588 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



notch at side of head to front edge, 45 mm.; width of mouth, 30 

 mm.; center of mouth, 16 mm. in front of line joining corners. The 

 yolk sac had been about absorbed (?), but the umbilical opening had 

 not closed. 



CARCHARIAS SORRAHi (MuUer and Henle). 



Two males and three females from Batavia. Length of males, 600 

 mm. and 220 mm.; length of females, 600 mm., 430 mm., and 315 

 mm. Tlie smallest male and the intermediate female have the snout 

 a little pointed and the mouth slightly different in shape. The 

 origin of the first dorsal, also, is more nearly midway between pec- 

 torals and ventrals, and is about over the end of the pectoral fm. In 

 the other specimens the origin of the first dorsal is over the middle of 

 the pectoral. These two specimens may represent the true C sorrah 

 and the rest C. javanicus, but we find no trenchant differences. 

 According to Bleeker's descriptions aU agree more closely with O. 

 sorrah than with any other species. 



RHYNCHOBATUS DJIDDENSIS (Forskal). 



One specimen, the total length of which is 550 mm., taken at 

 Batavia, represents the species figured under this name by Day.^ 

 The same species was described under the name R. Isevis by Bleeker^, 

 and by Mtiller and Henle.* 



TRYGON PASTINACOIDES Sleeker. 



One small specimen from Batavia, length, 190 mm.; tail, 120 mm. 

 Bleeker^ under this name and assigned to the synonymy of T. 

 uarnak by Day.' It is a very differently appearing fish from the 

 one figured by Day. It is possible that this species as well as T. 

 uarnacoides should be placed in the synonymy of T. uarnak, but as 

 we are unable to satisfy ourselves on this point, it seems better to 

 retain the names proposed by Bleeker. 



TRYGON UARNACOIDES Sleeker. 



One specimen. Length, 590 mm.; tail, 450 mm. Batavia. It 

 was originally described by Bleeker' but Day^ placed it in the 

 synonymy of T. uarnak. 



MYLIOBATIS NIEUHOFU (Bloch and Schneider). 



Two specimens from Batavia. Male: Length, 840 mm.; length 

 of disk, 250 mm.; width, 410 mm.; tail, 630 mm. Female: Length, 

 550 mm.; length of disk, 160 mm.; width, 260 mm. (about); tail, 



1 See Bleeker, Plagiostomen, p. 39, and Day, Fish. India, p. 714, pi. 185, fig. 1. 



» Fish. India, p. 730, pi. 192, fig. 1. 



3 Plagiostomen, p. 58. 



< Idem, p. 111. 



5 Idem, p. 75. 



» Fish. India, p. 737, pi. 195, fig. 1. 



' Plagiostomen, p. 72. 



8 Fish. India, p. 737, pi. 194, fig. 1. 



