ASCIDJA VITREA. 145 



We have been unable satisfactorily to ascertain the 

 species which Professor Van Beneden describes under 

 the name of Ascidia vitrea, and therefore give it a 

 place here with diffidence. It is stated by Forbes in 

 ' British Mollusca ' to have been met with in Killery 

 Bay, by Ball, Thompson, and himself, on Alcyonidium, 

 in 1840. Specimens of an Ascidian on Alcyonidium 

 gelatinosum in Mr. Thompson's collection are marked 

 with this locality and date ; but they appear to us to 

 be the young of A. sordida. The species met with at 

 Cullercoats and published under this name in Tyneside 

 Club Transactions requires ' also to be re-examined. 

 It is probably the young of Corella paraUelogramma. 



EXCLUDED SPECIES, 

 mentioned in Introduction but not given in Synonymy. 







Ascidia anceps TEMPLETON Mag. Nat. Hist, vii (1834), p. 



131. IRELAND. Carrickfergns, Belfast Lough, Antrim, 



dredged, 1811 (Templeton,). 

 A. gemina TEMPLETON Mag. Nat. Hist, vii (1834), p. 129. 



IRELAND. Strangford Lough, Down (Thompson, 1840). 

 A. papilla DALYELL Edinb. new Philos. Journ. xxvi (1839), 



p. 153. SCOTLAND (Dalyell). 

 A. rugosa COLDSTEEAM Edinb. New Pliilos. Journ. ix (1830), 



p. 249. SCOTLAND. East Lough, Tarbet, Argyllshire 



(Cold stream). 



