392 On the Genus Tellinomya, and allied Genera. ^ 



between the larger one and the hinge line ; pallial impression, 



simple. 



In the larger species known the hinge line is only slightly 

 arcuate, while among the other species we find many variations 



Fig. 4. 



Fig. 1. 



Fig. 5. 



Fig. 2. 



Fig. 6. 



Fig. 3. Fig. T. 



Figs. 1, 2, 3. — TelUnomya nasuta. 

 Figs. 4 and 5. — TelUnomya diihia. 

 Figs. 6 and Y. — TelUnomya cuncata* 



in the curvature, and it sometimes becomes distinctly angular, as 

 in T. cuneata. In some species the teeth on either side of the 

 beak curve outwards from it, and in others inwards towards the 



* The specimens above figured were collected at Pauquette's Rapids, on 

 the Ottawa River, in beds lying at the junction of the Trenton and Black 



"F B 

 Eiver limestones. 



