78 DELPHIN1DJE. 



9. PERES A. 



Orca (Feresa), Gray, P. Z. S. 1870, p. 77. 



The beak of the skull from the notch rather shorter than from 

 the notch to the condyle, depressed, flat above, gradually tapering 

 in front ; the width at the notch two-thirds of the entire length of 

 the beak. Lower jaw slender, narrow and thin in front, teeth not 

 reaching the notch. 



This reexamination has convinced me, and also, I believe, Mr. 

 Flower, that the skull described under the name of Orca intermedia 

 belongs to a very small species, and is not " the skull of a very 

 young individual, probably of one of the large species," as Mr. 

 Flower supposed, apparently from the examination of the figure 

 (see Flower, P. Z. S. 1864, p. 425). Indeed, when the animal 

 is known, I should not be at all astonished if it should prove to be 

 a species of Electra rather than of Orca, or perhaps a new genus. 



This skull has many resemblances to those of some of the species 

 of Electra ; the teeth are much smaller than those of Orca. 



1. Feresa intermedia. B.M. 



Orca intermedia, Gray, Cat. Seals S,- Whales, p. 283 ; Zool. Erebus 

 and Terror, p. 34, tab. 8 (skull) ; P. Z. S. 1870, p. 77. 



Inhab. ? 



This is the skull of a full-grown animal, and yet it is not so 

 large as the skull of a newly born specimen of Orca. Mr. Flower, 

 judging from the figure, believed it to be the skull of a very young 

 animal ; but on examining the skull along with me he became 

 satisfied, from the solidity and definite form of the bones, that it is 

 the skull of a full-grown though not aged specimen. 



10. LEUCOPLEURUS. 



Leucopleurus, Gray, P. Z. S. I860, p. 216 ; Synops. Whales 8f Dolph. 

 p. 7. 



Beak of the skull rather flat above and elongate, bent up on the 

 edge in front of the notch, narrow behind, as long as, or slightly 

 longer than, the length of the brain-case. Teeth-line reaching 

 nearly to the notch. Teeth small, five in an inch. First and second 

 cervical vertebras united by their bodies, third and fourth by the 

 spinous processes. 



Vertebras 81 :— C. 7. D. 15. L. and C. 59. 



1. Leucopleurus arcticus. B.M. 



Leucopleurus arcticus, Gray, Si/twps. Whales &■ Dolph. p. 7, ' t. 6. 



f. 3-5 (fcetusj, t. 12 (skull), t. 20. f. 3 (tongue). 

 Lagenorhynclius leucopleurus, Gray, Cat. S\ $ W. p. 273. no. 9 ; 



Gervais, Osteor/r. Cet. t. 36. fig. 4. 



