42 CATALOGUE OF THE M0LLU8CA 



In crevices of the cliff a little above high-water mark at the 

 south end of South Shields sands (the variety), rare. — A. H. 

 "Whitburn. — Eev. G. C. Abbes. 



2. C. BIDENTATUS, Mout. 



Conovulus bidentatus, Gray, Turt. Man. 227, t. 12, f. 145. 

 In sand at Tynemouth, rare. — /. A. We have not met with 

 this species alive, but it will most likely be found to inhabit the 

 crevices of rocks near high-water mark. 



Family. Limn^id^, Jeffreys. , 

 38. LIMN.ffiA, Lamarck. 



1. L. sTAGNALis, Linn. 



Limnceus stagnalis, Gray, Turt. Man. 236, t. 9, f. 104. 

 In ponds at Prestwick Car. It occurs in a pond in Mr. 

 Sewell's grounds, Heaton Dean, but may possibly have been in- 

 troduced. — A. n. 



2. L. PALUSTRis, Linn. 



Limnceus pidustr is, Gray, Turt. Man. 239, t. 9, f 107. 



In ditches and marshes, not uncommon. 



In Prestwick Car, and in other marshes and still waters, they 

 grow to a large size, but at the margins of rivers they are very 

 much stunted in growth, and have the aspect of a distinct spe- 

 cies. On the shores of the Tyne, where they are abundant, they 

 are not larger than the common-sized L. truncatula, and might be 

 taken for that species, but for the less ventricose whorls, and that 

 the latter species is also found in the same situations in an equally 

 dwarfed condition. 



3. L. TRUNCATULA, Miill. 



Limneus minutiis, Drap. Hist. Moll. 53, t. 3, f. 5, 6, 7. 

 Limnceus truncatulus, Gray, Turt. Man. 240, t. 9, f 108. 

 In ditches, common. 



The variety y of Draparnaud, found at the margins of rivers, 

 has a very delicate and beautiful shell. The curious monstro- 

 sity mentioned by Dr. Turton, with the spire completely sunk 

 into the body whorl, was found by us some years ago in Elswick 

 Lane, and presented to Dr. Turton, who omitted to mention the 

 locality. 



