108 



BRITISH TUXK'ATA. 



13. Ascidia inornata Hancock. 

 (PL XVII, fig. 10; and fig. 22 in text.) 



[Ascidia inornata, HANCOCK in Ann. Nat. Hist. (4) VI 

 (1870), p. 359.] 



Ikxlij elongated, oval, depressed, attached by the 

 whole side, of a watery horn-colour. Ap^rfures a little 

 produced, with longitudinal ridges or folds; the l>rau- 

 cliial sub-terminal, the anal about half way down. 

 Test rather thin, cartilaginous, transparent, with a 

 few minute papillae and some scattered agglutinated 

 particles of sand and shells, chiefly towards the border 



FIG. 22. Ascidia inornata. Natural size. 



of attachment. Mantle well supplied with interwoven 

 muscular fibres. Tentacular filaments numerous and 

 rather stout. Brandiial sac narrow, with large papilla? 

 at the intersections of the meshes, and small inter- 

 mediate ones on the longitudinal bars. Oral lamina 

 wide, strongly ribbed ; margin pectinated and bordered 

 on the left side with a band of tubercles. 



Length nearly two inches. 



Hob.? 



EXGLAND. Hastings, Sussex (Bowerbank). 

 First record. Hancock, 1870 ; coll. Bowerbank. 



We have seen only a single individual of this species, 

 and, as it had been some time in spirit before it was 

 examined, not much is known respecting its colour. 



The test (fig. 22) is thin, firm, and elastic, and of a 

 transparent watery horn-colour,, with a few very minute, 

 scattered papilla?, and here and there, spread over the 



