2 2 THE HABITAT OF THE EURYPTERIDA 



Northern Indiana (Schuchert 255, 467), which is in turn correlated 

 with the Lockport of New York. The latter correlation may stand, 

 but the former is not supported by palaeontological evidence. In a 

 private communication from E. M. Kindle, who has written quite 

 an extensive paper on the Stratigraphy of the Niagara of Northern 

 Indiana (139), the following comment is made in reference to the 

 statement that the Kokomo eurypterids are found in the Lockport- 

 Noblesville horizon: "This reference of course is an unfortunate error 

 and is presumably based upon a correlation of the Kokomo limestone 

 and the Noblesville limestone of Indiana which is undoubtedly errone- 

 ous. There is practically nothing in common between the faunas of 

 the Noblesville and the Kokomo. The lithology of the beds is quite 

 as unlike as their faunas so that there is absolutely no ground for 

 correlating these two distinct faunas." Since Kindle has done con- 

 siderable work in the region and made extensive collections of the 

 fossils, his statement is of importance. Palaeontologically it appears 

 that the Kokomo is surely not earlier than Salinan and is more proba- 

 bly Monroan, corresponding to one of the waterlimes in New York. 5 

 The eurypterid remains are very thin films, scarcely more than im- 

 pressions, so that scale markings often are not visible. The preser- 

 vation is not nearly so perfect as in the Bertie waterlime of New York. 

 There are at least 40 feet of limestone, characterized by thin lamina- 

 tion of bedding planes and the presence of eurypterids. Above this 

 horizon is a series of limestones, not thinly laminated, containing a 

 rather rich brachiopod fauna, but with the eurypterids the only other 

 fossils are ceratiocarids. The brachiopod fauna, so far as is possible 

 to learn from the literature, occurs at a different level from that in 

 which the merostomes are found (Foerste, 67, 6-8). Four species 

 have been reported from the merostome beds: Eurypterus ranilarva 

 CI. and R., E. (Onychopterus) kokomoensis Miller and Gurley, Eusarcus 

 newlini (Claypole) and Stylonurus (Drepanopterus) longicaudatus 

 CI. and R., giving altogether a fairly large fauna and one that is 

 sufficiently well preserved for purposes of characterization. 



Devonic. The Devonic of America shows a great decline of the 

 eurypterids, so far as we can judge from the fossil record, for, while 

 in the Siluric there had been an ever-increasing number of species 

 and of individuals, in the Devonic, on the other hand, there are no 

 representatives in the Lower and Middle, and it is not until the very 

 top of the Upper that a few stragglers are found. The first, a specifi- 



5 The brachiopods described by Foerste have a distinctly Monroan aspect. 



