240 DELPHINID^. 



• Beak of skull twice as long as the brain-cavity. Teeth ||-f J. No. 2. 



•* Beak 7nnderate, once and a half the leyigth of the brain-cainty. Teeth 

 iforfa. No. 3. 



C. Skull flattened behind. Triangle to the teeth-line. Palate flat, not grooved 

 on the side. No. 4. 



a. Skidl round. Triangle not reacJiing to the teeth-line. Palate convex, with 

 a very concave litie on the hinder part of each side. Beak twice as long 

 as head. Teeth |^. 



1. Delphinns microps. The Small-headed Dolphin. 



Skull small, subglobular. Palate convex. Nose very long, slender, 

 twice as long as the length of the brain-cavity, nearly four times as 

 long as broad at the notch ; intermaxillaries convex above, with a 

 broad cavity between them in front, rather contracted in front of the 

 blowers. Teeth ^|. Maxillaries very spongy. The triangle in front 

 of the blowers short, not nearly reaching to the line of the hinder 

 tooth. Palate with a prominent ridge extending along its hinder 

 two-thirds. 



Delphinus microps, Gray, Zool, Erebus ^ Terror, 42. t. 25 (skull) ; 

 Cat. Cetac. B. 31. 1850, 126. 



Inhab. Coast of Brazils {Dr. Dicki^. Near mouth of Kio de la 



Plata, Mus. Buenos Ayres {Burmeist^. 



a. Skull ? From the Haslar Hospital. The specimen figured 



in the ' Voyage of the Erebus and Terror,' tab. 25. p. 42. 



h. Skull, larger ; the skull behind the frontal longer, slightly com- 

 pressed. Teeth if on each side. Length, entire, 18 inches ; 

 tooth-line 10|, beak 12, lower jaw 15| ; width at orbit 6|, at 

 notch 3, middle of beak 1|. 



This skull chiefly differs from the type skuU of D. microps in the 

 back of the skull being much less convex, and in its being of a rather 

 larger size : can this depend on the sex of the specimen ? 



Dimensions of five skulls, in inches: the 1st is in the Norwich 

 Museum ; the 2nd, in the British Museum ; the 3rd, in the Museum 

 of the Koyal College of Surgeons ; the 4th, in Dr. Dickie's collection ; 

 the 5th, in the Edinburgh College, n. 164. 



1. 2. 3. 4. 5. 



in. in. in. in. in. 



Length, entire 17| 15^ 15 18 in| 



Length of nose ^ 11 10^ 



Length of teeth-line . . 8 8| 



Length of lower jaw 14| 13 12^ 



Width at notch 2^^ 2| 4 3 



Width at orbits . . 5| 6 



Width of middle of beak .... 2\ 2-^ 1| 2^ 



Width of intermaxillaries .... 8 9 . . 2 



Var. 1. Skull in Mus. Coll. Surg. Edin. n. 164. Barclay Collec- 

 tion. Head smaller, and the nose rather shorter, only once and three- 



