OP THE GKM B I MO. c J69 



beyond the margin, marly terminal, decorticated — ligament 

 partly concealed by the beaks — epidermis reddish-brown, 

 smooth — surface somewhal wrinkled — cardinal tooth 'thick, 

 elevated, compressed at top, crenulated; direction same as la- 

 teral tooth — lateral tooth long, thick and slightly curved, ab- 

 rupt — posterior cicatrices distinct, as are also the anterior ones 

 — cavity of the beaks small — nacre pearly-white, silvery ami 

 iridescent in the posterior margin. 



far. a — red inside, rare. 



Cabinet of th>- Academy of Natural Sciences. 

 My Cabinet 



Remarks. — The ellipsis approaches somewhat to a variety ol 

 the mytiloides of Rafinesque, but is more swollen ami ponde- 

 rous, and differs in always having an elliptical margin. 



5. Unio Irroratus. Plate V. fie;, o 



^ - 



Test<i maquilaterali, &ub-orbiculata, longitvdinali, tvbercviata, rug 

 UmgitvuHnaliter tmisulcatd ; detite laterali dbrupU terwmanU. 



Shell inequilateral] suborbicular, longitudinal, tuberculated, wrinkled, 

 longitudinally sulcated ; termination of lateral tooth abrupt. 



I lab. Ohio. T. Bakewell. 



My Cabinet 

 Cabinet ofT. G. Lea. 

 ( !abine1 of Prof. Vanuzem. 

 Cabinet of the Academy of Natural Sciences. 

 Mr Nicklin's Cabin- 1. 

 Diam. hi. Length 1*8, Breadth 1*6 inches. 



Shell extremely thick and swollen — marly round, slightly 

 elongated — substance of the shell thick and ponderous — beaks 

 somewhat elevated and recurved, decorticated — dorsal mar- 

 gin rounded^ posterior, posterior dorsal and posterior basal 

 margins rounded; basil margin slightl] emarginate; anterioi 

 \ oi.. in. — :3 y 



