CuTACHA! 117 
art of the skull of the latter is also rather more convex than the 
ame part in D. Pherusa. : 
In the description of this species in the Zoology of the Erebus 
nd Terror, D. Metis is mentioned in three places instead of D. 
Joris. 
13. Detepuinus Styx. The Sryx. 
_ Skull roundish, rather flattened behind; nose rather depressed, 
rather convex in the middle, shelving on each side, rather longer 
than the head, $ the entire length, nearly twice and a half as long, 
as the width at the notch; the triangular impression just to the 
ine of the hindermost teeth; teeth 42, slender, subcylindrical, 
acute, about five in an inch; palate nearly flat; lower jaw rather 
produced and rounded in front. 
D . Styx, Gray, Zool. E. & T. 40. t. 21, skull. 
Inhab. W. Africa, Capt. W. T. W. Owen, R.N. 
_ Skull in Mus. United Service Institution. 
in. lin. 
Length, entire........ 18 0 
ne GEMORGY oh,as's ee: 
x of lower jaw... 14 9 
Width at the notch ... 4 6 
oo eG ONG sie 5x0 
91 als ti I pl a lan 42 
This species is very ike D. Euphrosyne, but is rather smaller 
and the beak rather shorter: it may prove only a variety. 
14. DELPHINUS EUPHROSYNE. The EUPHROSYNE. 
_ Skull round, rather flattened behind; nose rather broad and 
rather tapering in front, depressed, flat at the base, shelving on 
‘the sides and rounded in the middle above, about half as long 
again as the head, or 2 the entire length, and 23 times the length 
‘of the width at the notch; teeth 43, slender, elongate, slightly 
‘curved, acute. The intermaxillaries are convex and rounded 
above, with a wide groove between them for half their length in 
ront. 
Delphinus Euphrosyne, Gray, Cat. Ost. Spec. B. M. 147; Zool. 
_ Ereb. & Terror, 40. t. 22, skull; Nilsson, Skand. Fauna, i. 595. 
D. Styx, pars, Gray, Cat. Osteol. Spec. B. M. 38. 
D. Holbdllii, Eschricht, Naturf. mot i Kopenh.1847, fide Nilsson. 
hab. North Sea. 
Skull, Mus. Norwich: Length, entire ...... 18 6 
% ab Obhead: Ji. ge! 4 
5¢ roinpse-u, kth <2 
