182 TELLINA. BENT-WEDGE. Class VI. 



]3, CRASSA. Venus crassa. Gm. Lin. Lin. Tr. viii. 55. 



fi<^t- 3288. Mont. Test. Br. 65. 



T. with very thick, broad, and depressed 

 shells, marked with numerous concentric strics. 

 Breadth, an inch and three quarters ; length, 

 an inch and a quarter. 



Has the habit of the Venus borealis ; but the 

 sides of this are unequal, one being more ex- 

 tended than the other. Tab. li. Jig. 1. 



16. LACTEA. Gr,i. Lin. 3240. Mont. Test. Br. 70. t. 2. 



Lin. Tr. viii. 56. /. 4. 



* T. with an orbicular, gibbous, white, pellu- 

 cid smooth shell ; diameter three quarters of 

 an inch. This is distinguished at once by a 

 deep groove that runs fr6m the beak by the 

 side of the teeth in each valve. 



Found on the coast of Lli/n in Caernar- 

 "xioiuhire. and in various parts, but not com- 

 mon. 



17. ROTTJK-- Lin. Tr. viii. 56. Mont. Teit. Br. 7I. t. 2. 



DATA. 



/. 3. 



* T. with a shell rather convex, orbicular, hav- 

 ing two teeth in each valve, one of them forked, 



