COSCEY LI A— DITHYRA. 26. 



t!it> iusitle from pale yellow to the richest purple; hinge with a sin- 

 gle cloven tooth in one valve, and a cavity on each side for the 

 rec >ption of the two teeth of the opposite valve. 



Montagu considered this shell to be the young of the Solen 

 vespertiuus, probably from not having met with the latter in its 

 various stages of growth. We have a complete series of the Soleu 

 vespertinus, from less than a quarter of an inch to two and a half 

 in breadth, and are satisfied that this is very distinct, as may be 

 •seen by comparing the figure above quoted, with the figure 10, of 

 the same plate. 



The Solen vespertinus, when of the same size is flatter, more 

 angular at the anterior end, of a jjaler color both inside and out- 

 side, with the rays of a pale violet : in the hinge are also two 

 teeth i.i e.ch valve, one of them rather oblique and laminar; the 

 transverse stria? are stronger, with only a few very indistinct longi- 

 tudinal ones at one end in full grown shells. 



P.SAMMOEIA testa ovato-oblongd, strus transversis longitudinalibusque costulata. 



minimis, latere untico costulis ohliquis longitudinulibus. 

 Shell oval-oblong, with transverse strite and minute longitudinal 



ones, and oblique longitudinal ribs at the anterior end. 

 Tab. nost. 6, g. 8. 

 Mus. nost. Dredged in Torbay, and the Channel. 



Shell about half an inch long, and an inch broad, thin, .slightly 

 angular at the anterior end where there are about twelve fine 

 ol)lique longitudinal ribs radiating from the hinge ; finely striate 



