152 



slightly at each side; beaks rather prominent. Hinge with two teeth on the 

 left valve, and one entering tooth in the opposite valve. 



Psammotea. Shell transverse, oval or oblong oval, gaping a little at the 

 sides; one cardinal tooth in each valve, sometimes in one valve only. 



P. 



P. violacea, 

 ' zonalis,' 



pellucida, 

 serotina, 



P. Candida, 

 ' Tarentina, 



P. donacina, 

 1 fossil species. 



NYMPHACEA TELLINARIA 



Is subdivided into — 1, Shells having one or two lateral teeth; and 2, those 

 which have no lateral teeth. 



1 . Having one or two lateral teeth. 



Tellina. Shell transverse or orbicular, in general rather flat; the ante- 

 rior side angular, with a flexuous and irregular fold on the margin; only one 

 or two cardinal teeth in the same valve; two lateral teeth, often remote. 



T. radiata, 

 unimaculata, 

 semizonalis, 

 maculosa, 

 virgata, 

 staurella, 

 crucigera, 

 Splengeri, 

 rostrata, 

 latirostra, 

 sulphurea, 

 foliacea, 

 operculata, 

 rosea, 



T. chloroleuca, 

 ' elliptica, 

 ' albinella, 

 ' margaritina, 

 ' strigosa, 

 ' planata, 

 ' punicea, 

 ' depressa, 

 ' pulchella, 

 ' fabula, 

 ' tenuis, 

 ' exilis, 

 ' donacina, 

 ' nitida, 



T. scalaris, 

 psammotella, 

 remies, 

 sulcata, 

 striatula, 

 scobinata, 

 crassa, 

 laevigata, 

 linguafelis, 

 rugosa, 

 lacunosa, 

 gargadia, 

 pristis, 

 multangfula, 



T. polygona, 

 capsoides, 

 decussata, 

 Brasiliana, 

 obliqua, 

 umbonella, 

 deltoidalis, 

 nymphalis, 

 solidula, 

 bimaculata, 

 sexradiata, 

 ostracea, 

 convexa. 



Tellinides. Shell transverse, inequilateral, rather flat, slightly gaping 

 at the sides; beaks small and rather depressed, without the irregular fold on 

 the margin. Hinge with two diverging teeth in each valve, two lateral teeth, 

 almost obsolete; the posterior of which, in one valve, is near the cardinal 

 teeth. 



T. Timorensis. 



