132 FISHES FROM GUAYMAS KVEKMANN AND JENKINS. 



8. Rhinobatus glaucostigma Jordan & Gilbert. 



Rhinobatus glaucostuima Jordau & Gilbert, Proc. U. S. Nat. Mus. 1883, 210 {Mazat- 



lan); Jordau, Pioc. U. S. N;it. Mns. 1H85, 3()4 (name only); Jordan, Cat. Fishes 



N. A., 188.-), 10. 

 RhinobalHS proclurfKn, Streets, Hiiil. V. S. Nut. Mus. 1877, \ii,r)5 (San Barlholome 



Bay, Lower California). 

 lihiiiohalitH leii<orli!)U(lius, JoTihin &: Gilborl, KnU. IT. S. Fish Com m. 1882, 105 (name 



only. Macatlaii). 



One speciineii 20 inches long. 



9. Urolophus nebulosus (Jarman. 

 Raya. 

 Urolophus nebulosus Garman, Proc. U. S. Nat. Mus. 188.'), 41 (Colima, Mexico). 



This species, represented in the collection by eighteen specimens, 

 scarcely differs from Urolophus halleri Cooper, except that the U[)pei 

 parts are light brown with small scattered inkish spots. These s[»ots 

 are most evident in the fojtuses in w hich they are placed regularly in a 

 row around the pectorals, this regularity disai)pearing with age. lu 

 the younger fietuses the skin of the upi>er margin of the spiracles is 

 prolonged in a lanceolate Hap as long as the eye; this character disap- 

 pears at an early age. 



Of the eighteen specimens secured b3^ us fourteen were foetuses, seven 

 each from numbers 1 and L* of the following table : 



Length of disk • 



Width of disk 



Leiifjth of tail from base of veiitrals 



_^ t .— — ^— — ^— — ^— — ^— — 



Three foetuses give the following measurements: 



7(17(1. 

 •JOl) 

 1!)5 

 133 



Length of disk... 

 Width of disk ... 



Lenjithof tail 



luterorhital spaoi 

 Snout to oye 



54 



50 



9 



13 



10. Dasyatis longus (Jarman. 



Raya. 



Dasibatis longa Garman, Hull. Mus. Comp. Zool. 1880, vi, 170 {.tcapulco ; Panama); 



Jordan & Gilbert, Synopsis, l88-i, ()(). 

 Dasyhntis Ion fins, Jordan, Proc. U. S. Nat. Mus. 1883, '.iM {Ma~a(lan). 



Four si)ecimens of this species, and a pair of Jaws of another speci- 

 men too large to preserve, are in the collection. The measurements 

 are as follows : 



I.,(Mit;th of ilisk. 

 Widtli of disk . 

 Length of tail.. 



1 lichen. 

 11.25 

 12.00 

 12 + 



Inches. 



8.25 



9.00 



12.00 



Inches. 



7. .50 



8.25 



11.00 



\ 



Inchet 



7.7.' 



8.2.' 



11. 5( 



i 



