ADDENDA TO ilARSIPOBRANCIIII, ELASMOBRANCITir, ETC. 65 



genus Platyn'liina, this species proves to be viviparous. It is, there- 

 fore, referred to the Rliinobatidce, tlie oviparity of Raiidce being the only 

 character distinguishing the two families. 



" (Plali/rhiiia, trlserlata Jordan & Gilbert, Proc. U. S. Nat. Mus. 1880, 36.) 



"45 (d). It. ICBsJigiEiostas Garman. 



' ; Grayish, with small paler spots, uniform below. , Outline similar to 

 that of E.productns. Snout long and narrow, its ridges close together 

 throughout. Eyes large, twice as large as spiracles. Interorbital space 

 narrow, concave, as wide as nostrils or the interspace between them. 

 Distance between outer angles of nostrils more than half the snout. 

 Mouth straight, its width not quite twice the interorbital space. Dorsal 

 and preocular spines very small ; 5 larger spines on tip of snout. Su- 

 praocular and scapular spines obsolete. L. 22 inches. Width 3 in length ; 

 tail about 2 ; snout to the mouth 5f . Coast of Florida. ( Garman.) 



"(Garman, Bull. Mus. Comp. Zool. 1880, 168.)" 



Page 47, genus Dasyatis : The following synopsis of the American 

 species of the genus Dasyatis^ or better Dasibatls, has been prepared at 

 our request by Mr. Samuel Garman, of the Museum of Comparative 

 Zoology. It was received too late for insertion in the text. We, there- 

 fore, place it here in the form in which it was written by its author : 



THE AMERICAN SPECIES OF THE GENUS DASIBATIS.* 



BY SAMUEL GARMAN. 



Tail more than twice the length of the disk, 

 keeled on the top ; 



snout acute, pointed ; tail very long, round tiiberculata 



snout not prominent ; tail compressed longa 



round on the top, compressed, with lateral series of large tubercles; 



snout not prominent ; anterior margins slightly sinuous centrum 



snout prominent, with a series of long, narrow, depressed tubercles on the 



middle of the back lata 



Tail less than twice and more than one and a half times the length of the disk, 

 with two expansions ; 



disk subcircular ; snout prominent '. . sdbina 



disk quadrangular ; snout not prominent sayi 



keeled on the top, with an expansion below ; with three series of tubercles on the 



shoulders liastata 



Tail less than one and a half times the length of the disk, 

 with two expansions ; 



mouth with five papillae trevis 



mouth with three papillae dlpterura 



*Dasy~balus Walbaum, Kleinii Ichthyol. Enod. sive Index rerum, etc. 1793, 35 : type 

 Eajapastinaca L. This use of the name has precedence of "Dasyatis" Kaf. 



Bull. Nat. Mus. No. 16 5 



