GUELPH FAUNA IN THE STATE OF NEW YORK 107 



Niagaran dolomites at Fond du Lac Wis., and it is evidently closely related 

 to L. scalar is Jones of the upper or Manlius waterlimes at Buffalo and 

 elsewhere in Western New York. 



Leperditia sp. ? 



Another large species of this genus is present in the Rochester fauna, 

 but the examples observed are insufficient for its determination. It has 

 narrower and more elliptic valves, rounded extremities and a curving hinge 

 line. It may eventually prove to be the L. phaseolus Hisinger, var. 

 g u e 1 p h i c a Jones. 



A small Leperditia has been also noticed in the Lower Shelby dolomite. 



TBILOBITA 



calymmene Brongniart. 1822 

 Calymmene niagarensis Hall 



Plate 21, fig. 12 



Calymene niagarensis Hall, Geology of New York; Rep't on Fourth Dist. 



1843. p. 182, fig. 3 (p. 101) 

 Calymene blumenbachii var. niagarensis Hall, Paleontology of New 



York. 1852. 2:307, pi. 67, fig. 11, 12 

 Calymene blumenbachii Whiteaves, Paleozoic Fossils. 1895. v. 3, pt 2, 



p. 107 



The material of the Arey collection contains a few separated parts of 

 this species, all of the usual small size prevalent in the Rochester shales of 

 New York, the outcrops at Waldron and quite generally diffused in upper 

 Siluric strata. In the upper layers at Shelby all the specimens observed 

 attain much larger size than these. 



Dr Whiteaves reports the species as occurring in the Guelph at Gait. 

 It is also reported by Whitfield from Cedarville O., but does not seem to 

 occur in the Guelph of Wisconsin. 



