242 On the Littoral Fauna of the Anglo-Nunnan Idands. 



ASCIDIA. 



Throughout nearly the whole extent of the Banc de Violet 

 we find attached beneath the stones numerous specimens of 

 Ciona ■intestinal'is, Linn., a species abundantly distributed 

 upon all our coasts. Side by side with the type-form, I have 

 met with the two varieties canina and fasctcularis. Associ- 

 ated with these forms we often find Ascidia mentidaj Miill. ; 

 Ascidiella aspersa and A. scabr-a, Miill., are also met with on 

 the Gr^ve, but more rarely. 



An exceedingly abundant form is Cynthia rustica, Miill., 

 which covers the lower surface of certain rocks in company 

 with Halichondria panieea. Ascidia producta, Hanc, also 

 occurs sometimes adhering to the rocks. The genus Cynthia 

 is further represented in Jersey by C. granulata^ Aid., Vv^hich 

 is pretty common on the coast, and G. sulcatula. Aid., which 

 I have dredged in St. Aubin's Bay. 



Another species of Simple Ascidian which I have found in 

 very great abundance at certain stations is the Molgulan 

 rendered famous by the fine memoirs of M. de Lacaze-Duthiers, 

 who has named it Anurella roscovita. I have found it in the 

 same stations as those indicated by the learned Professor of 

 the Sorbonne, that is to say, upon the beaches covered with 

 fine sand, never completely uncovered at low water, at 

 Elizabeth Castle and at La Rocque. Anurella roscovita is 

 widely distributed upon these shores ; its tunic is covered, as 

 usual, with sand-grains and fragments of shell. The shell- 

 fragments covering my specimens from Elizabeth Castle 

 have been determined by M. Duprey, and belong to the 

 following species : — Rissoa labiosa, R. striata, R.jparva ; Ceri- 

 thium reticulatum ; Trochus sf7'iatus, T. cinerariuSj T. umhili- 

 catus 'y Littorina obtusata] Dentalium tarentinum] Astarte 

 triangularis ; Phasianella pulla ; Purpura lapillus ] Nassa 

 reticulata. 



I also collected several specimens of a small Molgula 

 attached to certain Algaj adherent to the rocks, which I refer 

 to Molgula socialis, Aid. (young form), and some examples 

 of Ctenicella Lancepdaini, Lac. Polycarpa glomerata, Aid., 

 is pretty frequent upon the stems of Laminarim, but appears 

 always to have been thrown up by the sea. 



The Social Ascidia are represented by numerous specimens 

 of Clavelina lepadiforviis, Wiegm., attached to the lower 

 surfaces of rocks, and some of Perophora Listeri, Miill., very 

 common on seaweeds. 



The Compound Ascidia are exceedingly abundant ; they 

 are, however, of forms common on the French shores of the 



