212 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



ANALYSIS OF SPECIES 



o^. PiATTSQUALUS. Head heart- or kidney-shaped, oculonarial expansion nar- 

 row; eyes and nostrils not widely separated tiburo 



a2. Head hammer-shaped, very broad. 



h\ Sphybna. Eyes and nostrils close together. 

 (f-. Oculonarial expansion at right angles to body. 

 d\ Narial groove in front of snout ; outer edge of hammer rounded and 



front of snout broadly rounded tudes 



d'. No narial groove; outer edge of hammer and front of snout nearly 



straight mokarran 



(f. Oculonarial expansion medium, oblique. 



e\ Concavity in front profile, as seen from above, very slight over 



nostril; cusps of teeth low, very oblique lewlni 



e^ Concavity in front profile, as seen from above, deep over nostril; 



cusps of teeth prominent zygaena 



&^ EusPHYRA. Eyes and nostrils widely separated ; oculonarial expansion 

 wide, slender blochii. 



Subgenus Platysqualus Swainson 



SPHYRNA TIBURO (Linnaeus) 



Squalus tiburo Linnaeus, Syst. Nat, ed. 10, vol. 1, p. 234, 1758 (type locality: 

 In America) ; ed. 12, vol. 1, p. 399, 1766.— Walbaum, Artedi Pise, vol. 3, 

 p. 516, 1792 (copied). — Cuvier, Rfegne animal, vol. 2, p. 127, 1817 (on "Marcgr. 

 181"). 



Zygaena tiburo Valenciennes, M6m. Mus. Hist. Nat. Paris, vol. 9, p. 226, 

 pi. 12, figs. 2a-b, 1822 (Brazil).— Cuvier, Regne animal, vol. 2, ed. 2, p. 394, 

 1829 (reference). — GtJNTHEB, Cat. Fishes British Museum, vol. 8, p. 382, 

 1870 (New Orleans, Belize, Atlantic, Bahia, China). — Elera, Cat. Fauna 

 Filip., vol. 1, p. 615, 1895 (Luzon, Manila Bay, Navotas). 



Sphymias tiburo Gr^vy, List fish British Museum, p. 50, 1851 (China; American 

 Seas). 



Cestracion tiburo Garman, Mem. Mus. Comp. Zool., vol. 36, p. 160, pi. 1, figs. 

 4-5, 1913 (Massachusetts Bay). 



Sphyrna tiburo Fowler, Hong Kong Naturalist, vol. 1, p. 86, 1930 (China). 



Sphyrna tiburu Fowleb, Proc. 4th (1929) Pacific Sci. Congr., Java, p. 495, 

 1930 (Atlantic Ocean). (Error.) 



Depth 5% to subcaudal origin; head 3%, length 1% its width. 

 Snout in profile 2l^ in head ; eye 7%, 3 in snout, 8% in interorbital ; 

 mouth width 2i/2 in head, length ly^ its width, no labial grooves; 

 teeth in 30 rows in jaws, entire, outer edge notched, without basal 

 cusps; nostril large, internarial 1% in head width, obsolete groove 

 forward along front snout edge to first emargination ; interorbital 

 equals head length to third gill opening. Gill openings with second 

 and third longest, last over pectoral. 



Scales very minute. 



First dorsal origin opposite inner hind pectoral angle, front fin 

 edge 1^ in head ; second dorsal length 2^ ; anal length 1^^, origin 

 little before second dorsal origin; least depth of caudal peduncle 



