60 NILS HJ. ODHNER, MOLLUSCA. 
account of the produced shape of these specimens, I have determined them as belonging 
to this species (SoOwERBY, Thesaurus Conch. I, Pl. XLV, fig. 127, Pl. XLIV, fig. 
77). TRYON (Manual of Conchology, Vol. 7, 1885) considers this species to be a 
variety of T. cancellata QuoY & GAIMARD, but the definitions of the species within 
this genus are too uncertain for this opinion to be justified. The shell is grayish 
violet coloured, with a brown line somewhat below the sutural band, a light band in 
the periphery. 'The aperture is light grayish brown within, recalling 7. livida REEVE. 
The ribs are straight, distant, bent to the left; and there are a few distant striae 
(only 3—4, and on the lower half of the body whorl exclusively). — Distribution: 
Moluccas, Philippines (TRYON 1885, SCHEPMAN 1913), Queensland (HEDLEY 1910), 
Maldives and Laccadives (E. A. SMITH 1903). 
T. textilis Hinps. (Pl. 2, fig. 65). 45 miles W. S. W., 70—72 feet ("/1), 2 sps, 
max. 1. 20.5 mm. They agree completely with the figures in SOWERBY (Thesaurus 
Conch. I, Pl. XLIV, fig. 73), as well as with the description given by E. A. SMITH 
1879 (Proc. Zool. Soc., p. 185). Photographs of this and the preceding species are 
reproduced here to illustrate their characteristics, which are only indistintly to be seen 
in older figures. — Distribution: Japan, Straits of Macassar, Sandwich Islands (TRYON 
1883, SCHEPMAN 1913). 
Opisthobranchia. 
1. Tectibranchia. 
Atys tortuosa ÅA. ADAmMs. 42 miles W. S. W., 66 feet ("'/1), I sp., 1. 6.5 mm. 
Though somewhat defective the specimen proves clearly to belong to this species 
as the aperture is produced above, as well as below, to form canals, especially 
inferiorly. Upper and lower ends of the shell are spirally striated and furnished with 
feeble, irregular, extremely fine, longitudinal folds, which end at the smooth (not spir- 
ally striated) median zone. The colour is a hyaline grayish white. — This species 
is mentioned by REEVE (Conch. Icon. 17, 1869, pl. III, fig. 15), from Philippines, by 
BRAZIER (1878) from Torres Strait and New Guinea, 8—30 fms (Proc. Linn. Soc. 
N. S. Wales, Vol. II, Moll. of Chevert Exped.), and by ScHEPMAN (1913) from Sunda 
Islands, 36—90 m (Siboga Exped.). 
2. Nudibranchia. 
Ceratosoma corallinum n. sp. (PI. 2, figs 66, 67; text fig. 13). Animal rather 
slender, with a far produced tail and a high body, sloping sharply towards the front. 
Dorsal surface quite flattened and smooth, sharply limited all round at the sides by 
a well defined margin. One pair of well developed, rounded lobes, thinning towards 
the edge, just behind the middle of the back. Posterior protuberance narrow ("/1« of 
the back across the lobes) and short (about !/« of the length of the back in front 
of it), distinetly set off, and broadly canaliculated beneath. Head separated from the 
