Fishes of the Western North Atlantic 261 



Galeus mento, Quijada, Bol. Mus. nac. Chile, 5, 1913: 107 (listed for Chile). 



Mustelus abbotti Evermann and Radcliffe, Bull. U.S. nat. Mus., 95, 1917: 6 (descr., meas., color, ill., Peru). 



Possible South Atlantic References: 



Mustelus asterias Lahille, Physis, B. Aires, 5, 1 921: 63 (name only, in list for Argentina) ; Enum. Peces Car- 

 tilag. Argent., 1921: 13 (brief account of teeth, Argentina); An. Mus. nac. B. Aires, 5^, 1928: 310 

 (Argentina, said to be common) ; Pozzi and Bordale, An. Soc. cient. argent., 120, 1935: 151 (Argentina, 

 Lat. 35°-42° S.; name only). 



Mustelus schmitti Springer, 1939 



Figures 42 F, Gj 43 C 



Study Material. Four specimens, 542 to 742 mm., from Rio Grande do Sul, Brazil, 

 and from Uruguay (U.S. Nat. Mus. and Harv. Mus. Comp. Zool.). 

 Distinctive Characters. See following Description. 



Description. Proportional dimensions in per cent of total length. Male, 571 mm., 

 from Rio Grande do Sul, Brazil (Harv. Mus. Comp. Zool., No. 35316). Female, 596 

 mm., from Maldonado, Uruguay (Harv. Mus. Comp. Zool., No. 530). 



Trunk at origin of -pectoral: breadth lO.0, 9.7; height 9.5, 8.4. 



Snout length in front of: outer nostrils 4.6, 3.55 mouth 6.$, 5.4. 



Eye: horizontal diameter 3.0, 2.5. 



Mouth: breadth 5.6, 6.4; height 3.3, 2.8. 



Nostrils: distance between inner ends 2.8, 2.2. 



Labial furrow lengths: upper 1.9, 1.95 lower 1.2, 1.5. 



Gill opening lengths: ist 2.1, 1.8; 2nd 2.3, 1.9; 3rd 2.3, 2.0; 4th 2.4, 2.0; 5th 



2.0, 1.9. 



First dorsal fin: vertical height 8.2, j length of base 12.6, 12.9. 



Second dorsal fin: vertical height 5.8, 6.45 length of base 10.2, 10.9. 



Anal fin: vertical height 3.5, 3.45 length of base 7.0, 7.4. 



Caudal fin: upper margin 19. i, 19. 5j lower anterior margin 8.9, 9.1. 



Pectoral fin: outer margin 14.9, 14.95 i'^^'' margin 8.1, 8.9; distal margin ii.i, 



1 1.7. 



Distance from snout to: ist dorsal 28.4, 28.55 2nd dorsal 61.5, 58.85 upper caudal 



80.9, 80.55 pectoral 20.2, 16.85 pelvics, 44.6, 42.85 anal 65.7, 65.1. 



Interspace between: ist and 2nd dorsals 21.9, 21.75 2nd dorsal and caudal 10.3, 



1 1.75 anal and caudal 6.3, 6.1. 



Distance from origin to origin of: pectoral and pelvics 24.2, 26.75 pelvics and anal 



21.2,21.2. 

 M. schmitti so closely resembles canis in general appearance, in the size, shape, and 

 location of fins, and in the teeth and denticles, that the points of difference alone need be 

 mentioned.*" The most striking difference between schmitti and canis lies in the outline of 



40. For discussion, see Bigelow and Schroeder (Free. Boston Soc. nat. Hist., ^i, 1940: 420). 



