394 Memoir Sears Foundation for Marijie Research 



Developmental Stages. Development is viviparous, the (four) embryos having been 

 described as attached to the mother by a placenta.""' 



Habits. All that is known of its habits is that it has been described (if identified cor- 

 rectly) as often entering estuaries and river mouths and feeding on small fish, ravaging 

 schools of clupeids and sciaenids in particular."" Apparently it is a littoral species. 



Relation to Man. While not considered very desirable as food, some are sold in the 

 markets of Trinidad and no doubt in the Guianas as well. 



Range. Western tropical Atlantic. The few records of this species are from: Surinam, 

 Dutch Guiana J Demerara, British Guiana; French Guiana, where it has been described 

 as rather common; Trinidad."' 



Synonyms and References: 



Carcharias (Prionoiori) oxyrhynchus Muller and Henle, Plagiost., 1841: 41, pi. 15 (descr., ill., Surinam); 

 MiJller and Troschel, in Schomburgk, R. H., Reisen Brit. Guiana, 1840-44,5, 1848:642 (Brit. Guiana, 

 said to grow to 6 to 8 ft.) ; Dumeril, Hist. Nat. Poiss., /, 1865; 356 (descr., Cayenne, Surinam) ; Gun- 

 ther. Cat. Fish. Brit. Mus., 8, 1 870: 375 (descr., no loc). 



hogomfhodon oxyrhynchus Gill, Ann. N. Y. Lye, 7, 1862: 410 (name). 



Carcharhinus {Isogomfhodon) oxyrhynchus Jordan and Evermann, Rep. U.S. Comm. Fish. (1895), 1896: 

 216 (name, Surinam); Bull. U.S. nat. Mus., 47 (i), 1896: 40 (descr., Surinam). 



Carcharinus oxyrhynchus Hargreaves, Fish. Brit. Guiana, 1904: 14, and append. 8 (name only, Brit. Guiana) ; 

 Vincent, Sea Fish. Trinidad, 1910: 53 (name only, Trinidad) ; Garman, Mem. Harv. Mus. comp. ZooL, 

 5<5, 191 3: 143 (descr., east. S. Amer.) ; Puyo, Bull. Soc. Hist. nat. Toulouse, yo, 1936: 85, 87,'** 

 250 (ill., but labels transposed, habits, food, vernacular name, French Guiana); White, Bull. Amer. 

 Mus. nat. Hist., ■j4, 1937: 128 (in Key). 



Euhmia oxyrhynchus Fowler, Proc. Acad. nat. Sci. Philad., 60, igo6: 65 (meas. of spec, listed above in Study 

 Material, Surinam?); Proc. Acad. nat. Sci. Philad., 67, 1916: 521^'' (female with embryos, in market, 

 Trinidad); Proc. Acad. nat. Sci. Philad., 7/, 1919: 129 (listed for Surinam). 



Carcharhinus forosus RanzanI, 1839 

 Figures 74, 75 



Study Material. Seven small specimens, 330 to 395 mm. long, from Surinam, 

 Pernambuco and Bahia (Harv. Mus. Comp. ZooL, No. 307, 526, 721, 1403, 1404); 

 female, 485 mm., and male, 500 mm., from Colon (U.S. Nat. Mus., No. 79317, 79316); 

 male, 831 mm.. Pacific Panama (U.S. Nat. Mus., No. 79293); also two females, from 

 Peru (Harv. Mus. Comp. ZooL, No. 692). 



Distinctive Characters. Porosus differs from all other western Atlantic members of 

 the genus in that the second dorsal originates about over the midpoint of the base of the 

 anal, that the terminal sector of the caudal is relatively smaller and that the outermost four 

 or five lower teeth are strongly asymmetrical with deeply notched outer margins like the 

 uppers. 



Description. Proportional dimensions in per cent of total length. Female, 485 mm., 



135. Fowler, Proc. Acad. nat. Sci. Philad., 6y, 1916: 521. 



136. Puyo, Bull. Soc. Hist. nat. Toulouse, jo, 1936: 87. 



137. Specimens are in the British Museum and in the museums of Leyden and Paris. 



138. Spelled "Carcharhynus." 139. Spelled oxyrhinchus. 



