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CAPSA. 

 donax laevigata. — Gmehn. 

 Sowerbys Genera, No. 10, plate S. 

 These shells are rather inequilateral, having their li- 

 gament on the short side, as in the preceding genus: 

 they belong to the G. Tellinides, although without 

 lateral teeth ; they are also allied to the G. Psammo- 

 bia, and to certain Tellinae, by the similarity of the 

 cardinal teeth ; but they scarcely gape at the sides, 

 and have not the flexuous bend of the Tellens. Shell 

 transverse, equivalve, and closed. Hinge with two 

 teeth on the right valve, one inserted bifid tooth on the 

 other ; no lateral teeth : ligament external. 



Capsa laevigata Capsa Braziliensis. 



CRASSINA. 

 venus danmoniensis. — Montague. 

 Sowerbys Genera, No. 4, pi. 3, fig. 1, 2, 3. 

 This shell resembles a small Crassatella in appear- 

 ance, being thick and solid, and the valves perfectly 

 closing together in every part; but the position of the 

 ligament distinguishes it. Nor should it be confounded 

 with the G. Venus, since it has not more than two 



