3S6 THE PLAGIOSTOMIA. 



DASYBATUS MARGARITA. 



Trygon margarita Gunth., 1870, Cat. fishes Brit, mus., 8, p. 479; Steindachner, 1894, Notes Leyden 

 mus., 16, p. 91. 



Disk subround, scarcely longer than broad, anterior margins forming an 

 obtuse angle beyond which the tip is produced in a short point, outer angles and 

 margins broadly rounded. Mouth with three long papillae and two short ones. 

 Skin smooth; a large round tubercle in the middle of the back, and in cases traces 

 of a second in front of the large one. Tail two and a half times the length of the 

 disk, with a dermal fold below, none above. In the young according to the 

 original description the disk was 85 inches long, the tail 19. 



Brown above; white below. 



West Africa. 



Dasybatus schmardae. 



Trygon schmardae Werner, 1904, Zool. jahrb., 21, p. 298. 



"Nahe verwandt mit Trygon hystrix M. & H., aber durch folgende Merkmale 

 unterscheidbar: Scheibe vorn nicht vollkommen abgerundet, sondern mit 

 kleinem Schnautzenzipfel. Oberseite vollstandig rauh, auch die Brustflossen, 

 wenngleich sparlicher als der Rumpf. Schwanz ohne vergrosserte Dornen. 

 Scapulargegend mit 2 grossen, runden, Strahlig gerippten Tuberkeln nebe- 

 neinander (Entfernung wie die der Nasenlocher). Schwanz fast doppelt so lang 

 wie die Schiebe. Farbung gleichformig braun, Schwanz dunkler. 



Lange der Scheibe 24, Breite 26, Schwanzliinge 47 cm.; Entfernung der 

 Nasenlocher 2\, der Augen 4a, der Nasenlocher von der Schnauzenspitze 4 cm. 



1 Exemplar (9) aus Jamaica." 



Dasybatus torrei, sp. nov. 



Trygon species dubia. — Lebisa 319, Poey, 1868, Synops. pise. Cub.; Repert. fis.-nat. Cuba, 2, p. 457. 

 Raja?. . . . — Lebisa. — Num. 316, Poey, 1876, Enum. pise. Cub., p. 205; An. Soc. Esp. hist, nat., 6. 



"Lebisa" of the Cubans is intermediate in shape between the circular of the 

 Potamotrygones (Plate 31) and the polygonal of most Dasybati (Plate 32), but is 

 nearer the latter. The rostral section is short and is so broadly rounded in front 

 of the head that the forward margin of the disk is nearly straight for some 

 distance. Toward the sides near the widest part the curves become more abrupt ; 

 in about two thirds of the length (behind the spiracles) the disk narrows rapidly 

 toward the ventral fins. There are no angles either at the sides or in front; a 

 papilla marks the median line of the snout. The greatest width is a short 



