410 
ACTIXOPTERTOII. 
with a transverse diameter of 0'035 at its base where the vomerine 
teeth are implanted, but more slender than the rostrum of P. nitida; 
transverse section a depressed oval throughout; surface ornamented 
with conspicuous longitudinal rugse, in part reticulated. 
Form. Sf Loc. Upper Cretaceous (Niobrara Group) : Kansas, 
U.S.A. 
Not represented in the Collection. 
The following specimens of Protosphyrcena are not specifically 
determined :— 
40395. Imperfect, abraded rostrum, much elongated and either 
depressed or compressed; Chalk, Burham, Kent. 
Purchased , 1867. 
47291. Imperfect, crushed rostrum, much elongated and depressed, 
exhibiting remains of an external ornament of fine longi¬ 
tudinal rugae ; Grey Chalk, Dover. Gardner Coll. 
P. 7243-44. Nine jaw-fragments; Cambridge Greensand, Cam¬ 
bridge. Jesson Coll. 
P. 1796. Fragment of premaxilla; Gault, Barnwell, near Cam¬ 
bridge. Eyerton Coll. 
30258, 35131, 35437, 40356. Teeth; Cambridge Greensand. 
Purchased , 1855, 1859, 1867. 
47961. Five teeth ; Cambridge Greensand. 
Presented by Hon. Robert Marsham , 1877. 
P. 7245. Three imperfect large teeth; Cambridge Greensand. 
Jesson Coll. 
32392. Tooth; Upper Greensand, Kilmerton, Isle of Wight. 
Purchased , 1857. 
35675. Tooth; Red Chalk, Speeton, Yorkshire. Bean Coll. 
47225. Ten teeth ; Gault, Folkestone. Gardner Coll. 
36111. Tooth ; Grey Chalk, Dover. Purchased, 1861. 
P. 406. Tooth ; Grey Chalk, Dover. 
Presented by the Earl of Dude, 1881. 
47247. Three teeth ; Chalk Marl, Dover. Gardner Coll. 
