40 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



Dasybatus pastinaca, (Klein) Walbaum, 1793, Kleiuii Ichthyol. EuocL, p. 35. 



Disk broad, four-fifths as long as wide; pectoral angles considerably 

 in advance of the mid-length of disk; rostral angle very wide, tip of 

 snout produced in a point beyond the balance of the margin. Center 

 of body thick. Tail about one and a half times the length of the disk, 

 with a narrow membrane or keel beneath. The body and tail are with- 

 out asperities in this, a very young specimen. Mouth undulating, curved 

 forward. Eyes rather small, smaller than the spiracle. Nostrils and 

 nasal valves dark. Teeth small, blunt. Three elongate papillie at the 

 bottom of the mouth, close together. Color olivaceous brown, margins 

 lighter, tail darker; light beneath. 



Total length 17.5; tail 10; and width 9.5 inches. 



Young male. No. 26507. No locality. 



Dasybatus kuhlii, sp. M. & H. ^ 



Disk broadly rounded in front, snout not prominent— included in the 

 broad curve of the anterior margin, lateral- posterior margin nearly 

 straight. Margin of disk in front of head rather thick. Eyes promi- 

 nent ; orbit as large as the spiracle. Interspiracular distance equal dis- 

 tance of eye or mouth from tip of snout. Mouth small, curved; width 

 equal more than half the distance from the end of the rostrum. Upper 

 jaw forming an angle in front; symphysis turned downward; two^a- 

 pillae on the floor of the mouth. Tail about one and a half times the 

 length of the disk, with a short low cutaneous fold close behind the tip 

 of the spine and a longer broader one below extending backward from 

 near the spine's base; this fold grows narrower backward, but is con- 

 tinued nearly or quite to the extremity. 



Olivaceous, uniform or with one or more rounded dark-edged small 

 spots of light color over the xjosterior portions of the pectorals ; white 

 beneath. Tail darker behind the spine, with broad bands of white to- 

 ward the end. 



Total length 15.5; snout to end of pectorals 0.5; snout to end of ven- 

 trals 7.5 ; snout to mouth 1.1 ; and width 8 inches. 



No. 26519. No locality. 



Dasybatus, sp. 



Foetus 7 inches in length, of which 5 is tail. Snout and pectorals 

 rounded, former not prominent. Tail with a membranous expansion 

 above and another below, the latter wider and longer. 



No. 26544. Japan. 

 Dasybatus varidens, sp. u. 



Disk broad, four-fifths as long as broad, angles bluntly rounded. 

 Snout blunt, without a prominence. Eyes rather large, larger than the 

 spiracles. Mouth medium ; its outline appearing as if the middle third 

 of its length had been set forward a short distance ahead of the other 

 two-thirds. On the upper (anterior) jaws the teeth at each end of this 

 middle third, in the angles, are larger, triangular and pointed. Two 



