240 DELPniNID^. 



* Beak of skull twice as Imu/ as the brain-carih/. Teeth ^|-fg^. No. 2. 



** Beak moderate, once and a Judf the lemjtli of the hrain-cavity. Teeth 

 4 s Q.. 5 TVo ;} 



4 6"' « U ■ ^^^- '• 



C. Skull flattened behind, Trianc/Ie to the teeth-line. Palate flat, not (jroored 

 an the side. No. 4. 



a. Skull round. Triangle not reaching to the teeth-line. Palate conve.r, tvith 

 a very concave line on the hinder jMrt of each side. Beak ticice as long 

 as head. Teeth ||. 



1. Delphinus 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, M. 1850, 126. 



Inhab. Coast of Brazils (Dr. Dickie), Near mouth of Eio de la 

 Plata, Mus. Buenos Ayres (Burmeister). 



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



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



b. SkuU, larger ; the skull behind the frontal longer, slightly com- 



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

 tooth-Une 10|, beak 12, lower jaw 15| ; width at orbit 0|, at 

 notch 3, middle of beak 1|. 



This skull chiefly diff'ers from the type skull of D. microjJS 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 Royal 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 16| 



Length of nose 9| 11 10| 



Length of teeth-line . . 8 8| 



Length of lower jaw 14| 13 12| 



Width at notch 2JL 2| 4 3 



Width at orbits . . 5| 6 



Width of middle of beak .... 2^ 2-^ i| 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, onlj' once and three- 



