98 THE PLAGIOSTOMIA. 



middle of the pectoral bases; anterior edge of the orbit midway from the end 

 of the snout to the third gill opening. Anterior nasal valves separated from 

 one another and from the mouth. Spiracles very small, behind the eye. Mouth 

 large, moderately arched; labial folds around the angles; lower fold two thirds 

 as long as the upper, which latter nearly reaches the nostril ; lower lip not over- 

 lapped by the upper. Gill openings narrow, hindmost above the pectoral. 

 Pectorals moderate, not reaching the ventrals by a distance equal to that between 

 the eye and the first gill opening. Dorsals subequal; interdorsal space less 

 than the preocular length of the snout. Origin of the first dorsal above the 

 hind ends of the bases of the ventrals. Hind end of the second dorsal base in 

 advance of the hind end of the anal base by a space equal to two thirds of the 

 diameter of the eye. Anal long, deep, narrowly separated from the subcaudal. 

 Origins of the ventrals little nearer to the origin of the anal than to the hindmost 

 gill opening. Caudal long, nearly one third of the total length. Scales small, 

 three cusped, slightly enlarged on the caudal peduncle. 



Total length of the type (cf) 47 cm.; snout to caudal 32.5, snout to second 

 dorsal 29, snout to first dorsal 22, snout to pectorals 10.7, length of the 

 dorsal bases 2.2, and length of the anal base 7.2 cm. 



Dark grey, paler on the lower surfaces; fins with blackish anterior 

 ^and whitish posterior margins; interior of mouth, gill chamber, and nostrils 

 blackish. 



Misaki, Sagami, Japan. 



Apristurus platyrhynchus. 



Scyliorhinus platyrhynchus Tanaka, 1909, Journ. Coll. sci. Tokyo, 27, p. 4. 



Body robust, moderately elongate, compressed and tapering backward; 

 head large, depressed; snout pointed, broadly rounded across the end. An- 

 terior narial valves separated from one another and from the mouth. Eye mid- 

 way from the end of the snout to the fourth gill opening. Spiracle small, 

 half the diameter of the pupil of the eye, near the orbit. Mouth moderate, 

 angles farther from the end of the snout than from the first gill opening ; lower 

 lip not overlapped by the upper near the angles; labial folds on both jaws, 

 lower fold extending about two fifths of the distance to the symphysis and upper 

 nearly half way to the nostril. Teeth three cusped. Gill openings small, 

 hindmost above the pectorals. Pectorals large, not reaching the ventrals. 

 First dorsal small, origin little in advance of the origin of the anal. Base of 

 the second dorsal two thirds as long as that of the first, origin above the end 



