1883.] PROF. FLOWER ON THE DELPHINID^. 497 



and unique specimen, but they appear to have exceeded 40 in number 

 on each side of each jaw; whereas in C. ohscura they do not 

 appear to be ever more numerous than 33. 



Perhaps Velphinus leucorhumphus of Peron, or Leucorhamphus 

 peronii, Lilljeborg, belongs to this group. It is a Dolphin from the 

 South Seas, remarkable for the absence of a dorsal fin. It is not 

 represented in the British-Museum collection ; but a skull in the 

 Museum of the College of Surgeons, which I believe to belong to this 

 species (as it agrees with one so called in the Paris Museum), is not 

 unlike that of Clymenia obscura, having a rostrum broad at the base, 

 and gradually tapering and much depressed. It is of larger size, 

 and the teeth are very small and numerous. Without a knowledge 

 of its skeleton, it is difficult to assign its exact position, or decide 

 whether the absence of dorsal fin entitles it to generic distinction. 



B. Another distinct form of Chpnenia is represented by three 

 skulls in the British Museum. Of these two are marked " Delphinus 

 euphrosyne, 'Erebus ' and ' Terror,' "^" Chjmenia euphrosynoldes, 

 Supp. Cat. Seals and Whales, p. 71 ; " the other, " Cly7nenia dorides, 

 Supp. Cat. Seals and Whales, p. 71." "Styx'" is also written upon 

 the label of the latter. 



Upon these specimens, one in the Norwich Museum, and another 

 in the United-Service Museum, the following four species in Gray's 

 ' Synopsis ' and ' Supplement' are founded : — 



Clymenia (Micropia) euphrosyne. 

 Clymenia (Micropia) styx. 

 Clymenia {Clymenia^ euphrasy noides. 

 Clymenia (^Clymenia) dorides. 



In all these the teeth vary from 40 to 46 on each side of each jaw. 

 The anterior nares are very small, with a large flat space in front. 1 

 am not able to detect any difference of specific importance between 

 them, and am inclined also to include with them Delphinus mar- 

 ginatvs, Duvernoy (in Pucheran, Revue et Mag. de Zoologie, 1854, 

 p. .547), described from two individuals taken at Dieppe, and 

 of which the external and osteologicai characters are well known, 

 one of the skeletons being mounted in the Paris Museum. It is 

 described hy Fischer \ and parts of it figured in Gervais's 'Osteo- 

 graphie.' The skeleton is very like that of D. delphis. The verte- 

 bral formula is C. 7, D. 15, L. 22, C. 32, total 76. It belongs to a 

 quite adult animal. The skull is 460 millim. in length, and has i^ 



teeth, the antero-posterior diameter of the largest of which is 3 millim. 

 The animal was 2'090 metres in length. 



After describing the skeleton, Fischer remarks, " Le Delphinus 

 euphrosyne, Gray, de la mer du Nord, est peut-etre identique avec 

 le C. marffinata." 



The single skull from the Mediterranean upon which Gervais 

 founded D. tethyos, now in the Paris Museum, is so similar that I 

 should be disposed to include it also, at all events until some distinc- 



^ " Ceta«es du Sucl-Ouest de la France " (Actes de la Soc. Linn, de Bordeaux, 

 Txxv. p. 150, 1881). 



