PALEONTOLOGY OF NEW YORK. 



carapace measures 36 nun. in length, inclusive of the prora, and 25 mm. 

 over the valve from one lateral margin to the other. 



Observations. Were the slender prora of this specimen broken away, Rhinocaris 

 scaphoptera might readily be taken for a species of Dithyrocaris or Tropidocaris, 

 for, although there is no hinge in the carapace, the normal curvature of the 

 shield would cause it to yield along the axial line whenever subjected to lateral 

 compression. 



Distribution. Hamilton group. In the upper shales of the group, associated 

 with Rhinocaris rolumbina, Echinocaris punctata and Elymocaris capsella: Tiche- 

 uor's Glen, Canandaigua Lake. 



