274G Bulletin 4.7, United States National Museum. 



Page 37. After Careltarkimms htnlci add: 



45(a). CARCHARHINUS CEBDALE, Gilbert, new species. 



Body moderately compressed, not elevated, the depth at front of dorsal 

 not more than greater than the oblique anterior margin of dorsal fin, 

 less than distance from the nostril to first gill slit. Head depressed, the 

 snout flattened, long and narrow, acute ; length of snout beyond month 

 ^ to per greater than distance between angles of mouth in all but one (the 

 largest) of our specimens, in which it is slightly less than width of 

 mouth; f to * greater than distance from tip of lower jaw to a line con- 

 necting angles of mouth; -} to -fa greater than width of snout opposite 

 outer angle of nostrils. Interorbital width equaling distance from tip of 

 snout to front of eye in young, to middle or posterior border of eye in 

 older individuals; less than ^ distance to first gill opening. Middle of 

 eye nearer nostril than angle of mouth by ^ to f its diameter; distance 

 from eye to nostril or slightly more than i distance from nostril to tip 

 of snout; middle of nostrils much nearer front of mouth than tip of 

 snout; nasal flap with a very narrow, short, acute lobe, placed at end of 

 inner third of flap; outer angle of nostrils nearly at margin of snout, the 

 inner angles separated by a distance equaling or slightly exceeding that 

 between inner angle of .nostril and back of eye. Lips very little devel- 

 oped, the lower entirely concealed in closed mouth, the upper visible as a 

 very short fold. Teeth in lower jaw narrow, erect, serrulate on both 

 margins, more coarsely so toward base ; the serration more conspicuous 

 in our smallest specimens (450 mm.), and is obsolescent on some of the 

 teeth in adults; teeth in upper jaw broadly triangular, in front of jaw 

 narrower and erect, those in sides of jaw growing at once broader and more 

 and more oblique ; the lateral teeth with a strong notch on the outer side ; 

 both margins strongly serrate, the serrations increasing toward base, one 

 or more of those below notch sometimes enlarged and cusp-like in 

 adults; teeth about ||. Conspicuous areas of large and of small pores 011 

 underside of head. Gill openings of moderate width, the longest equal- 

 ing distance between eye and nostril, the fifth much shortened, about f 

 length of first. Eye small, equaling length of nasal opening, If to 2 in 

 middle gill slit. Pectoral short and broad, the posterior margin not 

 strongly incurved; tip of fin extending to a vertical intersecting dorsal 

 base at origin of its posterior third or fourth ; anterior margin of pectoral 

 3 times length of inner or posterior margin, the latter less than width of 

 base; first dorsal beginning behind a vertical from axil of pectoral a dis- 

 tance about equaling that which separates eye from nostril ; free margin 

 of fin gently concave, the anterior angle extending to a point midway 

 between base and tip of posterior lobe, when the fin is depressed ; base of 

 first dorsal 2 to 22 in interspace between dorsals ; base of second dorsal 

 7 in interspace between dorsals, 2i in its distance from anterior margin 

 of pit; origin of second dorsal falling over or behind middle of anal 

 base, the fin but slightly concave, with rounded anterior angle, its poste- 

 rior angle much produced, the posterior margin exceeding base of fin, 

 which about equals length of anterior margin ; anal inserted more ante- 



