388 THE PLAGIOSTOMIA. 



Trygons. The few particulars given in Werner's original description hardly 

 favor a close comparison. Both are placed in the subgenus Pastinachus. 

 Werner's type is said to be nearly related to P. hystrix, to be not entirely rounded 

 in front but to have a small rostral projection, and to have a tail nearly twice the 

 length of the body. D. torrei is shaped posteriorly more like D. sabinus, that is, 

 it is broad anteriorly and narrows rapidly back toward the ventrals. It differs 

 from D. sabinus and P. hystrix in the broad curvature across the rostral section 

 and the sharper curves at the widest portions; its tail is much shorter than that 

 of D. schmardae, being only about one and one half times the length of the body. 

 Professor Poey noted that he had never seen Lebisa and did not know to 

 what genus it belonged. He introduced it in his lists of Cuban fishes because of 

 reported use of its rasp-like skin for scouring purposes. To Professor de la 

 Torre, in whose honor the specific name is given, is to be credited the scientific 

 discovery of the species. 



Dasybatus. 



A cutaneous fold below the tail, a keel above 



disk broader than long; smooth; buccal papillae 5 

 tail one and one half lengths of the body 



brown, greenish to olive or greyish, without or with spots of white 



pastinacus (page 389) 

 tail nearly twice length of body; back smooth 



brown, greenish to reddish . . . brucco (page 389) 

 tail about twice length of body; tubercles in a vertebral row and scat- 

 tered 

 brown, violet to dark; buccal papillae 5, or more 



violaceus (page 390) 

 tail more than twice length of body; papillae 5 



brown, reddish to dark; tubercles in a vertebral row, compressed 



longus (page 390) 

 tail about one and one half lengths of body; tubercles in vertebral and 

 parallel rows 

 brown, bluish to olive; buccal papillae 3 . hastatus (page Z91) 

 tail more than twice the body ; back rough; tubercles narrow, in verte- 

 bral and scapular rows 

 brown, yellowish to olive, uniform to spotted with darker 



guttatus (page 391) 



