364 Memoir Sears Foundation for Marine Research 



or less spine-like posteriorly, the bases pear-shaped; two similar tubercles on each 

 shoulder; upper surface smooth elsewhere. Lower surface smooth. 



Snout in front of eyes about 4.3 times as long as distance between orbits; its 

 length in front of mouth about "^.i, times as great as distance between exposed nostrils. 

 Eye small, a little less than 1/5 (iS^o) as long as distance between orbits. Spiracle about 

 three times as long as eye. Posterior margin of nasal curtain finely fringed. Lower jaw 

 a little indented at symphysis and upper jaw projecting a little to correspond. Floor 



^f_ 



Figure 85. Dasyatis geijskesi, juvenile male, about 

 340 mm wide; after Boeseman. 



of mouth with one median papilla flanked on either side by several low and indistinct 

 prominences, perhaps forerunners of future papillae. 



Teeth about §1, oval or rhomboid, in quincunx. 



Pelvic fins of distinctive shape; anterior margins straight, about 2.2 times as long 

 as distance from origin of pelvic to its rear limit; outer corners slenderly pointed; 

 posterior margin concave outwardly but becoming convex inwardly to merge with 

 broadly rounded rear corner, the curvature continuing around short inner margin ; 

 posterior limits of pelvics a little anterior to posterior limits of pectorals. 



Color. Upper surface described as dark brown, lower surface as pale with darker 

 margins and teeth as yellowish white. 



Size. The only specimen seen, with disc 360 mm long, was a juvenile male. The 

 size at maturity is not known. 



Range. Known only from the type specimen taken at Surinam (Dutch Guiana). 



Reference : 



Dasyatis geijskesi Boeseman, Zool. Meded., JO (2), 1948: 38 (descr., ills., Surinam [Dutch Guiana]). 



