23. i Herre: Notes on Philippine Sharks, I 71 



far apart, without nasoral groove; mouth arched, with prominent 

 labial folds ; teeth of medium size, two transverse rows function- 

 ing in upper jaw and three in lower; in upper jaw are a few 

 (two or three rows) very small erect median teeth with a central 

 sharp-pointed cusp and usually two smaller ones at each side of 

 its base ; the remaining teeth are much larger, strongly oblique, 

 with a longer sharp-pointed cusp directed outward toward the 

 angle of the mouth, and with two or three much smaller denticles 

 on the outer side; in lower jaw the teeth of the six median rows 

 are larger than the upper median teeth, are erect or nearly so, 

 and have a central cusp with from no denticles to three small 

 ones on each side of base; the remaining rows are of teeth 

 smaller than the opposing upper teeth, strongly oblique, with 

 a larger cusp directed toward angle of mouth and one to four 

 minute cusps or denticles on outer side; the fifth pair of gill 

 slits is the smallest and is over the pectoral ; the first dorsal is 

 over the space between pectorals and ventrals, but much nearer 

 the former; origin of second dorsal in advance of anal; caudal 

 rather short, without a pit at its base, with a notch in the sub- 

 caudal lobe, and a moderately developed anterior lobe. 



Body not compressed; lateral line noticeable, rather high up, 

 beginning on head. 



Hemitriakis leucoperiptera 1 sp. nov. Plate 1. 



Head 4.775 in length, its greatest breadth a trifle more than 

 half (50.4 per cent) of its own length; snout sy 13 in head; eyes 

 6 y 4 in head and a trifle less than twice in interorbital space; 

 spiracles 5% in eyes; depth 7.95 in total length and 6.31 in length 

 without caudal fin. 



Head long, its profile descending very sharply from predorsal 

 region, its anterior portion very low and depressed, with flat- 

 tened crown and interorbital space; eyes large, much elongated, 

 with a broad shagreen-covered nictitating fold; the small, slit- 

 like spiracles just behind eyes; snout rather long and pointed, 

 with a slightly rounded tip; nostrils as far apart as possible and 

 nearer mouth than tip of snout; each anterior valve has an outer 

 triangular pointed flap near inner angle of nostril and under and 

 at right angles to it a smaller dividing fold or flap ; each posterior 

 valve has a slight fold, or ridge, near inner angle; mouth cres- 

 centic, its transverse length equal to interorbital space, with well- 

 developed labial folds, the outer parallel with contour of head 



1 Leucoverivtera from Xe^-oy. white: irem, around; and *T£w6v t wing, or 



