98 ANNUAL REPORT OF 



it were shown that the example in question displayed characters 

 irreconcilable with the definition of C. gracilis, or differed beyond 

 the limits of individual variation from the other typical specimens 

 referred to in the original description. But neither of these 

 requisite conditions has been fulfilled, nor apparently can they 

 be, hence we may continue to regard Redfield's figured specimen 

 as one of the authentic co-types of this species. It is to be hoped 

 that its characters may be critically re-investigated, and in partic- 

 ular the details of its cranial osteology made known, since in this 

 specimen the head-structure is unusually well displayed. It is 

 observed by Newberry that "unfortunately the head bones are 

 not only generally displaced, but they are covered with a coat- 

 ing which obscures the sutures, the matrix clinging to the gran- 

 ulated surfaces of the head bones much more closely than to 

 the polished scales." 



This species occurs at Boonton and at various New England 

 localities, being especially abundant at Durham. The Connecti- 

 cut Valley material is as a rule better preserved than that of New 

 Jersey. 



Catopterus redfieldi Egerton. 



1847. Catopterus redAeldi, Sir P. Egerton, Quant. Journ. Geol. Soc, vol. Hi., 



p. 278. 

 1888. Catopterus redfieldi, J. S. Newberry, Monogr. U. S. Geol. Surv., vol. 



xiv., p. 53, pl. xv., Figs. 1-3. 

 1895. Catopterus redfieldi, A. S. Woodward, Cat. Foss. Fishes Brit. Museum, 



pt. iii., p. 3. 



"A broader species than the preceding [C. gracilis], and with 

 scales not so long in proportion to their depth." — Egerton. 



The above definition has been supplemented by a number of 

 diagnostic characters pointed out by Newberry, and incorporated 

 by him into a precise description, which has been condensed by 

 Smith Woodward as follows : 



"A comparatively robust species as large as the type. Length 

 of head with opercular apparatus not more than two-thirds as 

 great as the maximum depth of the trunk, and contained nearly 

 six times in the total length of the fish; depth of caudal pedicle 



