260 PROCEEDINGS OF THE ACADEMY OP 



Selachus maximus DeKay, N. Y. F. iv. 357 ; St. Syn. 254. 



Hab. Am. Greenland to New Jersey. 



If there is any actual difference bptween the American and European represen- 

 tatives of this genus, they have not yet been pointed out ; the example of pre- 

 vious authors in referring both to C. maximus is, therefore, still followed. The 

 synonymy of the American fish is alone given. 



ISURW, Gill. 



CARCHARODON A. Smith. 

 Carcharias obscurus Storer. Bn. Journ. ii. 558, (excl. syn.) 

 Oarcharias Atwoodi Storer, Bn. Proc. 1848, p. 72. 



" The first dorsal fin is one foot in length." 



" The second dorsal is one inch long." " The anal fin is one inch long." 



"The upper lobe of the caudal fin measures two feet over its curvature ; the 

 lower lobe measures one foot and a half." 



These measurements of the fish, called by Dr. Storer C. obscurus, are incom- 

 patible with any form of the family of Galeorhinoidee ; the description is only 

 reconcilable with Carcharodon. I had, however, at one time supposed that it 

 might be referrible to Uulamia,* the notice of the dentition, except as to number 

 of teeth (i) in which it agrees with no shark, being vaguely applicable. 



The Carcharias Atwoodi is also probably the same species, the anal being 

 said to be far behind the second dorsal, and thus distinguished from the " white 

 shark." Dr. Storer doubtless obtained his idea of the latter from Yarrell's 

 copy of Belon's figure, which erroneously represents a Carcharodon with the 

 anal opposed to that fin. 



Having been shown a tooth of a Galeoccrdo, said to have been taken from C. 

 Atwoodi, I have asked whether that species could have belonged to that genus, 

 but the position of the anal and the triangular teeth forbid such identification. 



ISTJROPSIS Gill. 



ISUROPSIS GLAUCUS, Gill. 



Lamna punctata Storer, Boston Journ. ii. 534. Rep. 185, pi. 3, fig. 2. 



Not Squalus punctatus Mitch .f 

 Oxyrhina Dekayi Gill, Cat. 60. 

 Isuropsis Dekayi Gill, Squali, 43. An. Lye. N. Y. viii. 153. 



Hab. Mass. ; New York. 



This species of the eastern coast is probably identical with Isuropsis glaucus, 

 said by Muller and flenle to be a native of Java. As it has not. however, been 

 found there by the indefatigable Bleeker, and has been eliminated from the re- 

 cent enumeration of the species of the Archipelago, it is probable that such 

 habitat is erroneous, and that the specimen described was obtained from Suri- 

 nam. Prof. Poey has found apparently the same species at Cuba. 



ODONTASPIDOIDJE Gill. 

 EUGOMPHODUS Gill.J 



EuGOMPHODr/S LITTORAL1S, Gill. 



Squalus americanus Mit., Trans. N. Y. i. 483 (not Shaw.) 



The Carcharias obscurus (Storer) must be considered under two beads: 



1st. The fish mentioned in the report, which is a species of Carcharodon. 



2d. Another individual ident ; fied by Dr. Storer with Carcharias obscurus, and dissected by Dr. 

 Wyman, whose description (Boston Proc. iv. 123, 1851) of its viscera, Ac, indicates th&t it belonged 

 to the Galeorhini. The specimen examined by that accomplished anatomist was doubtless the 

 Eulamia Milberti, and consequently related to the true Carcharias obscurus. 



f'The caudal fin very unequally divided, the upper section being almost thrice as large as th 

 lower, and having a process on the lower side." Hitch. Trans. N. Y. i. 485. 



% Eugomphodus is distinguished from Carcharias (Rat.,) Trigloch\s or Odontaspis by the simple 

 first and fourth teeth of the upper jaw, as well as the first of the lower. The more anterior dor- 

 Mla also separate it from O. taurus. 



[Nov. 



