32 BULLETIN 30, UNITED STATES KAITONAL MUSEUM. 



STENO PERSPICILLATUS Peters. 



DdjjilnnuH (Stcno) persplcillatus, Peters, Moiiatsber. tier K. Akiul. Berlin, 187G, pp. 

 :3GU-3(;G, pis. 2, 3. 



The reasons for regardiug this Species as distinct from 8. rostraius 

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

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

 Ocean, in 32° 20' 1" S. lat , 2o V W. long. The measurements ot the 

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

 foregoing table of measurements of S. rostratus (p. 30). 



3. TUPtSlOPS Gervais. 



Tiiraiopti, Gervais, Hist. nat. do3 Mainm., ii, 18.')5, p. 3'23. {Fide Flower.) 



This genus is distinguishable from rrodelphinus pt iMcii)al!y by its less 

 numerous and larger teeth. From Stcno it difl'er.s by reason of its short 

 mandibular symphysis and more numerous vertebra.\ 



The numerous species described by Gray were founded chiefly u^iou 

 single skulls, and their true relationshii)S are, therefore, not readily to 

 be made out. From such evidence as we possess, however, there ajipear 

 to be four species, as follows: Tursiops iiirsio (Fabricius); Tursioi)S 

 catcdania (Gray) 5 Tvrsiops alvsalani (Ikiii)pell) ; Tursio2)s QtUii Da\]. 



Tursiops aduncns, Hemp. andEhrenberg, 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. 



TUESIOPS TURSIO (Fabricius). 



Delpliinus titrslo, Fabricius, Fauna Greenland., I7d0, j). 49. 



Ddjihinus itirsio, Bouuaterre, Cytologic, 1789, p. 21. 



Dcl2>hiiius trtincalus, Montagu, Mem. Weru. Soc, iii, 1821, p. 75. 



Tursio2)s tursio, Gervais, Comp. Rend., 1864, p. 87G. 

 Dclj}hinHS metis, Gray, Zool. Erebus and Terror, 1846, p. 38, pi. 18. 

 Del^^hunis cymodice, Gi'a,y, Zool. Erebus and Terror, 1846, j). 33, i)l. 19. 

 DcJj'^iinus em-ijnome, Gray, Zool. Erebus and Terror, 1846, p. 38, pi. 17, 



riiocwnd conqyrcssicanda, Lesson, Cdtologie, p. 199. 



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

 ined any European specimens, I was inclined to regard the "Pori)oise" 

 of the Atlantic coast of America as specifically distinct from the " 13ot- 

 tlenose" of European waters, 1 Lave 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 otf Hatteras, North Caro- 

 lina (22304 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, 1 shall discuss the series of skuU§ in the ^ational 



