C '^ T 



plicate ; inferior valve ventricose, its ribs acute, with arched 

 spiniforra scales; c arciinal teeth larre, curve ', laterally striat- 

 ed, Grenulate'J on the margins; lar=-e cardinal teeth in each valve 

 slightly bifid, broad; muscular impressions prominent. Length 

 one inch and an eighth." 



"The valves hrve aboiit 10 folds, and the lower valve closely 

 resembles a variety of Ostrea vir^-jnica ." (Oonrad, 1843). 



Type locality.- Cumberland Oo., ITe?^ Jersey. 



The Bowden specimens are small, of varying thiclrness, subequi- 

 lateral to decidedly inequilateral, moderately or slightly inflat- 

 ed; outline irregular, usually more or less rounde'' -triangular or 

 sxibovste; urabones lo7/, inconspicuous; eytemal surface sculptured 

 with five to nine strong radial plications, most nronouneed at 

 the ventral ma.r!~in and not extending to the umbones; concentric 

 SGiapture of irregular, more or less overla-o-Tint? lamellae, strong- 

 er on the plications and at times produoirg- on them short, broad 

 scales; when the attachment i by the urabones, i r re giO. ar , 



faint, closely? spaced coricentric growth lines visible on the um- 

 bones; inner mar -in of the valves coarsel;y crenulated by the pli- 

 cations and usually finely denticulated; interior surface of the 

 valve irregular. 



Si:::ensions .- itight valve: lat., l.": mm.; alt., 15.5 mm.; 

 diam.. , 2.8 mm. 



Hem-ar'-s .- xhe valves of a small Plicatula s.re q-^ite abimd- 



