134 PAPEItS, ETC. 



ancl nitidus. Conovulus denticulatus, var. myosotis, is 

 confined to tlie Avon below Bristol ; and Rissoa subum- 

 bilicata and ventrosa are only to be met with in the salt 

 marshes. 



The waters of the Bristol Channel have their saltness 

 so much diluted by the influs of rivers, and so strongly 

 impregnated with mud, that but few marine mollusca would 

 desire to take up their abode in them. If ever a catalogue 

 of the marine species is prepared it niiist be after the inves- 

 tigation of the lower part of the Channel. In the more 

 northern portion we have only met with about fifteen 

 species on tlie shore, and there is nothing to induce a 

 naturalist to incur the expence of dredging. 



It only remains that we should thank those gentlemen 

 who have given us assistance in the preparation of this 

 paper, and to express a hope that any naturalist who may 

 be able to contribute materials towards a future Supple- 

 ment, should such be ever needed, will kindly communicate 

 with US. 



Class ACEPHALA. 



Div. LAMELLIBRANCHIA TA. 



Farn. CYCLADID^. 



Genus Ctclas. Bruguiere. 



C. Cornea, Linna?us. Tellina Cornea, Mat. and Eack.^ 

 Trans. Linn. Soc, vol. viii., p. 59. Abundant. The var. 

 ß of Jenyns^ monograph (Teilina stagnicola of Sheppard) 

 is to be met with in the rhines of the A-alley between 

 Portishead and Clevedon. 



C. calyculata, Draparnaud. Teilina lacustris, ^lat. and 



