1883.] PROF. FLOAVER ON THE DEM»HIN1D.«. 497 



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

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

 appear to be ever more numerous than 3.3. 



Perhaps Delphimts leucorhamphus 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 Britisli-Museimi 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 ohscura, 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 Clymenia is represented by three 

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

 euphrosyne, 'Erebus ' and ' Terror,' " = " Clymenia euphrosynoides, 

 Supp. Cat. Seals and Whales, p. 71 ; " the other, " Clymenia 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 INIuseum, the following four species in Gray's 

 ' Synopsis ' and ' Supplement' are founded : — 



Clymenia {Micropia) enphro&yne. 

 Clymenia {Micropia) styx. 

 Clyinenia {Clymenia) euphrosynoides. 

 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 Belphinus 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 osteological characters are well known, 

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

 described by 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 lensth, and has — 



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 Belphinus 

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

 le C. marginata." 



The single skull from the Mediterranean upon which Gervais 

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

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



* " Cetaces du Sud-Ouest de la France " (Actes de la Soc. Linn, de Bordeaux, 

 sxxv. p. 150, 1881). 



