132 BRITISH TUNICATA. 



' Zoologia Danica' [Plate xv, f. 3], being sufficiently 

 characteristic of our animal. Continental authors, and 

 I think rightly, have considered the larger (adult) 

 form described by Miiller to be the true Ascidin ruatica. 

 Having ascertained from specimens sent to me by the 

 accomplished author, that Professor Van Beneden's 

 Ascidia grossularia is identical with our British species, 

 I do not hesitate to adopt his name. The Cynthia 

 t/titfii of Stimpson appears also to be synonymous with 

 this. The true Ascidia rustic a of Miiller has not 

 hitherto been met with in this country. 



2. [Styelopsis] sphserica sp. nov. 



Ascidia rusticajun. 0. F. MULLER Zool. Danica, I [1788], p. 

 14 (pars), pi. xv, ff. 1, 2. 



Body globose, finely corrugated transversely, 

 attached to sea- weeds by a narrow base. Apertures 

 nearly terminal, not far apart, small, smooth. Test 

 semitransparent, with fine transverse corrugations, 

 stronger and becoming somewhat puckered near the 

 apertures. -Tentacular filaments linear. Branchial sac 

 with a single distinct fold on the left side, and a very 

 slight one on the right, both situated near the oral 

 lamina, which is smooth ; the meshes longitudinal and 

 much elongated. An ovary on the left side only, lying 

 perpendicularly on the dorsal aspect. 



Diameter rather above half an inch. 



Hob. ? 



IKE LAND. Killery Bay, Gal way (Thompson}. 

 First record. Alder & Hancock ; coll. Forbes, Ball, 

 & Thompson, 1840. 



A single specimen, apparently adult, with a young- 

 one attached, is preserved in Mr. Thompson's col- 

 lection, now in the Belfast Museum. It is labelled 

 " Killery Bay, 1840," and was got during an excursion 

 of Messrs. Forbes, Ball, and Thompson to that locality ; 



