VENUS. 117 



V. VERRUCOSA, Linnseus. 

 V. verrucosa, Brit. Moll. i. p. 401, pi. 24. f. 3. 



We have seen the animal alive at Exmouth, but have 

 mislaid our notes. 



V. CASINA, Linnseus. 



V. casina, Brit. Moll. i. p. 405, pi. 24. f. 1, 5, 6. 

 We have not seen this species. 



Section II. Four teeth in one valve and three in the other, with a pit to 



receive the isolated one. 



V. CHIONE, Linn, et nobis. 



Cytherea Chione, Lamarck et nonnull. 



, Brit. Moll. i. p. 396, pi. 27. and (animal) pi. L. f. 8. 



We can at present only refer to our preliminary remarks, 

 and state, that this species will not be found to differ from our 

 Veueridan descriptions, except in minor points. 



V. EXOLETA, Linn, et nobis. 



Artemis exoleta, Poli et nonnull. 



-, Brit. Moll. i. p. 428, pi. 28. f. 3, 4. 



Shell suborbicular, very convexly lentiform, having the 

 striae of increase close-set, concentric, flattened, slightly re- 

 flexed, and under a powerful lens finely striated in a vertical 

 direction, the surface being often marked with pencils of red, 

 bistre, and dark purple, which radiate from the beaks to the 

 ventral range; some specimens are milk-white, and others 

 with irregular blotches, which sometimes simulate a sort of 

 Arabic characters. There are three teeth in the left valve 

 and four in the other. The margins of the shell are smooth. 

 Animal. General colour pale yellow-white; mantle open 

 from the anterior depression to the siphons ; the margins are 

 fringed with close white cilia, which are most distinct anteally, 

 but as they approach the posterior end become less pronounced, 

 and are resolved into dentations. The siphons are short, 

 scarcely protruding beyond the shell; some authors say,, 

 " siphonal tubes long." We think this is an error ; they arc 



