1905-6.] On Delphinus acutus from Coast of Sutherland. 31 7 
rod but no centre of ossification in it.* The nranus, owing to the 
animal not being adult, presented an interesting study of the 
progress of ossification in this species of Dolphin. The following 
formula represents the osseous elements of the nranus : — 
Pol. 
lx Me 
An 
Mi 
Phal. ? 
8 5 
3 
2 
Met. 1 
1 1 
1 
1 
Ox 
C 2 and C 3 
C 4 and C 5 
radiale 
intermedium 
ulnar e 
Radius Ulna 
Owing to the absence of ossific centres the phalangeal formula, 
in the pollex and minimus cannot be stated in this specimen. 
The species Delphinus acutus was established in 1828 by J. E. 
Gray, from the examination of a skull from Orkney, now in the 
Museum at Leyden, which skull he figured in the Zoology of the 
voyage of the Erebus and Terror , Plate 12. Other specimens 
were subsequently obtained from the Faroes and the coasts of 
Norway (Rasch) and Holland, which have been at various times 
named Delphinus eschrichtii (Schlegel), Delphinus leucopleurus 
(Rasch), Lagenorhynchus leucopleurus (Gray), Lagenorhynchus 
acutus (Flower), but their identity with D. acutus is now 
recognised. 
In 1835 Robert and Frederick Knox obtained from Orkney a 
female dolphin, which measured 6 feet 5J inches.! They named 
it Delphinus tursio , and they prepared the skeleton. The 
vertebral formula was C7, D 15, LC59 = 81. The cranial cavity 
was opened and the brain removed. Dr J. E. Gray stated 
(' Catalogue of Whales , p. 274, 1866) that this specimen was in the 
Museum of the University of Edinburgh, and he assigned it to 
the species Lagenorhynchus leucopleurus. As the museum referred 
to by him might have been the Natural History Museum of 
* I may refer to my account of the Anatomy of Sowerby’s Whale, Journ. 
Anat. and Phys., Oct. 1885, and to my description of Balcenoptera rostrata, 
Proc. Roy. Soc. Edin., Feb. 1892, for a critical examination of the con- 
stitution of the manus in the Cetacea. 
t Measurements of the skull, skeleton and other characters of this dolphin 
are given in Knox’s Catalogue of Anatomical Preparations illustrative of th& 
Whale , Edinburgh, 1838 ; also in Proc. Linnean Soc., Zoology, 1857, p. 67. 
