460 PROCEEDINGS OF THE ACADEMY OF [Julj, 



The teeth in the saws range from 23 to 27 in the left side and 23 to 28 

 in the right side, the usual number being 26. Eye 2f to 3| in inter- 

 orbital space. Shagreen denticles along median keels of back, anterior 

 margins of dorsals and caudal above, pectorals, ventrals, and along 

 lateral keel of side of tail after ventral, enlarged. Keel after first 

 dorsal obsolete after -| of space to second dorsal. Origin of first dorsal 

 a little behind that of ventral. Eight examples 23f to 30|- inches in 

 length. 



RHINOBATID^. 

 4. Rhinobatos thouinianus (Shaw). 



.Internasal space about y in length of nasal cavity. Denticles along 

 middle of back enlarged, those along median line thorn-like. One 

 example 27^ inches long. 



DASYBATIDiE. 

 6, Daeybatus brevicauda (Swainson). 



A small example from the mouth of the Baram river is almost en- 

 tirely smooth above except the caudal spines and four short spines 

 which precede them on the median line of tail at base of caudal. 

 Length 10| inches. 



Another from the Baram, taken by Messrs. Harrison and Hiller, 

 agrees with Day's figure of Trijgon ivalga. It also has the tail a little 

 thickened just beyond tips of caudal spines. Length (caudal broken) 

 IH inches. 



A young example, possibly this species, is 4y\ inches. Dr. Furness. 

 n[Swainson's name, Pastinaca brevicauda, seems to be the oldest avail- 

 able .with any certainty of identification. Rata fluviatilis Hamilton* 

 is only to be referred to with doubt, as no attempt is made to particu- 

 larly designate any species under that name. Trygon immunis Ben- 

 nett^ is described thus: "Tryg. corpore subquadrato, omnino Isevi; 

 Cauda longiore, spinis duabus serratis citra medium armata." It may 

 possibly be identical, but the account is too brief. Pastinaca dor salts 



Subgenus PRISTIS Linck. 

 Type Squalus pristis Linnaeus. 



No lower caudal lobe. 



Nat Tijdfi. Ned. Ind., Ill, 1852, p. 441. Bandjermassing, in fluviis. 

 First is in Verh. Bat. Genoot. (Bijd. Pla,g. Ind. Arch.), XXIV, 1852, p. 55. 

 Bandiermassing, Borneo austro-orientalis, in fluviis. 

 6 Cat. Fish. Brit. Mus., VIII, 1870, p. 438. 

 ' Fishes of India, IV, 1878, p. 729, PI. 191, fig. 2. Madras. 

 8 Ace. Fish. Ganges, 1822, p. 1 (apparently called Raia lymma, p. 361). 

 « Mem. Life of Raffles (Cat. Zool. Spec), 1830, p. 694. Sumatra. 



