NO. l8.] TRIASSIC FISHES OF CONNECTICUT. 73 



Family EUGNATHID^. 



Trunk fusiform or elongate, not much laterally compressed. 

 Cranial and facial bones moderately robust, externally enameled, 

 and opercular apparatus complete ; gape of mouth wide, snout 

 produced, marginal teeth conical and larger than the inner teeth. 

 Fin-rays robust, articulated, and distally divided; fulcra con- 

 spicuous. Dorsal fin short and acuminate. Scales rhombic, 

 sometimes with rounded posterior angles. 



Genus Ptycholepis Agassiz. 



Trunk elegantly fusiform; snout acutely pointed and promi- 

 nent; external bones highly ornamented with prominent waved 

 ridges ; marginal teeth very small and regular ; dorsal fin in 

 advance of anal, caudal fin forked ; scales all narrow and elongate, 

 marked with deep longitudinal grooves. Fulcra biserial, con- 

 spicuous on all the fins excepting the dorsal. 



Ptycholepis marshi Newberry. 

 (Plates VII, VIII.) 



1878. Ptycholepis marshi J. S. Newberry, Ann. N. Y. Acad. 



Sci., i, p. 127. 

 1888. Ptycholepis marshi J. S. Newberry, Monogr. U. S. 



Geol. Surv., xiv, p. 66, pi. 19, figs. 1, 2. 

 1895. Ptycholepis marshi A. S. Woodward, Cat. Foss. 



Fishes Brit. Mus., pt. 3, p. 324. 

 1905. Ptycholepis marshi C. R. Eastman, Ann. Rept. N. J. 



Geol. Surv. for 1904, p. 100. 

 1908. Ptycholepis marshi L. Hussakof, Bull. Am. Mus. Nat. 



Hist., xxv, p. 95. 



A species of slender proportions, attaining a length of about 

 20 cm. Head with opercular apparatus occupying somewhat 

 more than one-fourth the total length of the fish. Ornamental 

 rugse of cranial roof slightly radiating; those of the facial and 

 opercular plates more or less parallel and forked. Dorsal fin 

 far forwards, and pelvic fins arising opposite its hinder extremity. 

 Scales exhibiting only longitudinal ridges and furrows, and the 

 hinder border often deeply serrated. (Woodward.) 



