248 XEW YORK STATE MUSEUM 



Pisidium ultramontanum Prime 1865 (Fig. 182). P. ultra- 

 m o 11 1 a n u m Prime (1865. Smith. Misc. coll. no. 



I45> P- 75) 



Shell solid, oval or suborbicular, and remarkably 

 compressed; anterior side much produced between 

 the extremity of the lateral teeth and the junction with 

 -^-.^■' the basal margin; posterior margin well rounded; 

 Fig. 182 Pisidium beaks Small and only slightly raised above the outline 



ultramontanum. x3 ^ , , 111,1 , ' • r 1 1,1 



of the shell; the striae very hne and even, and the 

 hiiige line straight. 



Locality. Goat island. 



Pisidium scutellatum Sterki. 1896 (Fig. 183). P. s c u t e 1 1 a - 

 tum Sterki (1896. Nautilus, 10:66) ,^^^ 



Shell high, oblique, slanting downward anteriorly, 

 well rounded and rather strongly inflated; beaks pos- ^^ _,> 

 terior, rather large and prominent, margins well curved, pjg_ ^33 pjgj. 

 the surface polished, having irregular growth lines ; the ^l^^ scuteiia- 

 hinge fine and short; cardinal teeth lamellar, the one in 

 the right valve moderately curved, its posterior end being thickest; 

 the inferior in the left valve curved; the superior almost straight; 

 the lateral teeth very short, abrupt, pointed and thin, projecting 

 somewhat into the cavity of the shell. 



Locality. Goat island. 



Genus LAMPSiLis Rafinesque. 1820 



Shell inflated, rather thin, and shining, sometimes having a pos- 

 terior ridge; sculpture coarse at beaks. 



Lampsilis rectus (Lam.) Smith 1899 (Fig. 184). U n i o 







Pig. 181 Lampsilis rectus 



recta Lamarck (1819. Auiinaux sans vcrtchrcs, 6:74) L a m p - 

 s i 1 u s rectus Smith (1899. P. S. fisli com. Bui. p. 290) 



