REVISION OF CARCHARHINID SHARK GENERA — SPRINGER 623 



(fig. 13); in mature males the cusps of tlie anterior teeth of the 

 lower jaw (and sometimes upper) are slenderer and rounder in cross 

 section than in females and young males. This situation is some- 

 what analogous, but less striking than that found in Scoliodon (p. 578). 

 Enlarged hyomandibular pores 3-8 (usually 4-7) on each side of head. 



Denticles imbricate, 3-ridged and 3-toothed in young, 3- to 5- 

 ridged and 3- to 5-toothed or irregularly margined in adults. 



Color of preserved specimens: Body slate gray or brownish 

 gray above, pale below; pectorals dusky with a pale margin; pelvics 

 and anal pale or light dusky; caudal uniformly dusky or with a pale 

 area centrally on each side; margins of upper caudal lobe black to 

 dusky-edged; first dorsal with or without a pale or faintly dusky 

 posterior margin; second dorsal dusky. Distal portion of clasper of 

 adult male sometimes abruptly paler than remainder. 



Interdorsal ridge, when present, very faint. Both precaudal 

 pits present, the upper better developed. 



Growth changes: There is a slight tendency for distance from 

 snout tip to eye, mouth, first gill-opening, and pectoral origin to 

 decrease in percent of t.l. with increased t.l. Eye diameter and 

 caudal notch depth decrease similarly. There is a slight tendency 

 for snout tip to anal origin and upper and lower caudal lobe origins 

 to increase in percent of t.l with increased t.l. 



In large specimens there is a tendency for the axis of the upper 

 caudal lobe to become raised in relation to the horizontal axis of the 

 body. 



The following tabulation indicates that males have mature claspers 

 at between 287 and 380 mm.; however, in at least one male, 387 mm., 

 with mature claspers, dentition was still sexually undifTerentiated. 



The smallest non-embryo examined was 219 mm. from 

 Batavia; the largest embryo was 261 mm. from Bombay. An embryo 

 231 mm. was examined from Batavia indicating variation in size at 

 birth. The largest specimen seen was 610 mm. from Kanara, India. 



No information is available on vertebral variation among siblings. 



724-334—64 5 



