OF NORTHUMBERLAND AND DURHAM. 139 
wick Car, Crag Lake, in ponds near Benwell, and at Middleton- 
one-Row. 
OrpEeR. PECTINIBRANCHIATA, Cuvier. 
Faminy. PaLtupinipa, Lisso. 
42. BITHINIA, Gray. 
1. B. reytacurata, Linn. 
Paludina impura, Ald. in Newe. Nat. Hist. Trans. 1. 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.”—J/r. 
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, Miiller. 
1. V. prsctnatts, Jill. 
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.”—Wr. 
Hogg. 
2. V. ornistata, Mill. 
Valvata cristata, Gray, Turt. Man. 98, t. 10, f. 115. 
In ponds at Prestwick Car, rare. 
FAMILY 
44, STYLIFER, Broderip. 
1. S. rurtont, Brod. 
Phasianella stylifera, Turt. in Zool. Journ. ii. 367, t. 13, f. 11. 
Stylifer globosus, Johns. in Berw. Club Proc. i. 275. 
On the spines of Hchinus sphera, rare. Newbiggin and 
Cullercoats.—J. A. On an Echinus at Sunderland.—WUr. R. 
Howse. 
We lately obtained a specimen of this species alive on the 
