10 CALIFOUNIA ACADEMY OF SCIKNCES 



iK-twi't-n tlorsals; Ixisc of sccontl tlors;)! 65 tiiiu-s. Maij^in of second ilorsil ^(.iilly concave. I-'ront 

 margin low, tlie aii.yle l)roailly roiimled, l)aii'ly reaching;' jjosterior end of l)ase when (in is d<'clin('tl. 

 The posterior Iol)e is much produced and acute, shj^litly lonj;er than base of tin, tiie latter i^ in the 

 distance from its Ixise to front of c.uidal ]»[.. L'p|ier lohe of cauilal 35 in total length; the lower lobe 

 2 1 in the up|)er. Terminal loin.- of caudal 35 in the up|ier lohe. Anal larj^er than second d<«rs;il, 

 higher, with deeply incurved marj;in, its hise a little lonjjer, its orijj^in slij;htly in advance of that 

 t)f second ilors;il: the |K>sterior insertions of the two (ins nearly opiKisite. Length of mial base 1 i[ 

 in its distance from anterior edjje of caudal pit. 



Color bluish above, whitish or ).;rayish below. Free margin of pectorals narrowly white, tin- 

 anterior e(.l.i;e narrowly Ixirdered with black, which is most evident when seen from the outer surface, 

 the inner surface iK'inj,' dusky. The lirst dors;d is unmarked, the second dorsiil has the anterior lobe 

 diLsk\-. I'pjjer edije of caudal black, the lower marjLjin faintly dusky. I-'ins otherwisi- unmarked. 



A single specimen, n female, 120 cm. Ions;, was procured in tlie Panama mai- 

 i<et. As preserved, it i.s partially skinned. 'I'lie following measurements were 

 taken when the specimen was intact, hefore jireservation. Where not exactly 

 aijreein<i with dimensions given above, the latter will be luinul nioie reliable. 



iiiiii. 



Tip of snout to insertion of dorsal .^13 



Base of first dorsal 111 



Distance between dorsals 2.Sa 



Base of secc)nd dorsal 45 



From second dorsal to front of caudal pit 73 



FVont of caudal pit to tip of caudal 350 



Tip of snout to axil of pectorals 380 



Axil of pectorals to front of base of ventrals 283 



Front of ventrals to front of anal 165 



Front of anal to front of caudal pit 116 



Girth at front of first dorsal 451 



7. Carcharias cerdale (Gilbert, j 



Pl,vtk II, Fii!. 4. 

 Carc/iariniis ccrda/c GihUKKT, Jordan & Evermann, 1898, p. 2746. 



Body moderately compressed, not elevated, the depth at front of dorsal iiut more than one- 

 fourth i;;-reater than the oblique anterior marjrin of the dorsal fin, less than the distance from the nostril 

 to the first gill-slit. Head depressed, the snout flattened, lony and narrow, acute. I^enjrtli of snout 

 beyond mouth J to ,'5 greater than distance l)etween angles of nioutli in all but one (the largest) 

 specimen, where it is slightly less than width of mouth; j to J greater than distance from tij) of lower 

 jaw to a line connecting angles of mouth; ^ to ,'0 greater than wiiltli of snout o])i)osite outer angle of 

 nostrils. Interorbital width equaling distance from tip of snout to front of eye in the young, to middle 

 or posterior border of eye in older specimens; less than half distance to tir.st gilI-oi>ening. Middle of 

 eye nearer nostril than angle of mouth by i to ^ its diameter. Distance from eye to nostril 1 or 

 slightly more than | distance from nostril to tij) of snout. Middle of nostrils much nearer front of 

 mouth than tip of snout. Nasal flap with a ver\- narrow, short, acute lobe, placed at end of inner third 

 of flap. Outer angle of nostrils nearly at margin of snout, the inner angles sejiarated by a distance 

 equaling or slightly exceeding that between inner angle of nostril and back of eye. Lips very little 

 developed, the lower entirely concealed in closed mouth, the \ipper visible as a very short fold. 



Teeth in lower jaw narrow, erect, serrulate t)n both margins, more coarsely so toward base. 

 The serration is more conspicuous in the smallest specimens (45 cm.), and is obsolescent on some of 



