728 CRETACEOUS PALEONTOLOGY. 



SO' characteristic of the genus, are not present at all upon the 

 New Jersey specimens of either this species or of the others 

 referred toi the genus by Whitfield. 



Formation and locality. — Navesink marl, Atlantic Highlands 

 (io8), near Freehold (133), near Walnford (i48_^), Crosswicks 

 Creek (149, 195). 



Geographic distribution. — New Jersey. 



Trachytriton 7 holmdelense Whitfield. 



Plate LXXXIV., Figs. 9-10. 



1892. Trachytriton ? Holmdelense Whitf., Pal. N. J., vol. 2 

 (Monog. U. S. G. S., vol. 18), p. 60, pi. 5, figs. 16-17. 



Description. — ^"Shell of medium size; spire moderately ele- 

 vated, having an apical angle of 50° or over; is composed of 

 about five very rotund volutions, and forms fully two-thirds of 

 the entire length of the cast when viewed from the back of the 

 specimen ; below the point of greatest diameter the cast is short 

 and the beak only slightly extended beyond the general rotundity 

 of the body volution; suture lines between the volutions in the 

 cast clear, distinct, and deep; aperture rather broadly elliptical; 

 rounded above; slightly pointed below and straightened on the 

 inner side below the middle of its height; columella moderately 

 strong and smooth ; surface of the cast marked by vertical folds, 

 13 or 14 to the volution; these folds distinctly bend backward in 

 the middle in crossing the whorl, and are again directed forward 

 below, forming a broad sinuosity in crossing the whorl ; no evi- 

 dence of revolving lines discernible on any of the specimens." 

 (Whitfield.) 



Remarks. — This species has not been met with in the recent 

 collections and the type specimen seems to have been lost or de- 

 stroyed. The species is certainly not a member of the genus 

 Trachytriton, but what its true generic relations may be cannot 

 now be determined. 



Formation and locality.- — Navesink marl, Holmdel (Whit- 

 field). 



Geographic distribution. — New Jersey. 



