ELASMOBRANCHII. 97 



Fig. 50. — Myliobatis kummcli Fowler. (Type, in transverse sectional view). 



two wrinkles of enameled surface, directed obliquely towards cen- 

 tral keel. Similar wrinkles occur on each lateral tooth. Length 

 (width) about 100 mm. 



This species is only known to me from the above-described 

 dental plate, which is nearly entire. It seems to differ from any 

 other American species, and certainly from any I have examined 

 in the lateral wrinkles on the enamel, which are not only distinct 

 on the lateral teeth, but also on the lateral moieties of the median 

 as well. 



Formation and locality. Specimen No. 7395, type, collection of 

 the Xew Jersey State Geological Survey. From the marl of Stow 

 Creek Township in Cumberland County [the so-called Shiloh 

 marl, which is referable to the Kirkwood formations of the 

 Miocene, K.] (Isaac Smalley in March of 1880). 



(I take pleasure in dedicating this species to Dr. Henry B. 

 Kiimmel, the State Geologist of New Jersey.) 



Myliobatis pachyrhizodus sp. nov. 



Dental plate depressed in form, thick, especially medianly, 

 composed of seven median teeth, and at least two series of lateral 

 teeth. Enamel surface slightly convex, with slight median de- 

 pression, scarcely concave, also each side sloping very slightly to 

 edges. Basal surface greatly convex, formed as median elevated 

 axis from which each side slopes abruptly down. Transverse 

 median sutures rather evenly and distinctly convex. Vertical 

 diameter of median teeth about one-fifth of horizontal diameter. 

 Lateral teeth rather large, only on right side, four in inner and 

 apparently same number in outer series. Enamel surfaces 

 smooth, without any very distinct wrinkles. Length (width) 

 about 53 mm. 



7 GEOL, 



