43 



lonr/iroslris in general form, but the beak is rather more 

 slender, and the orbits more obliquely truncated in front. 



Steno. Gtai/. 



Head convex. Forehead convex. Beak moderate, ta- 

 pering. Body elongate, fusiform. Pectoral fin moderate, 

 ovate, falcate. Dorsal falcate, in the middle of the back. 

 Skull round, subglobular. Forehead erect. Beak elongate, 

 compressed, higher than broad, tapering in front, convex 

 above. Triangle elongate, deep, produced rather beyond 

 the teeth-line. Palate convex, not grooved on the side. 

 Lower jaw elongate, compressed in front. Symphysis elon- 

 gate, about J the length. 



Tliis is at once known from Lagenorhynchus and Del- 

 phinus by the length, compression, and tapering form of 

 the beak of the skull. 



" * Beak scarcely separated from the forehead.''^ 



The Steno. Steno rostratus. 



Delphinus rostratus, Cuv. Ann. Mas. xix. 9. /?. A. i. 

 •289. F. Cuv. Mam. Lith. t. . Cetac. 156, 1. 10,/. 2, 



not Shaiv. 



Dauphin de Breda, Cuv. Oss. Foss. 278, 296, v. 400, t. 

 21,/. 7, 8. 



Delphinus Bredanensis, "Cuv." Fischer, Syn. 505, 

 from Cuvier. 



D. oxyrhynchus, Jardine, Nat. Lib. t. 27, cop. F. Cuv. 

 Vert. Nederl. Hist. 1829, 236, t. 1, 2. 



D. planiceps, Breda, Schlegel, Ahh. t. 4,/ 8. 



" Forehead gradually shelving to the beak" [Cuv.) ; the 

 skull with the nose as long as the brain-cavity ; teeth 44- 

 |-|-, rather large. Black, lower lip and body beneath rosy 

 white, not separated by distinct lines, lower part of the 

 sides black-spotted. 



luhab. North Sea. Holland, Breda. Brest, D'Orbigny. 



" M. Blainville, who observed a skull of this species in 

 the museum of Mr. J. Sowerby, says it had 22 teeth in 

 each jaw, and the symphysis f the entire length," Desm. 

 Diet. H. N. ix. 160. Now, if this is not a mistake for \, it 

 will at once separate it from the other Stetios. 



** Beak separated from the forehead by a cross groove. 



The Malay Dolphin. Steno Malayanus. 



Delphinus Malayanus, Lesson, Voi/. Coq. t. 9,/. 5. Hist. 

 Cetac. 152. Schlegel, Abh. i. t. 1, 2,/ 2, t. 4,/ 3. 



D. Capensis, Rapp. Cetac. t. 1,f. 1, not Gray or Cur. 



D. plumbeus, Cuv. iJ. J. i. 288. F. Cuv. Cetac. 151. 

 Mam. Lithog. t. 



D. a ventre roux, Voy. Pole Sud, t. 22,/ 2, t. 23,/ 3, 4. 



Grey ash above and below ; nose of skull about | of 

 the entire length ; teeth -fl- 

 Inhab. Indian Ocean. 



Length, entire, 5'llin. 80 in. 



„ of pectoral, .... 11 



Width of tail, 11 1 



The Skull of Dauphin a ventre roux, in the Paris Mu- 



seum, belongs to this species. The nose is very slender, 

 attenuated. Palatal bone and intermaxillaries distinctly 

 seen below ; intermaxillaries very convex, dense ; lower 

 jaw very compressed in front; palate flat, rather convex 

 on each side behind, very spongy. It came from Molucca. 



The skull in the Paris Museum marked D. plumbeus, Ma- 

 labar, Dussumier, also belongs to this species; itmeasures as 

 follows : — Length, 220, beak, 136, teeth-line, 12-0, width at 

 notch, 4'4|^, symphysis of thelower jaw, 5" 6'", teeth, IJ-jt-, 

 large ; beak, elongated, higher than wide, compressed in 

 front ; triangle extending rather before the teeth-lines. Tliere 

 is, in the Anatomical Museum of tlie Jardin des Plantes, 

 also a skull of a fcetal specimen of this species, from 

 Malabar, which is 12 inches long, with the beak 8 inches 

 4 lines long, and 2o wide at the notch. The bones are 

 not united, the u])])er teeth are 36, they are as large as 

 those of the adult skull, and all inclosed in a cartilage, 

 and very close together. From this skull it is evident that 

 these animals are born with the full number of teeth, 

 which only elongate as they gradually develope. The 

 symphysis of the lower jaw is 2" 6'" long. 



The Fronted Dolphin. Steno frontatus. 



Delphinus frontatus, Cuv. Oss. Foss. v. t. 21, f. 7, 8, t. 

 '22, f 8. R. A. i. 288. 



D. Reinwardtii, Schlegel, Abh. i. 21, t. 2,/. 3, 4, t. 4,/ 7. 



Nose of skull about | of its entire length, three times as 

 long as its width at the notch, rather compressed, rounded 

 in front ; lower jaw subangular, and bent up at the end, 

 united about ^ of its length ; teeth ^-^, often rather ru- 

 gose. 



Inhab. Indian Ocean. 



Dimensions of skull in the British Museum. 



Length, entire, 20'6 inches & lines. 



„ of nose, 12"0 



„ teeth-line, lO'O 



Width at notch, 310 



„ at orbit, 7'9 



„ of middle of beak, .... 20 



„ of lower jaw, 17'0 



„ of symphysis, 5'6 



Var. 1. Lower jaw rather straighter below, and rather 

 wider behind, teeth -If- 



Var. 2. Nose much compressed on the side and depress- 

 ed above, rather larger, rather more than three times as 

 long as wide at the notch, teeth, 14- 



Var. 3. Tooth-series rather longer, 10" 6"'; teeth i^, 

 lower jaw like var. 1. 



D. Geoffroyi, Desm. An Inia has been confounded 

 with this species. 



The Compressed-beaked Dolphin. Steno compressus. 



Delphinus compressus, Gray, Cat. Mam. B. M. 



Tab. 27. Skull. 



Nose of skull much compressed, attenuated at the tip, 

 4 the entire length, 2\ times as long as its width at the 



