Mr. Aldeu's Catalogue of Land and Fresh-water Shells. 41 



My specimens agree pretty well with Draparnaud's description, but are less oblique 

 and rather less compressed than his figures. I therefore acquiesce in Dr. Turton's 

 opinion of their identity, with some slight doubts. The species is intermediate between 

 C. cornea and C. calyculata. 



68. C. calyculata, Drap. 



C. lacustris, Turt. Biv. Brit. 

 Cardium lacustre, Mont. ? 

 In ponds ; rare. Carr-Hill, and Southwick — Mr. A. Hancock. Tyneraouth — tfte 

 Rev. W. Mark. 



69. Cfontinalis, Drap. 



C. pusilla, Turt. Biv. Brit. 

 Pera pulchella, Leach, in Brit. Museum. 

 In ponds and slow streams ; not uncommon. 



70. C.gibha. 



Pera gibba, Leach in Brit. Museum. 



Pisidium obtusale, Brown, in Edin. Journ.of Nat. and Geograph. Science, v.i. 

 p. 412. 

 In ditches and ponds ; frequent. 



This shell is distinguished from the preceding by being smaller, more obtuse at the 

 umbones, less triangular, more gibbous, and more slightly striated. The C. obtusalis of 

 Lamarck appears to be distinct from this species. 



71. C. ohliqua, Lam. 



C. palustris, Drap. 

 Cardium amnicum, Mont. 

 In streams ; rare. 



It may be proper here to mention that I have in my possession specimens of the young 

 oi Helix cingenda, Mont., given to me by my friend Mr. W. Robertson, who informs me 

 that they were coUected by him on the sea banks of Northumberland or Durham, but is 

 not sure of the exact spot: certainly at one or other of the following places, Seaton Sluice, 

 Bamborough, or Hawthorn-dean. Dead shells of Cyclostoma elegans and Neritinafluvl 

 atilis have also been found on our sea shores ; but sufficient evidence of their being native 

 has not been obtained to allow of their admission into the preceding Catalogue. 



VOL. I. 



