48 CONTKIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



Caudal spiue 1^ times width of mouth. Spiracles very large. Color 

 nearly uniform brownish, L. 8 feet. Cape Cod to Florida ; common. 

 (Perhaps includes more than one species.) 



{liaia centrara Mitchill, Traus. Lit. & Phil. Soc. N. Y. i, 479 : Pastinaca hastata De- 

 kay, New Yofk Fauna, Fishes, 373: Trygoii hastata Giiuther, viii, 476.) 



** Upper aad lower caudal folds well developed. (DasyaUs.) 



62. I>. sayi (Lo Sueur) Goodo & Beau. 



Disk rhomboidal, a little broader than long, the muzzle moderately 

 promiuent. Width of mouth contained about 2^ times in the length of 

 the snout. Tail with two well-developed folds, the lower fold consider- 

 ably the larger, both smaller than in D. dipternrus. Tail slender, 

 prickly, nearly twice as long as the disk ; its spine extremely long ; its 

 length 2J times the width of the mouth. Skin smooth in the youug, 

 becoming roughish with age. Several rather strong recurved spines 

 along the middle line of the back. Spiracles moderate. Buccal papillae 



5 (7). Color brownish. South Atlantic States to Brazil. 



(Raja say Le Sueur, Jouru. Ac. Nat. Sci. Phila. 1817, 42 : Tryyoii sayi Duuidril, 

 Elasmobrauch. G03: Trygon pastinaca part GUnther, viii, 478.) 



63. D. diptcrurus Jordan & Gilbert. 



Disk rhomboid, slightly broader than long, anterior margins nearly 

 straight, meeting anteriorly in a very obtuse angle ; posterior margins 

 curved ; lateral angles rounded ; tail nearly half longer than the disk, 

 with a conspicuous cutaneous fold below and a smaller but evident one 

 above; jaws considerably arched ; buccal iTapillseS; teeth ||^. Young 

 perfectly smooth. Adult with a row of low but rather stout tubercles 

 on the median line of the scapular region and two others on the humeral 

 region. Tail with small prickles. Caudal spine loug, its length nearly 

 3 times the width of the mouth. Color bluish browu, nearly plain. L. 



6 feet or more. Bay of San Diego, California; abundant. 



(I)asybatis diptenirus Jordan & Gilbert, Proc. U. S. Nat. Mus. 1880, 31.) 



64. D. tube i*c Hiatus (Lacep.) Goodo & Bean. 



Disk rhomboidal, a little broader than long ; anterior borders scarcely 

 concaVe, the posterior almost straight ; external angles rounded ; muz- 

 zle pointed ; tail below with a cutaneous fold, higher and longer than 

 the upper fold, covered for its posterior two-thirds with small ossifica- 

 tions ; tail nearly 2^ times length of disk. All the middle of the upper 

 surface of the body, from the posterior region of the head to the base 



