252 PALEONTOLOGY OF NEW JERSEY. 



grandis Say. One form which I have under the name A, plana from rivers 

 in Western New York presents a remarkable resemblance to it, both in size 

 and outline. 



Anodonta corpulentoides. 



Plate XXXV, Fig. 1. 



Anodonta corpulentoides Lea. Proc. A. N. S., Phil., 1868, p. 164. Paraph., 1868, p. 32. 



The following is Mr. Lea's description of this shell: ''Shell smooth, 

 rotundo-elliptical, exceedingly inflated, very ventricose, obtusely angular 

 behind, rounded before; beaks submedial, flattened at the tips, but ex- 

 cessively inflated on the umbos." In his remarks on the species he says it 

 is so nearly like A, corpulenta Cooper that he has no hesitation in considering 

 that as its nearest representative. The specimens which I have seen are all 

 more or less crushed and distorted, but they preserve both valves and retain 

 much of the original shell, but little of the epidermal layer. So far as can 

 be judged of the original form of the specimens from the most perfect ones, 

 I should think the anterior portion in front of the umbos might have been 

 somewhat longer, with the extremity of the hinge-line a little more rounded 

 than specimens oiA. corpulenta which I have received from Illinois. In other 

 respects I can detect no difference whatever. The muscular scars are not 

 discernible on any of the specimens. 



