1905.] NATURAL SCIENCES OF PHILADELPHIA. 461 



Swainson/'' also based on Russell," is probably identical though follow- 

 ing P. hrevicauda, and therefore to be considered subsequent. All of 

 these names are older than Trygon walga Miiller and Henle/^ 

 which has had more general usage. 



6. Hypolophus sephen (Forskil). 



Tail with a single spine, its length a little greater along free lower 

 edge than space between tip of snout and front of eye. Tail without 

 asperities in front of caudal spine, and apparently not so asperous 

 posteriorly as shown in Day's figure.^^ Only two tubercles in middle 

 of back enlarged. Length 35 inches. 



7. Pteroplatea micrura (Schneider). 



I^ength of body from tip of snout to base of tail 2 in width. Great-est 

 width of disk would fall a little nearer center of length than shown in 

 Day's figure." Eye 3f in interorbital space. Width of disk 8^ inches. 

 Baram river. Alfred C. Harrison, Jr., and Dr. H. M. Hiller. 



PLOTOSID^. 



8. Plotosus canius Hamilton. 



A young example has a more flattened interorbital space than the 

 larger which is 16f inches. The former has depressed first dorsal also 

 reaching well beyond origin of second fin. 



CHLARIID^." 



9. Chlarias batrachus (Linnseus). 



Head, from tip of snout to gill-opening, 5: depth, about middle of 

 base of dorsal, 7; D. about 67; A. about 54?; space between origin of 

 dorsal and occipital crest 2k in head from latter point; pectoral reach- 

 ing about opposite origin of dorsal. One example in bad condition 

 agreeing with my Sumatran specimens. 



10. Chlarias leiacanthus (Bleeker). 



Head 5; depth at origin of dorsal 6J; width of head If in its length 

 to end of occiput; pectoral spine about 2^; space between dorsal and 

 occiput about 2f . Traces of pale spots in same pattern as those on 



^'^ Lardner's Cabinet Cyclopoedia Nat. Hist., II, 1839, p. 319. 



" Isacurrah tenkee Russell, Fishes of Coromandel, I, 1S03, p. 3, PI. 4. Vizaga- 

 patam. Madras. 



" Syst. Besch. Plagiosf., 1841, p. 159. Indien. Rothes Meer. (Britisches 

 Museum. M. HardAvicke. Leyden, Paris. MM. Roux and Dussumier ) 



" Fishes of India, IV, 1878, PI. 195, fig. 2. 



"L. c, PL 194, fig. 2. 



'^ Phagorus McClelland is a valid genus, differing in the confluent rayed dorsal 

 caudal and anal. 



Phagorus nieuhofii (Valenciennes), examined. 



