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

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



P. virgata, 



' Ferroensis, 

 ' vespertina, 

 ' florida, 

 ' maculosa, 



P. cssrulcscens, 

 ' elongata, 

 ' flavicans, 

 ' squamosa, 

 ' alba, 



P. Cayennensis, 

 ' laevigata, 

 1 tellinella, 

 ' pulchella,' 



P. aurantia, 

 ' fragilis, 

 ' livida, 

 1 galathea. 



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. violacea, 



' zonalis, 



P. pellucida, 

 ' serotina, 



P. Candida, 

 ' Tarcntina, 



P. donacina, 

 1 fossil species. 



NYMPH ACE A 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, 

 tabula, 

 tenuis, 

 exilis, 

 donacina, 

 nitida, 



P. scalaris, 

 psammotella, 

 remies, 

 sulcata, 

 striatula, 

 scobinata, 

 crassa, 

 laevigata, 

 linguafelis, 

 rugosa, 

 lacunosa, 

 gargadia, 

 pristis, 

 multangula, 



T. polygona, 

 capsoides, 

 decussata, 

 Brasiliana, 

 obliqua, 

 umbonella, 

 deltoidalis, 

 nymphalis, 

 solid ula, 

 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. 



