PARASCIDIA FLEMING!!. 21 



animals. Individuals (PI. LVI, fig. 5) irregularly dis- 

 posed, forming usually a single system around a central 

 orifice with an undulating or lobed margin (PI. LIV, 

 fig. !>). Branchial aperture with eight opaque yellowish- 

 white lobes. Thorax yellow, with seven or eight rows 

 of stigmata in the branchial sac. Stomach orano-e- 



o o 



coloured, plicated longitudinally. Post-abdomen rather 

 constricted at its junction with the thorax, stout, 

 fusiform, orange-yellow, tapering to a red nipple-like 

 point. 



Height of mass from a quarter to half an inch 

 (6-12 mm.). Length of individuals two-tenths of an 

 inch (5 mm.). 



Hab. On rocks and the under side of stones near 

 low water-mark. 



ENGLAND. Not uncommon on the north-east coast. 

 Tynmouth, Cullercoats, and Bambrough, Northumb. 

 (Alder). Isle of Man (Alder). 



SCOTLAND. ? Isle of May, Firth of Forth (Fleming). 



First record. ? Fleming, 1828 ; or Alder & Hancock, 

 1848. 



This Parascidia seems to take the place on the 

 north-east coast which is occupied by Amaroucium 

 proliferum on the south and west. It has some general 

 resemblance to that species, but is smaller and more 

 delicate. Like some others of the family, it is doubly 

 compound, the compound masses giving rise to others 

 by gemmation from creeping tubular processes running- 

 over the stone as in the Social Ascidians. The com- 

 mon excretory orifice can scarcely be detected after 

 the death of the animal. 



3. 



Parascidia flabellata Alder. 



Parascidia flabellata ALDER in Ann. Nat. Hist. (3) XI 

 [1863], p. 172. 



Colony elongate, tabulated, transparent, consisting 

 below of a very much-produced peduncle, which is 



