92 CATALOGUE OF THE MOLLUSCA 



Family. Cycladid^, Fleming. 



103. CYCLAS, Brugui^re. 



1. C. CORNEA, Linn. 



Gydas cornea, Gray, Turt. Man. 280, t. 1, f. 2. 

 In ditches and ponds, common. 



2. C. CALYCULATA, Brap. 



Cyclas lacustris, Gray, Turt. Man. 281, t. 1, f. 3. 

 Cyclas calyculata and lacustris, Aid. in Newc. Nat. Hist. 

 Trans, i. 40, 41. 

 In ponds, not common. Carr's Hill, Newcastle Town Moor, 

 Tynemouth, &c. This may possibly be the Tellina lactistris of 

 Miiller, but as continental authors consider it distinct, we have 

 adopted Draparnaud's name. 



104. PISIDIUM, Pfeifer. 



1. P. OBTUSALE, Pfeiffer. 



Pisidium oUusale, Gray, Turt. Man. 282, t. 12, f. 149. 

 In a pond near Darlington. — Mr. W. Backhouse. 



2. P. PUSiLLUM, Titrt. 



Pisidium pusillum, Gray, Turt. Man. 283, t. 1, f. 7. 

 In ditches and ponds, frequent. 



3. P. NiTiDUM, Jenyns. 



Pisidium nitidum, Gray, Turt. Man. 283, t. 12, f 150. 

 In ponds at Prestwick Car. — A. H. Near Darlington. — Mr. 

 W. Backhouse. 



4. P. PULCHELLUM, Jeuyns. 



Pisidium pulchelhim, Gray, Turt. Man. 284, t. 12, f 152. 

 In ponds and ditches, not uncommon. Var, ^ Jen. is found 

 in ponds on Ryton Haughs. 



5. P. ciNEKEUM, Alder. 



Pisidium chiereum, Aid. in Newc. Nat. Hist. Trans, ii., 341 ; 

 Gray, Turt. Man. 286, t. 12, f 152. 

 Plentiful in a pond at the bottom of Castle Eden Dean. A 

 more ventricose variety is found in ditches near Brandling Place, 

 Newcastle. 



6. P. AMNICUM, Mull. 



Pisidium amnicnm, Gray, Turt. Man. 285, t. 1, f 5. 



