NORTHERN AND SOUTHERN KINDERHOOK FAUNAS 629 



22. Mytilarca occidentalis W. & W. The specimens of this species 

 in the English River fauna are similar to those of the Chono- 

 pectus fauna at Burlington. 



23. Goniophora jennae (Win.). The English River specimens of 

 this species are identical with the larger one illustrated from 

 the Chonopectus fauna at Burlington. The smaller specimens 

 from that locality should probably be separated from G. jennae 

 as a distinct species, to which the Kinderhook, Illinois, shells 

 should be referred. 



24. Macrodon cochlearis Win. This is one of the common species 

 of the fauna, and the specimens do not differ essentially from 

 the Burlington examples. 



25. Grammysia plena Hall. A single imperfect left valve of this 

 species has been observed, but its identification with the Burling- 

 ton specimens is entirely satisfactory. 



26. Sphenotus iowensis (Win.). Specimens of this species from 

 English River are similar to those from Burlington in all essential 

 characters. 



27. Sphenotus sp. undet. 



28. Murchisonia sp. undet. 



29. Naticopsis depressa Win. The "fine regular elongate nodes," 

 mentioned in the original description of this species as marking 

 the upper ends of the striae of growth, could not be detected 

 upon either of the two specimens marked as types in the Uni- 

 versity of Michigan collection, and no others from Burlington 

 have been studied by the writer. Two specimens from English 

 River, however, show this characteristic nicely, which leads to 

 the supposition that all of the type specimens used by Winchell 

 in the description of the species are not preserved in the collection 

 at Ann Arbor. 



30. Straparollus sp. undet. This is a rather common species in the 

 fauna, but it is usually not well preserved. It resembles S. 

 angularis, but does not have the angular revolving ridge of that 

 species. 



31. Bellerophon bilabiatus W. & W. This species, which is one of 

 the commonest ones in the Chonopectus fauna at Burlington, 

 is likewise a common species in the English River Grit. 



