body at the gills 20, 
breadth of body across the lobes 17, I. of hind process 9, br. at the base 6, br. of 
head 13. 
Radula (fig. 13) 2 .1. &. The teeth agree with those of C. cornigerum (ADAMS) 
BERGH, gracillimum (SEMPER) BERGH and trilobatum (GRAY) ROCHEBRUNE, described 
and figured by BERGH in 1876, but differ from those of C. polyomma BERGH 1880 
and C. bicorne BERGH 1905, where more (3—6) denticles are present. Median tooth 
is rudimentary, and without hook, lateral teeth are very close with a sharp under- 
edge and a strongly curved hook; a very small denticle on its outer side. 
Locality: Cape Jaubert, 45 miles W. S. W., 72 feet ("/x 1911). 
The present form approaches in shape and colour C. lixi ROCHEBRUNE (1895, 
pl. 6, fig. 61), from Dead Island, Torres Strait, but the latter has numerous small 
red dots scattered over the uniformly rose-tinted body and a blue marginal line. 
Further it differs in having a narrower tail, a concave front margin of the head, 
and stronger side-lobes. As a consequence of these differences, I consider it a distinct 
