REVISION OF CARCHARHINID SHARK GENERA — SPRINGER 621 



USNM 127099 (4: 503-612). Surinam: 6°24'-6°22' N. and 54°55'- 

 54°59' W., at 14 fathoms, USNM 196133 (1: 370); 6°21'-6°20. 5' N., 

 and 54°59'-54°54' W., at 14 fathoms, USNM 196134 (3: 352-390). 

 brazil: MNHN 945 (1: 303, male, here designated lectotype of 

 Carcharias (Scoliodon) lalandei), RNH 4339 (1: 315); Recife, Per- 

 nambuco, USNM 104310, (1: 417); Bahia, UZMK 356 (1: 572); 

 Victoria, SU 52749 (1: 640), SU 52853 (1: ca. 330), SU 52854 (1: ca. 

 365), SU 52856 (4: 292-311); Rio de Janeiro, MCZ 91 (1: 605),ZSZM 

 8037 (1: ca. 340), NMV [no nmnber] (1: 501), MNHN 1065 (1: 

 489), BMNH 1903.6.9.130-132 (1: 591); Bandeirantes, USNM 

 100811 (3: 324-350); south of Ilha Grande, SU 52759 (1: ca. 605); 

 fish market at Rio de Janeiro, SU 52750 (1: ca. 317), SU 52751 

 (1: 412), SU 52752 (1: 540), SU 52753 (1: 400), SU 52754 (1: 338), 

 SU 52755 (1: 335), SU 52756 (1: 311), SU 52757 (1: 330); Santos, 

 SU 14049 (2: 392-446), CAS 11812 (1: 313); mouth of Rio Itapoca, 

 (1: 358); Florianopohs, Ribeirao, SU 52862 (1: 506). "east indies" 

 [probably in error]: MCZ 485 (1: 501, here designated lectotype of 

 Scoliodon intermedins) . 



Rhizoprionodon (Protozygaena) oligolinx, new species 



Figures 12, 13; Plate 2c 



Diagnosis. — Upper labial furrow poorly developed, 0.0-1.3 per- 

 cent of t.l. (less than 1.0 percent in 37 out of 45 specimens) ; precaudal 

 centra not obviously elongate in posterior monospondylous region 

 (plate 2c); precaudal vertebrae greater in number than caudal ver- 

 tebrae; anterior margin of pectoral fin shorter than total length of 

 first dorsal fin; snout in front of nostrils 3.7-4.7 percent of total 

 length (only 3 specimens over 575 mm. seen and snout length of 

 only 1 of these was measured, 610 mm., 3.9 percent); total teeth in 

 outer row of upper jaw 23-25 (23 in 30 out of 55 specimens); total 

 teeth in outer row of lower jaw 21-24 (22 in 42 out of 55 specimens); 

 total enlarged hyomandibular pores on both sides of head usually 

 less than 16 (55 out of 56 specimens); first dorsal origin over, or just 

 posterior to, level of appressed pectoral inner corner ; origin of second 

 dorsal fin usually over a point just in advance of anal axil, but may 

 occur as far forward as above posterior third of anal base; tip of 

 appressed pectoral fin reaches to below level of anterior third or 

 less of first dorsal base. Males maturing at less than 380 mm. 



Description (see table 16). — Precaudal vertebrae 84-91 (only 

 1 specimen each, out of 54, with 84 and 91); caudal vertebrae 64-75; 

 total vertebrae 151-162; cusps of teeth smooth to faintly irregular; 

 posterior margins sometimes denticulate; anterior teeth of lower 

 jaw of mature males distinct from those of females and young males 



