34G CALIFORNIA ACADEMY OF SCIENCES. 



VKRTHHRATA. 



Class PISCKS. 



Order ELASMOBRANCIIII. 



Suborder SKLACIIII. 



Fiuiiily TliYGUNlD.E. 



Genus Urolophus. 



408. Urolophus halleri (?) Cooper. 



Two stings of this species (one of the common Sting-Rays of the California 

 coast) were found in a perfect state of preservation in the upper San Pedro series at 

 San Pedro. Dr. V. II. (Jilhert, who identified the specimens, said tliat owing to the 

 insufficiency of the evidence offered Ijy the sting alone he was unable to make a 

 definite specific determination. 



Pleistocene. — San Pedro (Arnold). 



