ASCIDIOIDA. 471 



L. assimilis, Hassall. 

 On dead valves of Pecten ntuxiinus. 

 Dublin Bay, Dr. Hassall. 



L. Hassallii, Johnston. 

 Dublin Bay, Dr. Hassall. 



L. coccinea, Johnst. 



This species first occurred to me of a snow-white colour, on the bark of 

 a tree washed ashore at Bangor (Down) in January, 1834. On stones and 

 shells dredged in deep water on the North-East coast, it was of the ordi- 

 nary pale-reddish purple hue. 



L. simplex, Johnst. 



I find this very fine and well-marked species on old bivalve shells, 

 3Iodiola vulgaris, Pecten opercularis, &c., dredged on the same occasion 

 as Alecto major. 



L. vetitricosa, Hassall. 

 Dublin Bay, Dr. Hassall. 



i. Ilyiidmanni, Johnst. ? 



As last. Marked with doubt on account of the specimens being much 

 worn. 

 Found with L. simplex in deep water oft" the Copeland Isles. 



L. oralis, Hass. 

 Feb., 1848. — Adherent to Cellepora cervicornis growing on a stone 

 dredged off" the Whitehead entrance to Belfast Bay. in 40 fathoms water. 

 Dr. Hassall considers it a very rare species, and obtained but one Irish 

 specimen at Kingstown. I have but to add that my specimen is of a 

 beautiful silvery-Avhite hue, and most thin and delicate texture, that the 

 frotit portion of the aperture* rises up into a short process, usually bifur- 

 cate, and that from its hinder (distal. Dr. J.) spring iwo or three very long 

 and delicate spines. See Johnston, j). 308. Johnston's fig. 1, pi. 56, re- 

 presents my specimen well, but in it the spines are longer and more 

 delicate, terminating in a sharp point. 



L. linearis, Hassall. 

 Giant's Causeway and Kingstown Harbour, Dr. Hassall. Beaufort's 

 Dyke, Capt. Beechy. 



Z. aiiriculata, Hassall. 

 Bray, Dr. Hassall. 



L. punctata, Hassall. 

 Ireland, Dr. Hassall. 



i. bifuris, Johnst. 



Adherent to stone dredged in 40 fiithoms, Feb., 1848, off AVhitehead, 

 Co. Antrim, on which a broken piece of Cellepora cervicor^iis grows. See 

 specimen on base of stone touching largest specimen, Tubulipora obelia. 



* " Upper lip," Johnst. 



