Fishes of the Western North Atlantic 259 



bands later in life." After many years in alcohol the dark bands have wholly faded, leav- 

 ing the specimens, which were collected in 1858 or 1859, mouse-gray above and a paler 

 shade of the same tint below. 



Size. The fact that the claspers are pnly about half as long as the inner margins of the 

 pelvics in a male of 613 mm. suggests that maturity is not reached until at a length of per- 

 haps 900 to 1,000 mm., or at about the same size as in cams (p. 247). 



Developnental Stages. Not known. 



Habits. Nothing known. 



Range. M. fasciatus is so far known only from Rio Grande do Sul, southern Brazil 

 (the type locality), and from the vicinity of Montevideo, Uruguay, and from Argentina, 

 Lat. 35° 30' S." 



Synonyms and References: 



Galeorhinus fasciatus GitTam, Mem. Harv. Mus. comp. Zool., 36, 1913: 172 (type descr., south. Brazil). 



Mustelus siriatus Devincenzi, An. Mus. Hist. nat. Montevideo, (2) i, 1920: 122, pi. 12 (descr., good photos; 

 vicinity of Montevideo, Uruguay); Devincenzi and Barattini, An. Mus. Hist. nat. Montevideo, (2) 2, 

 Suppl. Album Ictiol., 1926: pi. 2, fig. 3 (the dark cross bars indicated on ill.); Pozzi and Bordale, An. 

 Soc. cient. argent., 120, 1935: 151 (Lat. 35° 30' S.). 



MusCelus fasciatus Tortonese, Atti Soc. ital. Sci. nat., yy, 1938: 305 (descr., meas., ill., Rio Grande do Sul, 

 Brazil); Springer, Proc. U.S. nat. Mus., 86, 1939: 467 (in Key to species of Mustelus) ; Bigelow and 

 Schroeder, Proc. Boston Soc. nat. Hist., 41 (8), 1940: 417, 418, Table column J; pi. 14, fig. B, pi. 15, 

 fig. D, pi. 17, fig. E, pi. 18, fig. E (meas., discus., proport. dimensions, ill. of fins, teeth, denticles); 

 Fowler, Arqn. Zool. Estado Sao Paulo, 3, 1942: 129 (listed for Brazil). 



Mustelus mento Cope, 1877 



Figure 42 H-J 



Study Material. Female, 1,024 "irn- lo^^gj from Payta, Peru (Harv. Mus. G)mp. 

 Zool., No. 35246). 



Distinctive Characters. See following Description. 



Descri-ption. Proportional dimensions in per cent of total length. Female, 1,024 mm-j 

 from Payta, Peru (Harv. Mus. Comp. Zool., No. 35246). 



Trunk at origin of fectoral: breadth 10.5; height 9.5. 



Snout length in front of: outer nostrils 3.8 j mouth 5.6. 



Eye: horizontal diameter 2.0. 



Mouth: breadth 6.0 5 height 2.5. 



Nostrils: distance between inner ends 2.5. 



Labial furrow lengths: upper 2.45 lower 2.0. 



Gill opening lengths: ist 2.95 2nd 2.95 3rd 2.9; 4th 2.95 5th 2.2. 



First dorsal fin: vertical height 10.2 ; length of base 1 3.7. 



Second dorsal fin: vertical height 7.05 length of base 10.7. 



Anal fin: vertical height 4.OJ length of base 6.8. 



37. Pozzi and Bordale, An. Soc. cient. argent., 120, 1935: 151. 



