36 



form of tlic Ijrain-cavily and form of tlic beak, the skull of 

 L. Electrii, but it differs from it in tlie beak being rather 

 more acute in front and more contracted on tlie middle of 

 the sides, and in being rather smaller in size. It may only 

 be a variety of that species. 



Skull, length entire .... 16'9 inches & lines. 

 „ of nose .... 9'0 



„ of lower jaw 12"6 

 Width at orbit .... 8-9 



„ at notch .... 4"9 



„ middle of beak 3.4 



The EscHRiCHTS. Lagenorhynchus acutus. 



Delphinus acutus, Gray, Spec. Zool. 1, 2, from a skull. 



D. Eschrichtii, Schleyel, Abh. 2.3, t. 1 k %f- 4, t. 4,/. 5. 



Body ? 



Teeth 44 i nose of skull half its length and nearly twice 

 as long as wide at the notch ; lower jaw obliquely truncat- 

 ed in front. 



Inhab. North Sea, Faroe Islands, Eschricht. 



Skidls and skeleton in the Leyden Museum — 



Length entire 7 2 inches and lines. 



„ of skull 16 



This species was first described by me from a skull in 

 Brooks' museum, which is now at Lcydcn, and Mr. Schlegel 

 has described it from a skeleton sent from the Faroe Is- 

 lands. It differs from the other species of the genus in the 

 nose of the skull being more slender and the teeth more 

 numerous. The teeth series, as in L. Electra and L. Asia, 

 do not reach to the notch which separate, the beak of the 

 skull from the brain-cavity. 



Professor Eschricht informs me this species is very like 

 1). leiicopleurus. 



Delphinapterus, part. Blainv. not Lacep. 

 Delphinus, Lacep. 



Head rather convex, shelving towards the nose. Nose 

 rather produced, obscurely divided from the forehead. 

 Dorsal fin none. Back rounded. Pectoral oblong, rather 

 slender. Skull moderate. Beak broad, depressed, tapering, 

 rounded above. The triangle before the blower, elongate, 

 extending nearly to the middle of the beak. Palate flat. 

 Teeth conical, tapering, acute, curved. Symphysis of the 

 lower jaw short. 



The Peron. Delphinapterus Peronii. 

 Tab. 15. 



Delphinus Peronii, Lacep. 



Delphinapterus leucorhamphus,PeroH, Lesson,Voy. Coq. 

 i. 9, /'. 1, cop. F. Cuiier, Cetac. t. Jardine, N. 



Lih.\. Cuv. Oss. Fosn. v. t. 21,/. 5, 6, skull. 



D. bicolor, Stephenson, MSS. Icon. ined. 



Teeth |4 -jS j black ; beak, pectoral fins, under part of 

 body white. 



Skull in Mus. Paris. Length 18.3, of beak 10.0, of teeth 

 line B'G, of lower jaw 14'6. Width at orbit 90, at notch 

 4'7, at middle of beak 2'7 ; teeth i|, small, slender, six in 

 an inch ; beak broad, depressed, rather tapering in front, 

 the sides spongy, the centre hollow, filled with cartilage. 



broader in front, flattened behind ; triangle extending 

 nearly to the middle of the length of the beak ; orbit rather 

 shelving above and slightly thickened on the edge; palate 

 flat in front, rather convex behind, without any groove on 

 the sides; lower jaw gradually tapering, angularly shelving 

 and flat on the sides in front ; symphysis short, not two 

 inches. 



There is a second skull, brought by M. Eiousard, in 

 1822, which is rather more depressed in the middle in 

 front, and with the triangle reaching near to the middle of 

 the beak ; teeth ^4' lengtli entire, 17'6, of beak Q'G, of 

 lower jaw 14*6, width at notch 4'3, at middle of the beak 

 2'6. Orbits rather shelving above and slightly thickened 

 on the edge. 



Cuvier justly observes the beak of Lesson's ( Voy. Coq. t. 

 9) figures is too pointed. Lesson also represents the 

 black as only occupying the upper part of the back, as re- 

 presented in figure 4, copied from his plate. 1 have 

 therefore given a new figure of the species, copied from a 

 drawing, -^ the natural length, kindly given to me by W. 

 AVilson Saunders, Esq., of Lloyd's, which was made by 

 Dr. Stevenson, during the voyage of the ship Glenarn, 

 Capt. Guy, inlat. 46° 48' S., long. 142° west, Jan. 12, 1844. 



Delphinus, Linn. Delphinorhynchus, part. Lesson. 

 Cephalorhynchus, F. Cuv. 



Forehead rounded. Nose produced, bald. Dorsal fin 

 falcate, in the middle of the back. Skull with the hinder 

 wings of maxilla horizontal, sometimes thickened on the 

 edge over the orbit. Nose elongate, tapering, depressed, 

 broader than high, convex, roundish above, and slightly 

 concave in front of the blowers, nearly parallel on the 

 sides and rounded in front. Teeth small, conical, extend- 

 ing the greater ]iart of the length of the jaw. 



Most maritime persons call these animals Bottle-noses, 

 Bottle-heads, Flounder-heads, Grampuses, Porpoises or 

 Porpusses, sometimes adding Whale to the name. They 

 generally confine the name of Dolphin (most used by lands- 

 men) to the Scomberoid fish {CoryphcBna), which changes 

 colour in dying. 



A. Head shortly leaked. Nose of skull moderate. Tri- 

 angle elongate, produced before the teeth line. Palate 

 flat. 



* Beak scarcely produced. Nose of skull rather depress- 

 ed, scarcely longer than the brain-cavity. Cephalorhyn- 

 chus, F. Cuv. 



The Hastated Dolphin. Delphinus Heavisidii. 



Delphinus Heavisidii, Gray, Spic. Zool. t. 2, /. 6. 

 Schlegel. Abh. t. 3,/. 1—4, t. 4,/. 6. 



D. Capensis, Cuv. R. A. 289. 



D. Dussumieri, Fischer. 



D. Cephalorhynchus, F. Cuv. Cetac. 158. 



Marsouin du Cap, F. Car. Mam. Leth. 3. 



D. hastatus, F. Cuv. Cetac. 161. Bapp. Cet. t. 3. 



Ph. Hora( i, and D. tridens, A. Smith. 



Black, with a streak, and two diverging white lines be- 

 neath ; teeth ^\ ; nose of skull nearly- half the length of 

 head ; lower jaw truncated in front. 



Inhab. S. Sea, Cape of Good Hope. 



