482 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Dicerolatis draco Gunthek, Ann. Mag. Nat. Hist., ser. 4, vol. 10, p. 422, 1872 

 (type locality: Misol). 



Mobula draco Gaeman, Mem. Mus. Comp. Zool., vol. 36, p. 451, 1913 (Misol). — 

 Fowler, Proc. 4th (1929) Pacific Sci. Congr., Java, p. 507, 1930 (refer- 

 ence). — Whitley, Australian Zool., vol. 8, pt. 3, p. 186, 1986 (compiled). 



Dicerohatis thurstoni Lloyd, Rec. Indian Mus., vol. 2, p. 179, fig. 3, pi. 4, fig. 

 2, 1908; vol. 26, pt. 6, p. 9, 1913 (type locality: Mekran and Oman). 



Morula thurstoni Whitley, Australian 2k)ol., vol. 8, pt. 3, p. 187, 1936 (copied). 



Depth 5% in disk measured from median concavity of snout to 

 hind pectoral edge; head 4; disk length 1% in its width, 1% in tail; 

 head width little greater than its length. Tip of rostral flap to eye 

 114 in head; eye 5%, 6% in interorbital ; mouth width I14 in head; 

 teeth in 50 to 52 rows in jaws; internarial space slightly less than 

 mouth width; interorbital slightly greater than head length, nearly 

 level or only very slightly convex. Gill openings large, second to 

 fourth largest or 4% in interorbital, last % of third. Spiracle small, 

 inconspicuous below ridge and in deep wide groove, about size of 

 pupil. 



Skin smooth. No caudal spine. 



Dorsal length 2% in interorbital, ends little before hind ventral 

 ends ; no anal ; tail long and whiplike ; pectorals falcate, angles acute 

 and rather sharp, front edges of fin nearly straight and hind edges 

 concave ; ventrals small, rather long, ends obtuse. 



Brown above, paler to whitish below, with pectorals terminally 

 little brownish. 



Red Sea, Arabia, India, Pinang, East Indies, Philippines, Queens- 

 land, Although Garman has accepted 4 species in this genus without 

 a serrated caudal spine I cannot believe that the distinctions, based 

 on the width of the dental bands and the length of the tail are satis- 

 factory. Day gives the dentition as 340 upper and 360 lower teeth 

 in jaw 12 inches across gape and 5,490 mm. (18 feet) wide; one 4 

 inches across jaws had 240 rows above and 244 below; Cantor gives 

 80 teeth above and 95 below for an example 30 inches (663 mm.) 

 wide. Garman gives the teeth in Mohula huhlii as 44 rows above 

 and 54 below in an example 420 mm. wide. Dumeril separates Ce- 

 phaloptera huhlii on the dental plate entire behind and with but 36 

 to 38 rows of teeth, while in the present species he gives the dental 

 plate emarginate behind and the rows of teeth about 80. As he had 

 Miiller and Henle's type of the former he gives the disk width 740 

 mm. In Giinther's Dicerohatis draco the disk is 384 mm. wide and 

 the upper teeth are said to be in 46 series. It was supposed by Garman 

 to differ in the longer tail, which about equals 2% disk lengths. 



5705. Manila market. May 4, 1908. Length, 1,038 mm. 



1 example. A.N.S.P. Philippines. Commercial Museum of Philadelphia. 

 Disk length, 254 mm. 



