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 



/ f . : ■■ ■■' tV , ( " i v deep, wide impressions; beaks large and 

 ... I \ J0. prominent, showing no sculpture. 



'§ Locality. From excavations in Pros- 



j pect park. 



'4^,. / Quadrula coccinea (Conrad) Simpson 



1900 (Fig. 190). Unio coccineus 



i ^-™_^-- > " Conrad (1836. Monograph, 3:29) 



Pig. 189 Quadruia soiida Quadrula coccinea Simpson 



(1900. U. S. nat. mus. 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- 



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 thetfight; 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. 



