386 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



ACIPENSERID^. 

 Genus ACIPENSER Linnseus. 



106. Acipenser sturio Linn. — Sturgeon. 



A large skin found in the harbor near Cape Lookout. 



CEPHALOPTERIDiE. 

 Genus CERATOPTERA Mliller & Henle. 



107. Ceratoptera vampirus (Mitch.) Gill. — DcvU-fisli. 



Fishermen state that they are occasionally found in the harbor. 



MYLIOBATID^ 

 Genus AETOBATIS Miiller & Henle. 



108. Aetobatis narinari Miill. & Heule. 

 One large specimen seen. 



Genus MYLIOBATIS Dum^ril. 



109. Myliobatis fremenvillei (Les.) Storer. 

 Tail of one specimen observed. 



DASYBATIDJE. 



(Trygonidw Gill, oi). cit.) 



Genus DASYBATIS Rafinesque (fide GiU). 



(Tri/gon Gill, op. cit.) 

 ; 110. Dasybatis centrurus (Mitch.) Gill, MSS. — Sting Ra\j ; Stingaree. 

 Very common. 



Genus PTEROPLATEA Miiller & Henle. 



111. ? Pteroplatea maclura (Le Sueur) M. & H. — Skate. 



Several specimens about one foot long, the young of some broad species. 

 They do not answer Le Sueur's account of the present species, and there 

 is no trace of a caudal spine, which on a Sting Ray of the same size is 

 fully developed. If not the young of Pteroplatea, they will constitute a 

 new genus. 

 The following are the characters shown by our specimens : 

 Disk very broad and short, its width nearly twice its length without 

 the tail; tail short, slender and small, its length about one-third that of 

 the disk ; a dermal fold above and below ; whole disk and tail covered 

 with smooth skin, without spine or roughness of any kind; snout pro- 



