ASCIDIA VENOSA. 103 



FORBES and HANLEY Brit. Moll. I [1848], p. 31; THOMP- 

 SON Nat. Hist. Ireland, IV [1856], p. 359; [ALDER in 

 Rep. Brit. Assoc. 1866 (1867), p. 207 ; NORMAN in Sep. 

 Brit. Assoc, 1868 (1869), p. 302]. 



.Hutli/ elongated, sub-cylindrical, rather compressed. 

 attached by the base. Aperture*, branchial terminal, 

 anal a short way down the side. Test cartilaginous, 

 semi-transparent, smooth, thickly veined with red so 

 as to appear uniformly of that colour. Mantle crimson, 

 veined. Tentacular filaments stout and longish. Bran- 

 chial sac with rather obtuse primary papilla? at the 

 junction of the bars, and without secondary papilla?. 

 [Oral lamina wide and closely ribbed.] 



Length an inch to an inch and a half. 



Hab. Below tide-marks; 40-50 fathoms in the 

 Shetlands. 



ENGLAND. Hastings, Sussex (Blackett and Bower- 



SCOTLAND. Hebrides (Forbes & Me. Andrew [ ; Alder, 

 I860] ). Isle of Sky and Shetland (Norman & Jeffreys). 

 [Middle Haaf off Out Skerries, and Haroldswick Bay, 

 Shetland Islands (Norman, 18(38).] 



IRELAND. Strangford Lough, Down, and Belfast 

 Lough, Antrim, dredged (Thompson}. Killery Bay, 

 Connemara, Galway (Thompson, Hall, and Forbes 

 [1840] ). 



First record. [" First distinguished as an Irish 

 species by Dr. J. L. Drummond ' (Thompson, 1840) ; 

 evidently the first British record.] 



This beautiful species appears to be pretty-generally 

 diffused. It has not yet been met with, however, on 

 the east coast of England. 



The soft pellucid rosy hue of the smooth test (PI. 

 VII, fig. 5) is very characteristic, and the deeper tone 

 of the blood-channels when looked at with a hand-lens 

 heightens the effect. These channels (PI. VIII) are 

 exceedingly numerous, and divide and subdivide until 

 their extremities become quite microscopic. A flat 



