ACTINOPTERI. 159 



Sphyrsna Morton, Synop. Organ. Rem. Cret., 1834, p. 32, PI. 12, fig. 1. (Blue 



Marl of Monmouth Co.) 

 En-chodus pressidens Cope, Proc. Am. Philos. Soc. Phila., XI, 1869, p. 241. 



Cretaceous Greensand of New Jersey. 

 Cope. Rep. U. S. Geo. Sun-. Terr., II, 1875, P- 277. (Greensand No. ? 



of N. J.) 



Fragment of left premaxillary with base of anterior tooth 

 (damaged). Length 38 mm. 



Tooth (damaged) compressed laterally, forming rather broad 

 longitudinal concave groove each side, and constricted convex 

 surface with numerous fine parallel vertical basal striae. Broad 

 expanded convex surface smooth. Entire cutting-edges sharp. 

 Crown of this tooth tapering rapidly to broad compressed and 

 finally sharp point. Base of crown slightly flaring a little behind. 

 Length 36 mm. 



Another tooth comparatively broader, without striae, form 

 more compressed so convex side faces assymmetrical laterally. 

 This tooth also shows very minute serras along its cutting-edge. 

 Length 38 mm. 



The above examples are described in detail as they are Mor- 

 ton's originals. This species is the most abundant of the genus 

 within our limits. It seems to be characterized by the cutting- 

 edges of the large teeth extending both sides basally. 



Formation and locality. Besides the above-described examples, 

 ascribed to the "Blue marl of Monmouth County" [either Nave- 

 sink or the Shark River, probably the former, K.] (3) ; a large 

 fang and portion of attachment from "the Greensand at Free- 

 hold in Monmouth County" [Navesink marl] (J. H. Slack 1) ; 

 also portion of jaw with three large conic teeth without other 

 locality than Xew Jersey (C. C. Abbott 1) ; portion of jaw and its 

 attachment labeled New Jersey, and fragment of jaw with two 

 large solid teeth and a series of externals of small size from Bur- 

 lington County. The following detached teeth seem to belong to 

 this species : 1 of moderate size found with Hadrosaurus foulkii at 

 Haddonfield [in the Woodbury clay, K.] ; 1 from "New Jersey" 

 (C. C. Abbott) ; i from "New Jersey" (E. D. Cope) ; 1 from 

 the Cretaceous of "New Jersey" (J. Leidy) ; 1 imperfect from 

 Monmouth County (C. C. Abbott) ; 1 from Vincentown in Bur- 



