722 
Proceedings of the Royal Society 
and possibly Rhopalcea, as the family Clavelinid.ze, and place them 
next to the Ascidiad^e in the Ascidice simplices. 
CLAVELINID.E. 
internal longitudi- 
nal bars. 
Branchial sac having 
tudinal bars. 
Internal longitu- 
dinal bars bear- 
ing papillae. 
Rhopalcea. 
Internal lon- 
gitudinal 
bars having 
no papillae. 
I 
Ecteinasddia. 
Test very thick. Test thin, at 
least on 
thorax. 
E. crassa. 
Branchial sac 
not papil- 
lated. 
Clavelina. 
Horizontal mem- 
branes round 
branchial sac 
narrow. 
Tentacles few, 
all one length. 
E. fusca. 
Tentacles 
about 80, 
of three 
lengths. 
E. turbinata. 
C. oblongcc. 
Branchial sac 
papillated. 
Perophoru. 
Horizontal mem* 
branes round 
branchial sac 
very wide. 
C. enormis. 
Edeinciscidia , n. gen. 
External appearance. — Shape oblong, tapering posteriorly. 
Branchial sac having internal longitudinal bars, but no papillae. 
Dorsal lamina reduced to languets. 
Tentacles simple. 
Viscera extending beyond branchial sac posteriorly. 
This genus is formed for the reception of three species which 
seem to be intermediate in their characters between Ciona and 
Clavelina , and, except in one point, resemble Philippi’s Rhopalcea 
more than any hitherto described form. 
