Class VI. ASCIDIA. . 99 



GENUS XXII. ASCIDIA. 



Body fixed to a shell, rock, &c. forming a 



sheath. 

 Apertures two, one on the summit, the other 



lower. 



Asc. rustica? Br. Zool. iv. 48. 1- Ebora- 



censis. 

 Scarborough. 



Asb. with scabrous extremities ; one end bend- 

 ing upwards ; middle part smooth ; lower flat ; 

 of a brown color. 



Taken off Scarborough. Tab. xxv. Jig. 3. 



Asc. subovalis, depressa, losvis, virescens, interaneis purpureo- 2. Vires- 



fuscis, orificiis lutescentibus. M.S. H. Davies. cens. 



Green. 



* Asc. gelatinous, diaphanous, closely adhering 

 to the inside of dead oyster-shells. 



The length from one to two inches ; breadth 

 from one half to one inch. The upper aperture 

 is surrounded by eight crimson spots, the lower 

 by six only. 



Taken by dredging in the Menai, on the 

 coast of Anglesey, in the year 1 800. 



h 2 



