ASCIDIA AMiEXA. 117 



numerous, long, and slender, Branchial *<> minutely 

 laminated, with broad, stout, conical papillae at the 

 intersections of the meshes, and smaller intermediate 

 papillae. Oral lamina with the right side ribbed, and 

 lobed or widened over the mouth. 



Length about an inch. 



Hali. Deep water. 



ENGLAND. Sealiam Harbour, Durham (Bodge). 

 CHANNEL ISLANDS. [Guernsey] (Nornuni). 

 First record. Hancock [; coll. Gorman, 1870]. 



We have seen only two individuals of this rather 

 critical species (PI. XI, figs. 1 and 2) ; it is undoubtedly 

 closely allied to A. aculeata, from which it is chiefly 

 distinguished by the more simple character of the ex- 

 ternal tubercles (PL XVIII, fig. 2), which occasionally 

 support two papillae or spines, but usually only one, 

 while in A. aculeata. they bear several aculeations. 

 The branchial papillae, also, differ considerably in the 

 two species ; they are more pointed in A. amcena than 

 in A. aculeata; and in the former there is on either 

 side near the base a tubercular swelling ; but similar 

 swellings in the allied species are close to the apex ; 

 in the former, too, the profile view of the papillae is 

 more squat and not so decidedly fiddle-head-shaped as 

 it is in A. aculeata. The ovary is very similar in both 

 species. 



18. Ascidia plebeia Alder. 

 (PI. XI, figs. 3-5 ; PI. XVIII, fig. 3.) 



Ascidia plrlria ALDEK in Ann. Nat. Hist. (3) XI [1863], 

 p. 155 [, and Rep. Brit. Assoc. 1866 (1867), p. 207 ; 

 NORMAN in Rep. Brit, Assoc. 1868 (1869), p. 302]. 



Body oblong, slightly scabrous, attached for nearly 

 the whole length, greenish. Apertures, branchial ter- 

 minal, produced, conical ; anal about two-thirds down, 

 slightly raised; ocelli small, red. Test thin, trans- 

 parent, roughish, with small papillae and sparsely 



