1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 97 



lu^^A^ 



Vol. VIII, ]¥o. 7. IVashins^ton, D. C. iM«y-»3, 1885. 



the falcate form existing in Delphinus. The rugosities on the upper 

 margin appear to be similar to those which exist in other species of 

 Fhoccvna, and which are most strongly developed in P. spinipinnis. 



In the great number of its vertebrae, as already remarked, P. J)alli 

 shows on important similarity to the Lagenorhynchi. The vertebral 

 formulae of the different species oiPhocccna and of one of Lagenorhynchus 

 are as follows ; 



* Flower, Cat. Osteol., College of Surgeons, pt. ii. 1884, pp. 570 and 582. 



In view of the existence of these three characters in a species other- 

 wise evidently allied to P. communis, it would appear to be necessary to 

 modify the diagnosis of the genus, and to base the latter simply upon the 

 peculiar shape of the teeth and the form and position of the pterygoids. 



Mr. Dall states in his notes that the species under consideration is 

 recognized by the Aleuts as distinct from the smaller bay porpoise or 

 pufiing pig, P. vomerina, Gill {1=P. communis), which is also found about 

 the Aleutian Islands. Thelatter species is called aZ-a-MM, while P. Dalli 

 known as kud ah' -tikli, the word ah-tiikh, as Mr. Dall further exjjlains, 

 signifying whales in general. 



Measurements of the exterior of a specimen of Phoccena Dalli cajitured off AdaJch Island, 



August 13, 1873. 



[These meaaurenients are in straight lines, the curves of the body being excluded.] 



Inches. 



Total length 72.0 



Tip of lower jaw to corner of mouth 3. 5 



Tip of lower jaw to center of eye 7.0 



Tip of lower jaw to ear 9. .5 



Tip of lower jaw to front edge of pectoral ar its insertion 11. 



Tip of lower jaw to back edge of pectoral at its insertion 14. 



Tip of lower jaw to anterior edge of blow-hole 9. 



Eye to spout-hole (vertical) 4. 



Across base of pectoral 5. 5 



Anterior base of pectoral to tip 8. 



Posterior base of pectoral to tip 5. 75 



Tip of lower jaw to anterior boundary of the white area 27.3 



Spout-hole to anterior edge of dorsal 18. .5 



Height of dorsal 6. 



Length of base of dorsal 10.5 



Proc. N. M. 85 7 



