Welter — Kinderhook Faunal Studies. 47 



contluent at the margins. These impressions seem to agree 

 in all essential respects with the similar ones called Spirophy- 

 ton which were described by Hall * from the Devonian strata 

 of New York and interpreted by him as fucoid impressions. 

 Recently some similar forms have been described from the 

 Devonian strata of Iowa and Illinois by Udden,t with the 

 suggestion that possibly they may be the coprolites of some 

 mud-burrowing animal with habits similar to some of the liv- 

 ing Holothuroidea. Whatever may have been the source of 

 these impressions, whether they be f ucoids or coprolites, they 

 are all apparently similar and may be referred to by the 

 generic name 8pirophi/ton, although it would seem that they 

 scarcely present characters sufficient for specific distinctions. 



Correlation. 



A critical examination of the Northview fauna, gives us the 

 following twenty-four species which, with a reasonable degree 

 of certainty, are identified with species known from other 

 localities. 



Orthoiheles chemungensis. Palaeoneilo constricta? 



Scliizophoria siuallovi. Palaeoneilo truncata. 

 Rhipidomella burling tonensis. Schizodus aequalis. 



Chonetes illinoisensis. Ehjmella missouriensis . 



Chonetes cf . tumidus. Promacrus cuneatus. 



Productella concentrica. Sanguinolites ivebsterensis . 



Spirifer marionensis. Edmondia burling tonensis. 



Syringothyris carteri. Tropidodiscus cyrtolites. 



AtJiyris lamellosa. PJianerotinus paradoxus . 



Crenipecten winchelli. Porcellia cf . rectinoda. 



Pernopecten cooperensis. OrtJioceras chemungensis. 



Cardiopsis radiata. Tribloceras digonum. 



Of the species in this list fifteen, or 62^%, are known to 

 occur in the Kinderhook faunas at various localities in Mis- 

 souri, Illinois, and Iowa, as seen in the following table. Ten 



* N. Y. State Cab. Nat. Hist. 16, appendix D. 76-83. 

 t Jour. Geol.6«: 193. (1898). 



