DR JOHNSTON'S CATALOGUE OF BIVALVBD SHELLS. 79 



Venus caasina. Mya aronaria. 



fatciata. norweyica. Lyonna striat*, Tur- 



Gallina. ton. 



undata. Sphenia Swainsonii. 



Venerupis perforan*. Anatina pubcsccns, Turton. Amphi- 

 pullastra. desma pubesccns, Fleming. 



decussata. Amphisdesraa album, 



virginea. Solen siliqua. 



ensis. 



PYLORID*;. pellucidus. 



Corbula striata. Hiatella rugosa, 1 

 Lutraria vulgaris. arctica. 



Mya truncata. 



The following species 1 have not met with : 



Pectcn sinuosus. Holy Island, Winch. 



Mytilus edulis, var. incurvatus. Holy Island, Winch. 



Isocardia Cor. " This exceeding rare shell in the British catalogue, was 



taken by me alive in the Firth, near St Abb's Head." Laskey in 



Wern. Mem. \. 385. 



Cardium rubrum. Holy Island, W. C. Trevelyan, Esq. 

 Amphidesma convexum, Fleming. Mya dech'vis, Dittwyn. Holy Island, 



Winch. 

 Cytherea Guineensis, " Taken in deep water, off St Abb's Head, very 



rare. One specimen was taken alive." Lackey. 

 Venus subrhomboidea. Taken by Captain Laskey, off St Abb's Head, 



in deep water, very rare. 

 Pholas Dactylus. Holy Island, Winch. 



crispata. Holy Island, Winch. 

 Solen Legumen. Holy Island, Winch. 



In the preceding list I have followed the nomenclature of Dr Fleming's 

 '* British Animals," except where the contrary is specified. Of the spe- 

 cies in italics, the empty shells only have been found, but the others 

 have occurred in a living or fresh condition. Few of them seem to be 

 abundant in our bay, but their apparent scarcity may be owing to the 

 want of proper means and opportunities of ascertaining their localities, 

 for the dredge has not been used, my specimens having been picked 

 from the refuse of fishing-boats, or on the shore after storms. The Pec- 

 ten lineatus, P. spinosus, Lima fragilis, Arcafusca^ Kettia ruhra, Ana- 

 tina pubescens, Tellina crassa, Psammobia florida, Astarte compreua, 

 and Mya norvegica, are, however, considered among our rarest species 

 by collectors in general, and in that respect are the most interesting in 

 the catalogue. 



The Mussel (Mytilus edulis) is our most plentiful species, and at cer- 



1 Animal with two Urge syphonal tabes, united throughout ; a small bjr 

 anterior end. 



