FOSSILS OF THE CAMBRIAN. 19 
This species is unlike any described that is known to me. In general 
form and surface characters it is allied to Kutorgina cingulata Billings, and is 
undoubtedly of the same genus if the shells illustrated by figs. 8 and 10, on 
page 8, of the “Paleozoic Fossils of Canada,” vol. i, are taken as types. 
The specific name is given in honor of Prof. R. P. Whitfield, the distin- 
guished paleontologist. 
Formation and locality—Cambrian. Prospect Mountain Group, beneath 
the Secret Cafion shale, on the west side of Secret Cafion, Eureka District, 
Nevada. 
Kutorgina Prospectensis, n. sp. 
Plate ix, figs. 1a, b. 
Shell rather small for a species of the genus. It is thick and black, like 
a linguloid shell. 
Ventral valve elevated, with the apex projecting over the triangular 
area and extending considerably beyond the posterior margin; owing to 
the exfoliation of the shell the extremity of the apex is unknown; the sur- 
face of the area is also unknown. Ventral valve depressed, slightly convex, 
without a mesial sinus; marginal outline subcircular, with the posterior 
margin obtusely angular at the beak; the beak is slightly depressed below 
the highest point of the shell, and apparently projects a trifle beyond the 
cardinal edge. Surface marked by strongly-defined fine concentric strie, 
ten in a distance of one millimeter, where they terminate on the posterior 
margin. 
The dorsal valve of this species is much like that of Iphidea Labrador- 
icus Billings, but it does not appear to come within the limits of that genus 
as defined by the type species. 
Formation and locality—Cambrian. In an arenaceous shale resting on 
the Prospect Mountain quartzite, summit of Prospect Mountain, Eureka 
District, Nevada. 
