of Edinburgh, Session 1879-80. 
723 
Ecteinascidia must, on account of its property of forming colonies 
by gemmation, and having no papillae on its branchial sac, be 
included in the Clavelinid^e, but it differs from Clavelina in pos- 
sessing well-marked internal longitudinal bars. In this last 
character it approaches Ciona and Rhopalcea , from both of which 
it differs in the absence of papillae. 
Ecteinascidia . crassa , n. sp. 
External appearance. — Shape irregular, rudely triangular; attached 
by extended base to clump of sponge spicules. Anterior end more 
or less rounded ; sides irregular. Both apertures sessile, near or at 
anterior end. Surface rather irregular. Colour yellowish-grey. 
Length, 2 cm.; breadth along base, 3*5 cm. 
Test enormously thickened. 
Mantle strongly developed. Muscle bands thick. 
Branchial sac crumpled. Internal longitudinal bars fine, undu- 
lating, borne on large pyramidal ducts. No papillse. Stigmata 
elongated. 
Dorsal lamina languets. 
Viscera extending considerably beyond branchial sac, and forming 
a distinct abdomen. 
Two specimens attached to the spicules of a large sponge (Labaria 
hemisphcerica) from Station 192 (Ki Island) ; 129 fathoms. 
Ecteinascidia fusca , n. sp. 
External appearance. — Individuals united by a short, thick, irre- 
gular stolon, which looks merely like a continuation of their posterior 
extremities. Shape very elongated, some specimens rudely club- 
shaped; anterior* end wide, truncated; posterior half narrower, 
contorted, passing down into the stolon. Apertures nearly terminal, 
both placed on the right side of the extremity ; branchial near the 
middle ; atrial near the dorsal edge. Surface smooth but uneven, 
especially at the posterior end, where knobs and processes are 
formed. Colour dark brown. Length, 5 cm. ; breadth, 1 ’5 cm. 
Test thickish, especially on the posterior part ; vessels present. 
Mantle thin ; muscular fibres distant, but well marked, and of a 
reddish-brown colour. 
