32 BULLETIN 36, UNITED STATES NATIONAL MUSEUM. 



STENO TERSPICILLATUS Peters. 



Ddpliinus (Skno) iHrspiciUatun, Peters, Mouatsber. tier K. Akad. Berlin, 187C, pp. 

 060-300, pis. 2, 3. 



The reasons for regardiug this species as distinct from 8. rostrains 

 Lave been given on p. 25. It differs apparently only in external charac- 

 ters. Peters' specimen was a female, and was taken in the Atlantic 

 Ocean, in 32° 20' 7" S. lat , 2° V W. long. The measurements ot the 

 skull of this individual are, for purposes of comparison, included in the 

 foregoing table of measurements of 8. rostrains (p. 30). 



3. TURSIOPS Gervais. 



Tttrsiops, Gervais, Hist. nat. ile3 Mamiii., ii, 18r)5, p. 3'23. {Fide Flower.) 



This genus is distinguishable from Prodelphhius principally by its less 

 numerous and larger teeth. From Sleno it diflVrs by reason of its short 

 mandibular symphysis and more numerous vertebr;x\ 



The numerous species described by Gray were founded chietly upon 

 single skulls, and their true relationships are, therefore, not readily to 

 be made out. From such evidence as we possess, however, there aj^pear 

 to be four species, as follows: Tttrsiops inrsio (Fabricius); Tursio2)s 

 catalania (Gray); Tiirsiops alnsalam (Eiippell); Tvrsiops giUn DaW. 



Tursiops aduncns, Hemp, and Ehrenberg, may or may not prove to be 

 distinct, but as we have not had access to the original description of 

 that species, we venture no opinion regarding it. 



TURSIOPS TURSIO (Fabricius). 



Delpliinus inrsio, Fabricius, Fauua Groenland., 1780, p. 49. 



DeJ_[)hi)iHS iitrsio, Bounaterre, C6tologie, 1789, p. 21. 



Dclpliinm iruncaius, Montagu, Mem. Weru. Soc, in, 1821, p. 75. 



Tursiops tiirsio, Gervais, Coinp. Rend., 1864, p. 870. 

 Dcljylnnm metis, Gray, Zool. Erebus and Terror, 1846, j). 38, pi. 18. 

 Ddplnnus ojinodice, Gray, Zool. Erebus and Terror, 1840, p. 3S, pi. 19. 

 Ddpldnus enrjinome, Gray, Zool. Erebus and Terror, 1846, p. 38, pi. 17. 



Phocana comprcssicanda, Lesson, C6tologie, p. 199. 



At the beginning of my cctological studies, and before I had exam- 

 ined any European specimens, I was inclined to regard the "Porpoise" 

 of the Atlantic coast of America as specifically distinct from the " Bot- 

 tlenose" of European waters. I have since come to regard them as 

 identical. I have examined side by side the skeletons of two old indi- 

 viduals of almost exactly equal size, one from off Hatteras, North Caro- 

 lina (2230i 2 ), and the other from the coast of England (21,151), and 

 find only such differences as appear to me to be due to individual varia- 

 tion. 



Before considering the types of the different species which have been 

 thus far described, I shall discuss the series of skulls in \\xc national 



