252 



NEW YORK STATE MUSEUM 



margin oval; ventral margin sloping inward toward the posterior 

 end; muscle impressions deep, anterior adductor muscle scar-pitted; 



cardinal teeth large and heavy; laterals 

 strong and straight or nearly so, with 

 deep, wide impressions; beaks large and 

 '^ prominent, showing no sculpture. 



Locality. From excavations in Pros- 



/ pect park. 



duadrula coccinea (Conrad) Simpson 

 1900 (Fig. 190). Unio cocci neus 

 Conrad (1836. Monograph, 3:29) 

 Quadrula coccinea Simpson 

 (1900. U. S. nat. iJiiis. Proc. 22:788) 



Shell quadrate, oval, thick and heavy, somewhat compressed pos- 

 teriorly; anterior end oval; posterior end produced, angulated; dor- 

 sal margin oval; ventral margin rounded anteriorly, produced and 

 pointed at the posterior end; the anterior adductor muscle impres- 

 sion deep, pitted above, triangular, showing radiating lines; pos- 



1^, 



Fig. 189 Quadrula solida 



"^^^ 



'^-■f- 



\ 



/m 



Fig. 190 Quadrula coccinea 



terior adductor impression somewhat indistinct ; cardinal teeth large 

 and strong, double in each valve; laterals strong, blade-like, two 

 in the left valve and one in the -right ; beaks large, produced, show- 

 ing no sculpture, and widely incurving; dorsal margin excavated at 

 the umbones; surface marked by heavy, regular growth lines, re- 

 sembling concentric waves. 



Locality. Found in nearly all the deposits. 



