86 
Proceedings of the Royal Society 
Culeolus perlucidum, n. sp. 
External appearance. — Shape of body ovate, the anterior end 
being narrow, while the posterior is round but not very broad ; 
dorsal edge slightly, and ventral edge extremely convex. Stalk long 
and thin, attached to the anterior end, which tapers into it, turned 
'away from the branchial aperture. Branchial aperture on the dorsal 
edge about one-fourtli of the way down from the stalk ; atrial at the 
dorsal edge of the posterior end, directed dorsally and posteriorly ; 
both apertures prominent. Surface even and nearly smooth, being 
slightly granulated here and there. Colour light grey. Length 
of body, 2 cm. ; breadth, 1 - 4 cm. ; length of stalk about 1 1 cm. 
Test very thin but tough, quite transparent. 
Mantle thin, not adhering to the test, musculature fine but 
irregular. 
Branchial sac very delicate. Transverse vessels wide and narrow 
alternately. Meshes nearly square. Spicules minute and very 
few. 
Dorsal lamina. — Languets rather close and wide, tapering to a 
point. 
Tentacles numerous ; a few rather large, much branched, and a 
considerable number of small intermediate ones of different sizes. 
Viscera. — One large genital gland on each side. 
Several specimens from Station 147 (between Cape of Good 
Hope and Kerguelen Island), 1600 fathoms. 
Culeolus sulimi , n. sp. 
External appearance. — Shape of body between ovate and wedge- 
shaped ; anterior end narrow, posterior end wide ; ventral edge 
nearly straight, dorsal edge strongly convex. Stalk attached a little 
on the ventral side of the anterior end and turned towards the 
branchial aperture, of moderate length, thin. Branchial aperture 
prominent, terminal, and medium ; atrial, on the dorsal edge, fully 
two-thirds of the way down, directed dorsally and slightly pos- 
teriorly. Surface even, granulated all over, and having a band of 
close-set projections cutting off a third of the body posteriorly 
and dorsally, being directed obliquely from about half-way down 
