DELPHIXUS. 



243 



near the entrance of the inner iiostiils, is sharply keeled ; and in a 

 the two ridges are rounded. 



I am by no means certain that, with a larger series of skulls in a 

 perfect condition, and with the animals they belonged to, it might 

 not result that there are more than one species amongst these 

 skulls. 



In aU these skulls the intermaxillarics arc seen below, fomiing a 

 slender, elongated, triangular space in the front of the palate, and in 

 some the vomer is also more or less seen in the middle of the palate ; 

 but the absence or presence of this bone in the palate is of very 

 little consequence, as a character, in this Idud. 



Measurements of different skulls in the British Museum, 

 particular locaUties are unknown. 



The 



Delphinua 

 Delphis. 



h 

 c 



d 



e 

 f 



I 

 i 

 k 

 I 



Breadth at the Length of nose ijf^mber 

 commencement as compared to Lf t-ggi-j, 

 width at notch, i 



in. lin. 

 2 9 

 2 9 

 2 3 

 2 2 



2 9 



Cu^ier (Oss. Foss. v. 303) described the cervical vertebrae as fused 

 into a single piece, yet in Anat. Comp. i. 105 he states that in the 

 Dolphins the atlas and axis only are united, the other cervical ver- 

 tebra; remaining separate, though extremely thin. Lesson (Get. 

 p. 22G) describes the first six as quite thin in the D. Delpliis, and 

 the last as somewhat thick. Dr. Jackson, who points out these 

 discrepancies, described the dolphin he examined as ha\ing the first 

 and second cei-vicals scarcely moveable upon each other, and the other 

 five smaller and rather more moveable. — Bost. Journ. N. If. v. 155. 



The vertebrae are thiis enumerated : — 



1. Ciwier, Anat. Comp. i. 103 14 dorsal, 52 posterior. 



2. Ctivier, 0.s.«. Foss. v. 303 l:j „ 47 „ 



3. Lc-ison, CVt.220 1.$ „ 52 „ 



4. Jardine, Cetacen 12 „ 52 „ 



5. ? Jackson, Bost. Journ. N. II. v. 154 .... 14 „ 55 „ 



Dr. Jackson gives the following description of an American speci- 

 men : — 



" Dusky black on the back, white on the belly, and lead-coloured 

 on the sides ; a dusky line from 1 to 2 inches in width commenced 

 a little above the C5"e and passing along the sides was lost in the 



e2 



