1883.] I'ROF. FLOWER ON THE DELPHINID^. 499 



In the Paris Museum are 12 skulls of this form of Ohjmenia, pre- 

 senting the same diversities of character. They are mostly referred 

 to D. dubitis, Cuvier, thougli it is impossiljle now to say which were 

 the identical specimens upon which lie founded the species. 



One is a very important specimen, the nearly complete skeleton and 

 also the stuffed skin being preserved with it. It belongs to the Sieno 

 attenuatus type, and is named Belphinus brevimanus, Hombron & 

 Jacquinot, ' Voy. de 1' Astrolabe,' Zoologie, 1840, pi. 21. It comes 

 from Malacca. The extreme length of the skull is 405 millim. It 

 is not distinguishable from others marked D. dubius. The vertebrae 

 are: C. 7, D. 1,3, L. & C. 56 = 76, but possibly one or two are wanting 

 from the end of the tail. The general form of the vertebrse is like that 

 of D. delphis. The form and arrangement of the bones of the manus, 

 as figured by Gervais, are exactly like those of 0. marginata {euphro- 

 syne). Another skull of the same form is stated to be from Mada- 

 gascar. Of the broad form {Clymenia doris. Gray), one is called 

 D. dubius, from St. Helena. One called D. frcenatus, F. Cuvier, 

 from Cape Verd, sent by Dussumier, is exactly like the figure of D. 

 doris in ' Zool. Erebus and Terror,' plate 20 ; and another is marked 

 D. frontalis, Dussumier, also from Cape Verd. The under surfaces 

 of these two are figured in Gervais's ' Ostcographie,' pi. xxxviii. figs. 

 4 and 5. The length of different skulls of this group (or species?) 

 in the Paris Museum varies between 383 and 420 millim., and the 

 number of the teeth from 36 to 45 on each side of each jaw. 



D. A fourth distinct form of Olymenia is characterized by a very 

 narrow cranium, along, slender rostrum, and numerous fine teeth, 

 about 50 or more in number on each side above and below. 



The type of this group is Gray's D. longirostris (' Sjjicilegia,' p. 1, 

 1828), formerly in the museum of Joshua Brookes, andnow at Leiden. 

 It was redescribed and figured by Schlegel in his ' Abhandlungen' ; 

 but notwithstanding his clear statement (which I have myself verified 

 by an examination of the specimen) that "die beiden tiefen Rinnen, 

 welche beim gemeinen Delphin auf der Unterseite des Oberkiefes 

 hinlaufen, und sich bis an dessen vorderes Drittel erstrecken, fehlen 

 hier giinzhcli," it was retained by Gray in all his successive lists at the 

 head of the restricted genus Delphimis, characterized by " Palate with 

 a deep groove on each side." This error has caused much confusion, 

 separating it from its nearest congeners, and inducing Gervais to 

 refer to the same species one of the true Dolphins, which is really 

 not allied to it. 



The skull af)pears to be that of a young animal. Its entire length 

 is 425 millim., of which the rostrum occupies 280 ; the greatest 

 breadth of the cranium is 153 millim. ; the width of the rostrum at 

 the base 72 millim. The teeth are very small and slender, about 5C 

 on each side in each jaw. 



The skulls in the British Museum which may be referred to this 

 section are named, according to G-ray's ' Synopsis,' p. 6 : — 

 Ciymenia {Micropia) stenorhyncha. 

 Olymenia (Euphrosyne ) vucrops. 

 Olymenia {Euphrosyne) alope. 



