40 ASCIDIADiE. 



10. 0. GRossuLARiA, Vail Beiiedeii, (Sp.) 



Ascidia grossularia, Van Beneden, M^ra. Acad. Roy. Belg. t. xx. (1847) p. 61, 

 pi. 4, f. 7-11. 



Body oval, depressed, often lenticular, sessile, and attached by 

 the entire lower surface ; outer tunic corneous, smooth, rose-red ; 

 apertures sessile. Forming disks about a quarter of an inch 

 across. Very common on oysters everywhere, and on stones at 

 low water. Usually regarded in this country as the fry of G. 

 rustica, but probably distinct. Professor Van Beneden states 

 that the branchial sac is without folds. 



11. C. AMPULLA, Brugiere, (Sp.) 



Baster, Opusc. p. 84, t. 10, f. 5, a, b, c, d. (cop. in Encyc. Meth. pi. 63, f. 13.) 

 Ascidia ampulla, Lamarck, An. sans Vert. vol. iii. (in 2nd ed. p. 528.) 



Body more or less ovate or globular, unattached ; outer tunic 

 hairy; orifices tubular, produced, placed close together, yellowish, 

 speckled with red. About an inch in length. 



" Common at Cullercoats, Northumberland ; brought in on 

 fishermen's lines. Unattached, and sometimes covered with sand 

 to the depth of half an inch," Mr. Alder. 



12. 0. MAMMiLLARis, Pallas, (Sp.) 



Ascidia mammillaiis, Pallas, Sp. Zool. fasc. 10, p. 24, t. 1, f. 15, (copied in 

 Encyc. Meth. f. 62, f. 1.) 



Body oblong, depressed, sessile, attached throughout its length, 

 rugose, gibbous ; the outer tunic coriaceous, clothed with soft 

 hairs ; colour dirty white or pale yellow ; orifices nearly sessile, 

 approximate, scarlet within. About an inch in length. Very 

 irritable. 



'' On submarine rocks in Cornwall," Gaertner. This species 

 requires to be sought for and re-observed. 



