221 

 Psammotsea. 



solenoides. . oblongo-elliptical, smooth ; base rather prominent ; 

 hinge about the middle, one tooth. . Grignon. 



Tellina. 



patellaris. . elliptical, rather compressed ; fine transverse striae ; 



hinge with two teeth. . Grignon. 

 scalaroides . . rotundato-ovate ; with transverse, fine, distant 



raised striae ; two teeth. . Grignon. 

 rostratis. . oblongo -transverse, narrow ; transversely sulcated ; 



beaked on the foreside. . Grignon. 

 zonaria. . ovate, flat ; very finely striated transversely ; brownish 



unequal zones, rather acutely angulated forwards. 

 patellaris. . approaches to T. remies, Lin.. . If inch. . Grignon. 

 scalaroides. . ovato- elliptical ; transverse striae, raised, distant, 



and regular, like the steps of a ladder. . 1| inch. . Grignon. 

 carinulata. . orbiculato-elliptical, rounded at both sides ; rather 



remote, elevated and carinated striae. 



sinuata. . ovato-elliptical, short and obtuse forward ; a depres- 

 sion on the disk rendering it sinuous ; striae transverse, 



very fine. . Grignon. 

 donacialis. . ovato-oblique, smooth ; very short on the foreside, 



scarcely inflected ; two wedge-like teeth, one grooved. . 



Grignon. 

 rostralis. . oblongo-transverse, narrow, transversely sulcated ; 



the forepart beaked, subbiangulated ; two very small teeth 



on one valve, and one on the other. . Parnes and Grignon. 

 corneola. . ovate, subpellucid, angulated forwards ; very small 



transverse striae. 

 pusilla. . ovate, pellucid, smooth, with an oblique small pit 



added to the hinge tooth. . Grignon. 

 rudis. . oblongo-ovate, transverse, rather smooth ; the foreside 



obtusely angulated. . Grignon. 



Corbis. 



lamellosa. . transversely elliptical ; cancellated, but on the pos- 

 terior part, the lamellae only dentated. . Grignon. 



petunculus. . round, ventricose ; cancellated at the back part, the 

 transverse lamellae plaited and serrated. . Granville. 



Lucina. 



mutabilis. . orbiculato- ovate, compressed radiating striae inside 

 the valve ; the teeth lost with age. Two teeth, one 

 divided, giving the appearance of three. . 3 or 4 inches. . 

 Grignon. 



concentrica. . orbicular ; rather flatly convex ; raised concentric 

 lamellae, with minute longitudinal interstitial striae, some- 

 times none. . Grignon. 



circinaria. . orbicular ; subangulate forwards ; very small trans- 

 verse striae ; hardly any lateral teeth. . Grignon. 



