144 BULLETIN -M, UNITED STATES NATIONAL MUSEUM. 



by the palatines, as is also the case in the skull figured by Messrs. Vau 

 lieuedeu aud Gervais (Osteoff., PI. L, fig. la). In a skull in the national 

 collection, now to be described, they are practically in contact. 



Ju examining the skulls of killer-whales in the National Museum, I 

 have found a complete cranium, a maudible, and a beak with the teeth 

 in position, which belong to this species. The cranium was obtained 

 from the Athenasum Museum, Kau tucket, Mass., and is stated to have 

 come from the " northeast coast." Very probably it was originally 

 obtained in Davis' Strait. It closely resembhs the skull of P. c>Yf.vsi- 

 de7is figured by Eeinhardt, both in proportions and details of structure, 

 and differs only in having a somewhat shorter tooth-row. 



In the four skulls in the Royal Oi>llege of Surgeons the proportional 

 length of the tooth-row varies somewhat, being 33.1) per cent, of the 

 total length in one instance, and 3G.7 per cent, in another, so that I 

 do not regard the shorter tooth row of the skull under discussion as 

 worthy of special consideration. 



In the following table are given measurements of this skull, together 

 with Reiuhardt's measurements (reduced to English inches) of the 

 Eefsnies specimen, and as many of Burmeister's measurements of 

 Globiocephalus Grayi (presently to be considered) as may be compared 

 with the former : 



Orca destructor Cope. 



The beak and mandible referred to (No. 3670) are from oif Paita, 

 Peru, and form the basis of Professor Cope's Orca destructor. He states 

 that it differs from P. meridionalis "in the greater breadth and obtuse- 

 uess of the muzzle of its cranium aud mandible — all we possess of it— 



