ASCIDIA. 35 



11. A. ASPERSA, Miiller. 



Zool. Dan. t. 65, f. 2. 



Body ovate, sub-compressed, adhering obliquely at base. Tunic 

 slightly scabrous, white, transparent, shewing the red spotted 

 branchial sac. Orifices papillose, nearly sessile, terminal. Gre- 

 garious, An inch in length. 



Loughs of Strangford and Belfast, W. Thompson, Ann. Nat. 

 Hist. vol. V. (1840) p. 94. 



12. A. viTREA,*Van Beneden. 



Mem. Acad. Roy, Belg. t. xx. (1847) p. 59, pi. 4, f. 1-5. 



Body globose or sub-compressed, attached by a very small base. 

 Outer tunic thin, transparent, membranous, hyaline ; tubes ter- 

 minal, placed rather apart, the branchial projecting most, but 

 both short. Orifices with red ocelli. Half an inch in length. 



On Alcyonidium in Killery Bay, (1840,) R. Ball, W. Thomp- 

 son, and E. F. Probably not uncommon on many parts of our 

 coast. 



18. A. coNCHiLEGA, 0. F. Muller. 



Zool. Dan. t. 30, 4, f, 4, 5, 6. 



" Compressed, infested with fragments of shells ; inner tunic 

 white, passing to blue." This species requires elucidation. 



" Coast of Down and Antrim," W. Thompson, in Ann. Nat. 

 Hist., 1844. 



14. A. ECHiNATA, Linnaeus. 



Zool. Dan. t. 130, f. 1. 

 Plate C, fig. 4. 



Body globose, adhering by base. Tunic tough, yellowish, 

 opaque-white, studded with conical eminences or papillae, which 

 bear upon their summits a circle of from four to seven radiating 

 bristles. Orifices sessile, tinged and rayed with deep crimson ; 

 the oral with eight, the anal with six rays or notches; the inter- 

 spaces tubercular : the branchial orifice is much the most con- 

 spicuous. About an inch in height. 



