PSEUDOTRIAKIDAE. 103 



Lack of details concerning dentition, squamation, labial folds, etc., in the 

 description of the single known species prevents determination of its affinities 

 with any degree of certainty. Apparently it is nearer to Pristiurus than to 

 Catulus. 



Formosa. 



Proscyllium habereri. 



Scyllium (Proscyllium) habereri Hilgendobf, 1904, Sitzb. Ges. nat. freunde Berlin, p. 39. 



Head depressed, length twice the width, or less than one fifth of the total 

 length; snout elongate, more than half as long as the head. Nostrils slightly 

 oblique; anterior valves not joined, and not reaching to the mouth. Mouth 

 large, width little more than its distance from the end of the snout, outline on 

 the lower jaws forming a triangle from which the apex is rounded off about one 

 fourth of the altitude, i. e., one fourth of the length of the mouth. Pectorals 

 small, base about two thirds of that of the first dorsal. Dorsal origin one fourth 

 of the length of its base forward of the origins of the ventrals. Hinder angle 

 of the dorsals slightly produced. Base of anal extending nearly one seventh of 

 its length forward of the base of the second dorsal and about two and one half 

 times as much backward of it; its length is less than half its distance from the 

 subcaudal and is about twice the length of the base of the second dorsal. Length 

 of the subcaudal greater than its distance from the base of the anal. A notch 

 between subcaudal and terminal. 



Scattered small spots of black on the back, more elongate on the head, and 

 smaller spots of white in a row on the side. 



Total length 510, snout to vent 210, snout to pectorals about 90, and length 

 of snout 26 mm. 



Southwest coast of Formosa, near Takao. 



PSEUDOTRIAKIDAE. 



The large sharks placed in this family are closely allied to the Catulidae. 

 They differ in the length of the body as compared with that of the tail and in the 

 position of the first dorsal fin above the body cavity, in advance of the ventral 

 fins. The nostrils are separate from one another and from the mouth, the spira- 

 cles are of moderate size, the mouth is very large, the eyes are lateral and are 

 without nictitating folds, the dorsals are not preceded by spines, an anal fin is 

 present, the caudal is of moderate length, is without a pit at its root and, in the 

 subcaudal portion, is without a prominent lobe. 



