JOURNAL OF CONCHOLOGY. 



421 



.?. puiris 



H. aspersa vars. ... 



Vit. pellucida 



Z. 7iitidus (one) ... 



//. ;7ij;«^;-«/?V (limited) 



H. ericctonun var. minor... 



H. pulchella 



B. acutus {\\vi\\\&(\) 



Coch. liibi ica 



Z. crystallinus 



Vit .pellucida 



P. iimbilicaia and var. edcntula 



Coch. lubrica 



H. ericetoniiii and var. minor , 



H. ericctorum var. alba ... 



Keel Strand, sea level. 



The Warren, 20 — 70 feet. 



1, 



nnishbiggle, 20 feet. 



Keel Common, 20 feet. 

 Dugort, 10 feet. 



NOTES ON THE VIVIPAROUS NATURE OF BALEA. 



By a. E. craven, F.L.S., and EDGAR A. SMITH, F.Z.S. 



(Read before the Concho'.ogical Society, May 6th, 1S91). 



In October, 1890, 1 found great numbers of specimens oi Balea 

 perversa (Lin.) among the ruins of Vianden Castle, in the Grand 

 Uuchy of Luxemburg. Nearly every specimen contained two 

 or three young. These were already sufficiently developed as to 

 possess about three whorls. This mollusk has, I believe, been 

 hitherto considered as laying numerous eggs, which take 

 several days to hatch ; it, therefore, seems an interesting fact to 

 note that it is ovo-viviparous. — Alfred E. Craven. 



The above is not the first record of the viviparous nature of 

 Balea perversa. It is, however, none the less important, as it 

 confirms the statement of Mr. Rich as given in Rimmer's 

 ' Land and Freshwater Shells of the British Isles,' p. 169. 



This discovery is in direct contradiction to the account 

 (the only account, I believe) of the propagauon of this species. 



