256 Memoir Sears Foundation for Marine Research 



it has a center of abundance in moderate depths and comes into shallow water only when 

 the temperature of the latter is near the seasonal minimum." 



Synonyms and References: 



Musielus norrid Springer, Proc. U.S. nat. Mus., 86, 1939: 462 (descr., type loc. off Englewood, Florida, also 

 vicinity Key West, Florida) ; Proc. Fla. Acad. Sci., 3, 1939: 15 (same loc. as the preceding, comp. with 

 other species) ; Bigelow and Schroeder, Proc. Boston Soc. nat. Hist., 41, 1940: 417, pi. 14, fig. A, pi. 15, 

 fig. F, pi. 17, fig. C (meas., comp. with other species); Lunz, Bull. S. Carolina St. Planning Bd., 14, 

 1944: 26 (Florida); Bigelow and Schroeder, Guide Comm. Shark Fish., Anglo Amer. Caribb. Coram., 

 Wash., 1945: I 10 (descr., ill., range). 



\ Mustelus cams Y.vermzr\r\ and Kendall, Rep. U.S. Comm. Fish. (1899), 1 900: 48 (Key West, Florida)." 



^Cynais canis Fowler, Proc. Acad. nat. Sci. Philad., 58, 1906: 79 (Key West, Florida)." 



Genus Mustelus, Addendum 



Under this heading we include accounts of two more species of the genus that occur 

 in the coastal waters of Uruguay and southern Brazil 5 likewise of a third that has been 

 reported from northern Argentina. 



Mustelus fasciatus (Garman), 191 3 



Striped Dogfish 



Figure 43 Upper, A, B, C 



Study Material. Female and male, 484 and 613 mm. long (the types), Rio Grande 

 do Sul, Brazil (Harv. Mus. Comp. Zool., No. 154 and 315). 



Distinctive Characters. Fresh specimens of fasciatus are separable at a glance from 

 canis, norrisi and schmitti by their dark striped color pattern, and further, by a much longer 

 snout relative to the size of the eye,'° by the teeth, which are more nearly symmetrical, 

 their cutting edges evenly convex (Fig. 43 A), and by the distal margin of the pectoral, 

 which is considerably longer relative to the other margins of the fin. A further distinction 

 between fasciatus on the one hand and canis and norrisi on the other is that the lower ante- 

 rior corner of its caudal is not expanded as a definite lobe. The most obvious distinctions 

 between it and mento, which may also be dark-striped when young, are that the head (to 

 pectoral) is considerably longer than the interspace between the first and second dorsals in 

 fasciatus but shorter than the interspace in mento, and that the caudal of fasciatus lacks a 

 definite lower lobe (cf. Fig. 43 upper with 42 H). 



Description. Proportional dimensions in per cent of total length. Female, 484 mm., 

 from Rio Grande do Sul, Brazil (Harv. Mus. Comp. Zool., No. 315). Male, 613 mm., 

 same locality (Harv. Mus. Comp. Zool., No. 154). 



33. Springer, Proc. Fla. Acad. Sci., 5, 1939: 5. 



34. These nominal records are referred tentatively to this species because of the locality. 



35. Snout in front of mouth about 4.5 as long as horizontal diameter of eye in fasciatus, but only about 2.5 to 3 

 as long in either of these other three species. 



