36 BULLETIN 18 9, UNITED STATES NATIONAL MUSEUM 



mann and Radcliffe, now 480 mm. long, also is before me. The 

 embryos agree well with the larger specimens, except that the teeth 

 are not well developed. One specimen, which is shorter, though 

 more robust, than the embryos, has the teeth fairly well developed. 



This species is rather close to M. mento and M. dorsalis in shape 

 and form but differs from both in the structure of the teeth, and the 

 young at least also differ in color. Although this species has been 

 considered generically distinct from mento and dorsalis, and also has 

 been placed in a separate family, Triakidae (Beebe and Tee- Van, 

 1941, p. 94), on the basis of the structure of the teeth, it is not far 

 removed in this respect from the last-named species. In my opinion 

 the teeth in dorsalis differ more strongly from mento than from macu- 

 latus. Therefore, if maculatus is regarded as of distinctive generic 

 rank, dorsalis and mento should also be so considered. However, it 

 seems more expedient to assign them all to one genus in this publi- 

 cation. 



The adult, from which the embryos at hand were removed, was 

 240 cm. long and was taken on a line trawl off Lobos de Tierra Island 

 on August 17. One of the other specimens is from Lobos de Tierra 

 Bay, and the other three were taken in trammel nets, at La Lagunilla, 

 Patia Harbor, and at Don Martin Island. 



Range. — Originally described from the indefinite locality "Siidsee"; 

 later recorded from Mazatldn, Mexico, and from Callao, Peru; and 

 stiU later California and Chile were included in the range by Fowler 

 (see reference above), but on what authority the extensions of range 

 were based is not evident. 



Genus PRIONACE Cantor, 1849 



Body elongate, head tapering, depressed; snout rather long, pointed; 

 eyes lateral, with well-developed nictitating membrane; spu-acles 

 absent; labial fold rudimentary; teeth more or less triangular, with 

 serrate margins; first dorsal placed posteriorly, the midpoint of its 

 base being nearer insertion of ventral than that of pectoral; second 

 dorsal opposite the anal. 



A single species is known from American waters. 



PRIONACE GLAUCA (Linnaeus) 

 TiNTOREKA 



Squaivs glancus Linnaeus, 1758, p. 235, European ocean. 



Prionace glauca Jordan and Evermann, 1896, p. 33, pi. 4, fig. 16 (description; 



range; synonymy). 

 Galeus glaucus Garman, 1913, p. 145, pi. 3, figs. 1-3 (synonymy; description; range 



under generic account). 

 Glyphis glaucus Fowler, 1941b, p. 178 (synonymy and references; description; 



range) . 



The Peruvian "tintorera" probably is this species, which is known as 

 the "great blue shark" to many people who speak English. The tenta- 



