1905.] NATURAL SCIENCES OF PHILADELPHIA. 457 



rather slightly convex above. Snout broad, depressed or somewhat 

 flattened, and margin obtvise when viewed from above. Eye small, 

 circular, lateral, nictitating membrane well developed, and position a 

 little anterior. Symphysis of mandible about opposite front rim of 

 orbit, mandible itself very broadly convex. Teeth in mandible entire, 

 long, slender, sharp ]K)inted and radiating more or less as it were from 

 margin of jaw. Teeth of upper jaw radiating inward or parallel with 

 those of mandible when mouth is closed. Upper teeth broad, triangu- 

 lar, and finely serrated along both margins, each one may be said to 

 have a slight notch on its outer or distal edge near base, margin at this 

 region also finely serrated. Tongue broad and flat, only a little free 

 around edges. Each corner of mouth with a short fold which extends 

 obliquely outward. Nostrils nearer front of upper jaw or eye than 

 tip of snout, oblique, rather large and each with a small pointed flap. 

 Interorbital space broad and a little convex. 



Gill-openings 5, last two over base of pectoral, and median three 

 largest. No spiracle. 



Body covered with fine shagreen denticles, largest on middle of back 

 and anterior margins of fins basally. Head with numerous inconspicu- 

 ous pores. 



First dorsal inserted nearer origin of pectoral than that of ventral, 

 its upper margin about 2 base of fin slightly undulate, and posteriorly 

 ends in a short point. Second dorsal similar, about equal to anal in 

 size, and inserted a trifle behind origin of latter or much nearer origin 

 of upper caudal lobe than posterior basal margin of first dorsal. Anal 

 similar to second dorsal. Upper caudal lobe long, notched 'near its 

 end. Origin of lower caudal lobe a little in advance of that of upper, 

 but without a pit. Pectoral broad, reaching nearly f of distance to 

 origin of ventral, and posterior margin but little curved. Ventral 

 broad, inserted nearer origin of anal than that of pectoral and corners 

 rounded obtusely. Claspers small, on outer margin about 2f in length 

 of anterior edge of ventral. 



Color in alcohol, more or less uniform gray above and on fins, below 

 white. Lower surfaces of pectorals and ventrals w'hite. Side of head 

 till eye is included gray like upper surface, otherwise lower surface 

 white. Caudal gray, paler along lower portion of vertebral column. 

 Iris slaty. 



I^ength 24^ inches. 



Type No. 2,390, W. I. A. P. Baram, Borneo. 1897. Mr. Alfred 

 C. Harrison, Jr., and Dr. H. M. Hiller. 



Also paratype No. 2,391, W. I. A. P. Same data. Length 14^ 



