No. l8.] TRIASSIC FISHES OF CONNECTICUT. 69 



Loper's Ischypterus newberryi. The peculiarity to which Mr. 

 Loper has called attention, namely, fine concentric scale-mark- 

 ings, seems to have been occasioned by some form of chemical 

 corrosion which has exposed the growth lines. A parallel in- 

 stance has already been noticed in the case of Catopterus ornatus 

 {supra, p. 55), and similar conditions are prevalent among fishes 

 of the English Chalk. The original of Mr. Loper's description 

 is of interest for showing a well preserved mandible beset with 

 numerous slender teeth, and a very strongly developed support 

 for the dorsal and anal fins. It is preserved in the Museum of 

 Wesleyan University, and was obtained by Mr. Loper from the 

 anterior shale near North Guilford, Connecticut. 



This species is not known to occur elsewhere than withiir 

 the state of Connecticut, and is especially abundant in the 

 vicinity of Durham. It is possible that the detached head figured 

 by Dr. E. Schellwien in Plate 3, Fig. 4 of his memoir above 

 cited belongs to 5". micropterus, since this is one of the few 

 species in which the cheek plates are granulated. 



Semionotus ovatus (W. C. Redfield). 



1842. PalcEoniscus ovatus W. C. Redfield, Am. Journ. Sci., 

 [i] xli, p. 26. 



1847. ( ?) Tetragonolepis Sir P. G. Egerton, Quart, Journ. 

 Geol. Soc, iii, p. 277. 



1850. Ischypterus ovatus Sir P. G. Egerton, op. cit. vi, 

 p. 10. 



1888. Palceoniscus ovatus J. H. Redfield (quoted by New- 

 berry), Monogr. U. S. Geol. Surv., xiv, p. 27. 



1888. Ischypterus ovatus J. S. Newberry, loc. cit., p. 27, 

 pi. i, fig. I. 



1903. Semionotus ovatus G. F. Eaton, Am. Journ. Sci., [4] 



XV, p. 266. 

 1905. Semionotus ovatus C. R. Eastman, Ann. Rept. N. J. 

 Geol. Surv. for 1904, p. 78, pi. 4-6. 



A large species attaining a total length of about 20 cm., with 

 trunk very much deepened midway between the head and dorsal 

 fin Scales large and thick, becoming gradually deepened toward 

 the middle of the flanks; tail strong and considerably expanded. 

 Number of dorsal and anal fin-fulcra greater than m any other 



