25 



c. Wing of the jaw-bone and beak shelved downwards. 

 Monocerina. 



Having, since the above table was in type, had the op- 

 portunity of examining the skulls oi Ziphius Inia, &c., I 

 am induced to pi-oposo the following arrangement as more 

 consistent with their natural distribution : — 



A. Jaws tapering, the syniphysis of the lower jaw short 

 (not half the length of the jawj. Dorsal fin generally 

 distinct. Marine. 



a. Upper jaw toothless, lower jaw with only one or two 

 teeth on each side, often hidden in the gums. Beak 

 of skull keeled or winged on the side. Hyperoodon- 

 tina. 



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

 Wings of jaw-bone shelving downwards. Monocera- 

 tina. 



c. Upper and lower jaw with many teeth. Wings of 

 jaw-bone horizontal. Delphinina. 



B. Jaws much compressed, the symphysis of the lower 

 very long, more than half the length ; dorsal none ; teeth 

 in both jaws. Fluviatile. 



d. Wings of jaw-bone bent up in front. Platanistina. 



e. Wing of jaw expanded. Iniina. 



A. Jaws tapering, the symphysis of the lower jaw short, 

 not half the length of the jaw. Dorsal fin generally dis- 

 tinct. Pectoral fin orate acute. Marine. 



a. Upper jaw toothless, lotcer jaw with only one or two 

 teeth (which arc often hidden in the gums) on each 

 side. Beak of the skull keeled on each side, the keel 

 being sometimes large, and, forming a large kind of 

 refiexed wing on each side. Hyperoodontina. 



Synopsis of the Genera. 



1. Hyperoodon. — The beak of the upper jaw with a 

 large erect wing-like expansion in front of the blowers, 

 lower jaw with two rudimentary teeth in front. 



2. Ziphius. — Beak of upper jaw keeled on each side, 

 lower jaw broad, with large compressed teeth in the mid- 

 dle of each side. 



3. Delphinorhynchus. — Beak of upper jaw keeled on 

 each side, lower jaw with two or three small, rudimentary, 

 conical teeih in the middle of each side. 



Hyperoodon, Lacep. 



Delphinus, part, Lacep. Uranodon, Illiger. Nodus, 

 Wagler. Aodon, Lesson. Cetodiodon, Jacob. 



Upper jaw toothless ; lower jaw with a small, conical, 

 acute, rudimentary, moveable tooth, in a cavity under the 

 gums, on each side of the front part. Blowers linear, 

 transverse, sub-lunate. 



According to Voight and Wesmael, the ends of the blow- 

 ers, as in other Dolphins, point forward. Dale, Baussard 

 and Doumet describe them as pointing backwards; Des- 

 marest and others assumed the latter as a generic charac- 

 ter. Illiger's genus, Uranodon, depends on the hard sharp 

 points said to be found in the palate by Baussard. Wes- 

 mael did not find them in his specimen. 



This genus is at once known from Delphinorhynchus, 

 without examining the skull, by the head being more con- 

 vex and rounded in front, and the two teeth being situated 

 in the front end of the lower jaw, while in that genus they 

 are in the middle of each side. 



The descriptions of the species of this genus are so dif- 

 ferent, that I am inclined to keep them distinct, for the 

 purpose of calling attention to them. Cuvier regarded 

 them all as one. 



* Dorsal fin in the centre of the back. Hyperoodon, Lacep. 

 Uranodon, Illiger. 



The Bottle-head. Hyperoodon Butskopf. 

 Tab. 



1. Hyperoodon Butskopf, Lacep. Cetac. 319; from 

 Baussard, Jour. Phys. xxxiv. 201, t. copied F. Cuv. 

 Cetac. 2il, t. 17,/. 1, t. 11,/. 1, cop. 



Delphinus ? edentatus, Schreb. Saugth. t, 347. 

 D. Hyperoodon, Desm. Main. 521. 

 D. Honfloriensis, Desm. 

 D. Butskopf, Bonnat. 25. 



2. Bottle-head, or Flounder's Head, Dale, Hist. Har- 

 wich, 411, t. 149, cop. 



Beaked Whale, Penn. Brit. Zool. t. 



Black, beneath lead-coloured ; dorsal fin central ; lower 

 jaw with 2 pointed teeth in front, sunk in the gums; "pa- 

 late with acute hard points ;" blowers transverse, lunate, 

 with the convexity in front. 



Inhab. North Sea. Harwich, Dale. 



Baussard. 

 Adult. Young. 

 23-6 ft. 12-6 ft. 

 0-5 

 4-4 111 



1-4 

 20 10 



Dale. 

 Female. Male. 

 13 ft. 18 ft. 



Length, entire, 



„ of beak, ... 



„ to blower ... 



„ of head, ... 



„ of pectoral, 



„ to dorsal fin, 13"6 7'8 



Length of dorsal fin, 2-0 I'O 



„ to vent, 7' 10 



Width of pectoral, 1-3 T 



„ of caudal, .... 6-10 3-2 



Circumference, .... 15'7 S'O 



„ of head, 8*7 



Height of dorsal, .... 13 7. 



Lacepede called the genus Hyperoodon, and Illiger 

 Uranodon, because of the teeth on the palate described by 

 Baussard. They have not been observed on the other spe- 

 cimens ; and Illiger, in his generic character, by mistake 

 says the two teeth are in the upper jaw, {Gen. 143). 



'Heterodon Dalei (Lesson), is not from Dale's, but from 

 Blainville's account oi Delphinorhynchus micropterus. 



Lacepede placed this species as the type of his Hyper- 

 oodon, and refers Delphinus bidentatus to Delphinus? 



F. Cuvier considers Hunter's and Baussard's as incontes- 

 tibly the same species, taking no notice of the position of 

 the dorsal [Cetac. 242). Dale does not mention the teeth, 

 but they are only to be seen when the flesh is removed. 



H 



