202 VENUS. VENUS-SHELL. Class VI. 



3. lactea. Lin. Tt. viii. 79- Mont. Test. Br. Sup. 46. 



*_V. with a somewhat heart-shaped compressed 

 shell ; ridges concentric, strong, obtuse ; blunt 

 at one end ; diameter an inch and a half. 

 Western coast. 



4. casina. Gm. Lin. 326g. Mont. Test. Br. Sup. 



Lin. Tr. viii. 79. /. Q.f. 1. V. erycina. Br. Zool. iv. 94. 



* V. shell with transverse reclining bent edged 

 ridges ; hind margin crenulated ; strong ; white, 

 with stripes of reddish brown from the beak to 

 the margin; circumference about five or six 

 inches. Tab. lvii. Jig. 2. 



Found in the Menai, between Caernarvon- 

 shire and Anglesey. 



5. laminosa. V. cancellata. Gm. Lin. 3270. Mont. Test. Br. Sup. 38 



* V. with an ovate shell ; ridges numerous, 

 concentric, sub-membranaceous, nearly erect; 

 with an heart-shaped depression, of the color of 

 the shell, near the hinge; length one incli, 

 breadth an inch and a quarter. 



Isle of May, in the Frith of Forth. 



