406 NEW YORK STATE MUSEUM 



PLATE g 



FIG 



I, 2 These singular valves have a striking resemblance to some of 

 the clavicle-bearing genera like Ischyrina Billings and 

 Technophorus Miller, which are commonly regarded as 

 lamellibranchs. On comparison of the specimens with 

 these genera it seemed to us likely that they too were to be 

 regarded as of similar nature. Hence their appearance 

 here. We are, however, more; inclined to regard them as 

 bodies like Ribeiria and Ribeirella which Schubert and 

 Waagen (the founders of the latter genus) have shown to 

 be apodiform crustaceans [Jahrb. der k.k.geol.Reichsanst. 

 ! 9 3' 5 3 : 3 3 7 I- The valves occur in considerable numbers 

 crowded together in a dark shale at Tivingstonville, Scho- 

 harie co. N. Y., and though the parts are sometimes in appo- 

 sition, they have usually been twisted apart. Interesting is 

 the presence of two clavicles on the interior, a small one 

 directed forward (which is extremely obscure in the figures) 

 and a stronger pointing backward. It is doubtless true that 

 Technophorus is a ribeirioid crustacean and though it may 

 not be safe to positively refer the specimens here figured to 

 cither Ribeiria or Ribeirella we may provisionally denomi- 

 nate them as Ribeiria? prosseri. The specimens 

 were discovered and collected by Prof. C. S. Prosser in the 

 horizon of the Oneonta sandstone. 



Genus cabdiomobpha DeKoninck 



Cardiomorpha obliquata sp. nov. 

 3 A right valve 



Chautauqua subprovince Forestville 



4, 5 Side and cardinal views of a right valve 

 Chautauqua subprovince 



Little Canadaway creek, Lake Erie 



6 A right valve 



Chautauqua subprovince Forestville 



7 A left (?) valve, xi.5 



Chautauqua subprovince Forestville 



