OF NORTHUMBERLAND AND DURHAM. 45 



wick Car, Crag Lake, in ponds near Benwell, and at Middleton- 

 one-Row. 



Order. PECTINIBRANCHIATA, Cuvier. 

 Family. Paludinid^, Bisso. 



42. BITHINIA, Gray. 



1. B. tentaculata, Linn. 



Paludina impura, Aid. in Newc. Nat. Hist. Trans, i. 29. 

 Bithinia tentaculata, Gray, Turt. Man. 93, t. 10, f. 120. 

 In ditches and ponds, not common. Prestwick Car, and mill 

 stream in Jesmond Dean. "Abundant near Stockton." — Mr. 

 Hogg. 



Dead specimens of Paludina achatina are occasionally thrown 

 up on our shores, but as the shell is frequently brought in ballast 

 from the south of England, we attribute them to that source. 



43. VALVATA, Muller. 



1. V. piscinalis, Mi'dl. 



Valvata piscinalis, Gray, Turt. Man. 97, t. 10, f 114. 

 In ponds and slow streams, rather rare. Mill streams in Jes- 

 mond Dean. " Common in streams about Stockton." — -Mr. 

 Hogg. 



2. V, CRISTATA, Mail. 



Valvata cristata, Gray, Turt. Man. 98, t. 10, f 115. 

 In ponds at Prestwick Car, rare. 



Family . 



44. STYLIFER, Broderip. 

 1. S. TURTONi, Brod. 



Phasianella stylifera, Turt. in Zool. Journ. ii. 367, t. 13, f. 11. 

 Stylifer glohosv^, Johns, in Berw. Club Proc. i. 275. 

 On the spines of Echinus sphcera, rare. Newbiggin and 

 Cullercoats. — J. A. On an Echinus at Sunderland. — Mr. R. 

 Howse. 



We lately obtained a specimen of this species alive on the 



