92 NEW YORK STATE MUSEOJM 



2 PHYLLOCARIDA FROM THE BLACK SHALES AT THE BASE OF 

 THE SALINA BEDS IN WESTERN NEW YORK 



PLATES 2, 3 



In the account of Pseudoniecus roosevelti given 

 aboYe, reference is made to the fact that the majority of specimens 

 representing that species are from a layer of black shale below 

 the horizon of the Salina gypsum. This tock and its most inter- 

 esting contents were first brought to view b;^ the excavations^ 

 made at the time of the deepening of the Erie canal in 1807 in the 

 townships of Pitteford and Brighton, Monroe co. and, as already 

 noted, the material was collected by C. J. Sarle of Roches- 

 ter, from whom it was secured for the state museum. The fauna 

 of this shale has been briefly mentioned as a crustacean assem- 

 blage new to the paleozoic and we have reserved to Mr Sarle, 

 the discoverer^ the privilege of giving an account of its interesting 

 eurypterid and pterygotid species. The other Crustacea of which, 

 we have here taken notice complete this crustacean component. 

 This black shale, which is highly fragile and checks rapidly on 

 drying, suggests very forcibly the black merostome-bearing shales 

 of Lesmahago, and only where it is complicated with the inter- 

 laminated thin slabs of gray dolomite does it carry any other 

 organisms save a species of L i n g u 1 a. The dolomites, how- 

 ever, contain Leperditia identical with the L. s c a 1 a r i s 

 Jones, which Grabau has identified from the upper, or bullhead, 

 dolomites lying above the upper Eurypterus beds in the Buffalo 

 section^, and a pterineoid like Pterinea, subplana Hall^. 

 of the Rochester shale. 



Ceratiocaris (Limnocaris) praecedens sp. nov. 



PLATE 3, FIGURES 5-10 



Generic characters. This large species, probably the largest 

 carapace that has been recorded among the Ceratiocaridae, has in 

 all observed respects save one, the structure normal for the genu» 

 Ceratiocaris as defined by recent authors, specially by 



^ Siluro-Devonic contact in Erie county, N. Y., Bui. geol. soc. Am. 1900^ 

 371, pi. 22, f . 6. 1 



