CETACEA. 69 
*** Dorsal fin posterior, oblong, truncated at the end? Jaws 
; curved up. Diodon, Lesson. 
4. Hyperoopon DesmarestiIl. DEsMAREsT’s HypERoo- 
| DON. 
‘ 
Bichinus Desmaresti, Risso, Europ. Merid. wu. 24. t. 2. f. 3; 
__ F. Cuv. Cetac. 159. 
Le Diodon de Desmarest, Lesson, uv. Buff. i. 124. t. 2. f. 2. 
- Orea (Desmarestii), Wagler, N. S. Amph. 34. 
“Inhab. Nice: common, March and September. 
' “Steel-grey, with numerous, regular, white streaks, beneath 
white; body thicker in the middle; tail slender, long, keeled, 
rounded on the belly; head not sw ollen, ending im a long nose ; 
“upper jaw shorter, toothless, lower much longer, bent up, and 
with two large conical teeth at the end; teeth nicked near the 
: ; the eyes ‘small, oval; blowers large, senile 5 pectoral fins 
short, dorsal rather bey ond the middle of the back, nearly above 
- the vent; the caudal fin broad, festooned. Leneth nearly 16 
meet. It differs from D. Diodon of Hunter in the forehead not 
_ being swollen, and in the lower jaw being produced and bent up, 
_ the pectoral being pointed, the dorsal more obtuse, and the body 
i bemg white-streaked.” 
_ This species is only known by the above account extracted 
ie from Risso. F. Cuvier placed it’ in the restricted genus Delphi- 
nus. Risso appears more correctly to have compared it with 
_ Hyperoodon, but it differs from that genus in several particulars, 
; especially in the form of the for ehead and of the dorsal fin. 
i. Lesson (Tab. R. A. 200) forms of this species, and the Phy- 
_ seter bidens, Sowerby, the subgenus Diodon ! 
i tt Crest of skull thick and close together on the upper edge. 
. 5. HypERoopon LATIFRONS. 
ia Skull large, heavy, solid, the reflexed part of the maxillary 
bones very thick and faerened internally, so as nearly to touch 
~ each of other in front of the blower, much higher than the hinder 
_ part of the skull; lower jaw rather curved up at the top; teeth 2, 
i ‘solid, conical, acute, rather compressed. 
By peroodon latifrons, Gray, Zool. E. & T. 27. +. 4, skull. 
‘ _ Inhab. North Sea. Coast of Lancashire ; Orkneys ; Greenland. 
. a. Skull imperfect. Orkneys. From Mr. Warwick’s collection. 
ty Length of skull (wanting the end) .. 62 inches. 
ve Height of skull behind ............ Ad 5. 
The skull figured in Voyage of the Erebus 8 Terror, tab. 4. 
4 
