34 



wrinkled, with some transversal blackish, inter- 

 rupted bands ; nacre bluish white. Length 

 diam. axis of the breadth. 



Found in the Kentucky and Ohio; breadth 

 about two inches -,/ossule visible ; lamellar tooth 

 slightly rugose, thick, carinated ; apices not pro- 

 minent. 



SPECIES XXII. Obliquaria depressa (Unio 

 depressa.) 



Shell oval-triangular, thick and much depress- 

 ed; epidermis wrinkled, olive-brown, with oblique 

 linear scattered black points ; nacre bluish ; 

 somewhat truncated posteriorly. Length f 

 diam. f axis ^ of the breadth. 



This species is very rare. I have seen only one 

 at Evamville, (Ind.) and deposited the only spe- 

 cimen I possessed in the museum of Mr. J. D. 

 Clifford of Lexington, (Ky.) with my other spe- 

 cies. This shell is almost flat ; breadth one and 

 an half inch ^fossule visible ; teeth striated; the 

 lamellar tooth carinated and sharp ; it resembles 

 the sub-genus Scalenaria. 



