724 
Proceedings of the Royal Society 
Branchial sac delicate. Internal longitudinal bars narrow but 
distinct, undulating, supported by broad horizontal membranes, pro- 
vided with triangular flaps, to which they are attached. No 
papillae. Stigmata longish, elliptical ; about three in a mesh. 
Dorsal lamina reduced to languets. 
Tentacles filiform, few and distant. 
Olfactory tubercle irregularly oval-shaped. 
Viscera prolonged posteriorly to the branchial sac, and extending 
into the posterior narrow part of the body. 
One colony (several individuals) from Banda ; 1 7 fathoms. 
Ecteinascidia turbinata , n. sp. 
External appearance. — Many individuals united by a delicate 
much-branched stolon. Shape elongated, sometimes almost pyriform ; 
anterior three-fourths of much the same width, posterior end nar- 
rowing rapidly to a short slender stalk continuous with the stolon. 
Both apertures on the right side of the anterior end, sessile. Surface 
smooth. Colour light yellowish-brown. Length, 3 cm.; breadth, 
1 cm. 
.Test thin and membranous, transparent. 
Mantle thin. 
Branchial sac simple. Internal longitudinal bars narrow, but 
well marked. No papillse. Stigmata elliptical, rather long. 
Dorsal lamina reduced to languets, small and rather distant. 
Tentacles filiform ; of three lengths, placed alternately, about 
twenty of the long and medium sizes and forty of the short. They 
are placed thus : — long, short, medium, short, long, &c. 
Olfactory tubercle elongated posteriorly, so as to be carrot- 
shaped. 
Viscera extending slightly beyond the branchial sac posteriorly. 
One large colony from Bermuda. Shallow water. 
Clavelina oblonga , n. sp. 
External appearance. — Individuals closely united by their posterior 
extremities, which form thick irregular stolons. Shape irregularly 
oblong, or sometimes club-shaped ; anterior end wide and rounded ; 
