286 MEMOIRS OF THE CARNEGIE MUSEUM 
ae * ~ 
Fic. 2. Protostega gigas. Carapace less the nuchal and the marginal series. Inner view. 1-10, the first to tenth 
ribs respectively ; s, the first sacral. Ten dorsal, the two sacral, and the first of the caudal centra are shown. (A trial 
drawing preparatory to mounting of specimen. About one-eighth natural size. ) 
This greater breadth is quite characteristic of Cretaceous turtles, and a distinct ap- 
proach to a quite orbicular form like that of Lytoloma.” It is a form, moreover, that 
well accords with the powerful and widely expanded flippers now to be described. 
I]. Tur Front Fiiprer. 
(Plates XXXI. and XXXII., with Figs. 3 and 4.) 
The shoulder-girdle of Protostega is robust but presents no strongly marked 
peculiarities, save the elongate coracoid which extended back to the pubis as 
in Hretmochelys, but not either Chelone or the long-bodied Dermochelys. The 
10 Wieland, “Structure of the Upper Cretaceous Turtles of New Jersey : Lytoloma,’’ Amer. Jour. Sci., Vol. XVII., 
September, 1904. 
