28 



tents, of tlic coast of France and Belgium (see Ann. & 

 Mag. N. H. 1846), believing that the difference in the size 

 of the teeth, (which Mr. James Sowerby remarks appear to 

 indicate) to be only a peculiarity produced probably by the 

 age of the specimen, instead of being, as it has proved to 

 be, a distinctive character of the genus. 



I have ventured, in reducing M. De Blainville's tracing, 

 to reverse the position of the skull, as the part now upper- 

 most, appears to me evidently to be the top of the head. 



The Secuelle Ziphius. Ziphius Sechellensis. 

 Tab. Fig. 



Ziphius de Sechelles {M. Le Due, 1839), Mus. Paris. 



The skull is very like that of Delphinus micropterus, 

 but the nose-bones are thicker, heavier and higher. The 

 teeth in the middle of the lower jaw, as in micropterus, 

 but larger and compressed. The hinder part of the lower 

 jaw is very broad, the iront half much narrower and bent 

 down in an arched manner. 



Inhab. Sechelles. 



Exactly like the fossil form, D' An vers. 



Delphinorhynchus, Blainv. part, F. Cur. Delphinus, 

 Desm. Aodon, Lesson. Heterodon, Lesson, Mam. 



Head attenuated, contracted behind. Nose produced, 

 bald, not separated from the forehead. Eyes moderate. 

 Lower jaw fitting into a groove in the edge of the upper. 

 Teeth lew, small or rudimentary, in middle of lower jaw, 

 not developed till late. Throat with 4 parallel slits 

 beneath. Body elongate, rather swollen behind. Pectoral 

 tin low down the side, oval, narrow, small. Dorsal falcate, 

 behind the middle of the body, about f from the nose. 

 Blowers on the crown, curved, with the concavity in front. 

 Tail with 2 falcate lobes, flat, without any central promi- 

 nence. Sexual organs under middle of dorsal. Skull tri- 

 angular. Forehead very high in front and swollen behind. 

 Intermaxillaries curved in front. Nose very long, com- 

 pressed at the hinder end, very nanow, slightly keeled on 

 each side. Hinder wing of the maxilla expanded hori- 

 zontally over the orbits. Nasal boneencased in the frontal 

 and intermaxillaries. Temporal pit very small. Palate 

 smooth. Lower jaw-bones elongate, tapering, slender, 

 nearly straight. 



This genus, which is in character intermediate between 

 Phdanisla and Delphinus, has been confounded with Hy- 

 peroodon by M. F. Cuvier, but it is easily known from that 

 genus, as was pointed out by his brother, by the structure 

 of the skull, which agrees with Delphinus. The ear-bone 

 is attached by an apophysis to the base of the skull. Ver- 

 tebra; 33; 6 cervical separate, 10 costal, 11 lumbar, 11 true 

 caudal. Metacarpal bones cartilaginous. — Dumortier, 

 Mem. Brux. xiii. /. 10. 



This genus has been confounded with Hyperoodon by 

 many of the French authors, but it is easily known from 

 that genus by the head not being rounded in front, and by 

 the teeth being in the middle of the side of each jaw. 



Mr. Bell, following Lesson, has considered this as a dis- 

 tinct genus from Hyperoodon ; but he observes, " whether 

 the generic distinction of the two be correct, appears very 

 doubtful." — Brit. Mam. 499. Blainville, when he first 

 saw the animal on the coast of France, considered it the 



same as Dale's Hyperoodon, and F. Cuvier followed him : 

 but M. Cuvier pointed out, in the ' Regno Animal,' the 

 difference in the form of the skull of the French animal. 



Blainville's Whale. Delphinorhynchus micropterus. 



Delphinorhynchus micropterus, Dumortier, Mem. Acad. 

 Bru.t. xii. /. 1—3, good. F. Cuv. Cetac. 114, t. 9,/. 1, not 

 good, t. 7, skull. 



Delphinus micropterus, Cuv. Reg. An. i. 288. 



Heterodon Dalei, Lesson, Mam. Mem. 419, from Blain. 



Dauphin de Dale, Blainv. N. Bull. Soc. Phil. 1185. 329, 

 F. Cm: Mam. Lith. t. bad. 



Teeth none ; body deep ash, beneath white (\\'hen alive 

 brownish ash-colour, belly whitish ash) ; forehead taper- 

 ing; dorsal fin |, pectoral fin f, from end of nose; blowers 

 before the eyes. 



Inhab. Coasts of Europe. Havre, 1825, Blainv. Os- 

 tend, 1835, Dum. 



M. Dumortier found, near the middle of each side of 

 the lower jaw, a large alveolus, as if for a tooth. His fi- 

 gure represents the pectoral as ^, and the dorsal as 4- from 

 the end of the nose. 



b. Upper and lower jaw with few or deciduous teeth. 

 Wings of the ma.villary hones expanded and shelving 

 downicards. The beak short, dejie.red. Forehead con- 

 re.v. Head rounded, without any beak. Monoceratina. 



Synopsis of the Genera. 



a. Lower jaw toothless. 



1. MoNODON. Upper jaw of males with one or two very 

 long, projecting, spirally twisted tusks. Dorsal none. 



" 2. Anaknachus. Upper jaw with two small, conical, 

 slightly curved, blunt teeth in front, dorsal none." 



b. Upper and lower jaw with conical, early decidttous 

 teeth. 



3. Beluga. Dorsal fin none. 



c. Upper and lower jaw with compressed, permanent 

 teeth. 



4. Neomeris. Dorsal none. 



5. Phoc^na. Dorsal triangular, in the middle of the 

 back. 



