FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 131 



terior eye edge and groove behind mouth angle; labial folds moderate, 

 lower twice long as upper which 14 I'amal length ; teeth rather stout, 

 moderately oblique, upper with tip straight, lower with tip bent some- 

 what inward, each with deep notch behind; upper median unpaired 

 tooth, no lower one; nostril width little less than eye, 2 small tri- 

 angular valvules, outer larger, near inner anterior nasal angle ; inter- 

 narial half space between snout tip and nostril, 1% between nostril 

 and mouth angle, li/^ between outer and nasal angles; interorbital 

 1/10 more than preoral length. Gill openings narrow, last 2 above 

 pectoral. 



First dorsal origin little behind inner pectoral angle, inner lobe 

 not quite reaching opposite ventral origin; second dorsal base 4% 

 in first dorsal base ; anal ends below middle and l^^o in second dorsal 

 base; pectoral triangular, outer and inner angles obtuse, width I14 

 its length and 1^ in first dorsal base, outer angle reaching anterior 

 third of first dorsal ; caudal 4 in total, subcaudal II/3 in caudal. 



Dark blue-gray above, lighter below. Fins without darker tips 

 or borders. A half-grown female. (Ogilby.) 



Queensland. 



Genus SCOLIODON Muller and Henle 



Scoliodon MtJLLEE and Henle, Sitz. Ber. Akad. Wiss. Berlin, 1837, p. 114. [Atypic. 



Type, Carcharias (Scoliodon) laticaudus Miiller and Henle; Arch. Naturg., 



1837, p. 397; Syst. Beschr. Plagiostomen, p. 27, 1841. Type designated by Gill, 



Ann. Lyceum Nat. Hist. New York, vol. 8, p. 35, 1861.] 

 Alopiopsis LiOY, Atti Soc. Ital. Sci. Nat. Milano, vol. 8, p. 398, 1865. (Type, 



Alopiopsis plejodon Lioy, monotypic. ) (Fossil.) 

 Rhizoprion (not Jourdain, 1861) Ogilby, Mem. Queensland Mus., vol. 3, p. 132, 



1915. (Type, Carcharias (Scoliodon) crenidens Klunzinger, orthotypic.) 

 Rhizoprionodon Whitley, Australian Zoologist, vol. 5, p. 3-54, 1929. (Type, 



Carcharias (Scoliodon) crenidens Klunzinger, orthotypic. Rhizoprionodon 



Whitley proposed to replace Rhizoprion Ogilby.) 



Body compressed. Head depressed. Snout elongate, end blunt. 

 Eye with well developed nictitating membranes. Mouth inferior, 

 greatly arched, with short labial folds at angles. Teeth alike in two 

 jaws, sectorial, more or less smooth on edges, bases broad, with tri- 

 angular cusp inclined over notch above base on outer edge; median 

 upper tooth and two symphyseal lower teeth, smaller sometimes. 

 Scales minute, with 3 to 5 keels. Subcaudal lobe prominent. Caudal 

 pits distinct. 



Temperate and tropical seas. Distinguished from Eulamia chiefly 

 by the entire teeth at all ages. Fossils are known from the Lower 

 Tertiary and later. 



