OF NORTHUMBERLAND AND DURHAM. 179 
2. V. casina, Linn. 
Venus casina, Mont. Test. Brit. Supp. 47. 
From deep water, rather rare. “Holy Island.’—Mr. Winch. 
Newton.—Ur. Rk. Embleton. Whitburn—Rev. G. C. Abbes. 
“ Seaton, W. C. Trevelyan, Esq.”—Hogg’s Nat. Hist. of Stockton. 
3. V. Fascrata, Da Costa. 
Venus paphia, Mont. Test. Brit. 110. 
In deep water, rather rare. 
4. V. gauuina, Linn. 
Venus striatula, Mont. Test. Brit. 113. 
Var. 1. Without rays, ridges sharper and closer. 
Venus rugosa, Penn. Brit. Zool. iv. 95, t. 56, f. 50. 
Var. 2. Shell more compressed, and produced transversely ; 
strie sharp and distant. 
Venus Prideauaxiana, Leach, Macg. Moll. Aberd. 266. 
This species is subject to very great varieties. The normal 
form, Venus gallina of authors, is plentiful on some of our sandy 
shores, living at a little distance below low-water mark. The 
first variety, Venus rugosa of Pennant, and perhaps also V. lami- 
nosa of Laskey and Montagu, is very rare on our coast and its 
habitat unknown to us. The second variety, V. Prideausxiana, 
Leach, is always found in deep water, and is not uncommon ; 
sometimes plain, but generally with about three brown rays. 
The plain kind appears to be the V. laminosa of Turton’s “ Bri- 
tish Bivalves,” and his V. pallida looks like a variety of the 
littoral form with the ridges obsolete. The V. costata of Brown 
(Illust. Rec. Conch. 90, t. 36, f. 13), “found at Seaton, Nor- 
thumberland,” we take to be a short variety of the deep-water 
form. 
5. V. ovata, Penn. 
Venus ovata, Mont. Test. Brit. 120. 
From deep water, rather rare. 
Venus triangularis of Mr. Hoge’s list is more likely Astarte 
compressa. There is also a Venus triangulus, Brown, MSS., in 
the same list, with which we are unacquainted. Mr. W. Back- 
house has suggested to us that the Venus chione of Sir C. Sharp’s 
“History of Hartlepool,” may be a variety of Cyprina Islandica, 
