256 | O. C. Marsh—New Vertebrate Fossils. 
Heliobatis radians, gen. et sp. nov. 
The most interesting fossil Fish hitherto found in the Ter- 
tiary of the west is a land-locked Ray, recently discovered in 
the Green River beds of Wyoming. The specimen is in ex- 
cellent preservation, and shows the characters of the group 
most perfectly. It differs much from recent Rays, and resem- 
es most nearly the genus Cyclobatis of Egerton, from the Mt. 
Lebanon deposits of Syria, which are probably in nearly the 
latter differs from Cyclobatis in having a much greater number 
of radiating digits, which entirely encircle the body, and sug- 
the generic name. ere are also numerous dermal 
defensive tubercles, which are wanting in Cyclobatis. 
The principal dimensions of this rare specimen are as fol- 
WS: 
Antero-posterior extent of rays.....-...-.-.--------- 235" 
Transverse diameter across scapular arch to bases of rays 75° 
‘Sous Gremaverse Gmeter ee 5 -- e+ 280" 
Transverse diameter of head ee te TO, 
Distance between scapular and pelvic arches_.--.- --- 55° 
ngth of vertebrw at pelvic arch _-.-._-...-----.---- 2°6 
Length of vertebrz in caudal region -._----...-.----- 2° 
Yale College, August, 1877. 
