138 PALAEONTOLOGY OF CALIFOKNIA. 



shell is from the Martinez Group, while both of the other species are peculiar to 

 the Shasta Group. 



Locality : Martinez Group, Benicia ; found by my lamented friend, Mr. Esmond. 



TURRILITES, Lam. 

 T. Okegonensis, Gabb. 



(T. sp. indet., Gabb; Pal. Cal., Vol. 1, p. 73, pi. 20, fig. 201.) 



At the above place I indicated the existence of the first known species of the 

 genus on the West Coast, but did not feel warranted in naming it from so small 

 a fragment. I have since seen several fragmentary specimens from Oregon, the 

 finest of which is from the Cretaceous deposit on the Crooked Creek of the Des 

 Chutes, the existence of which was made known by the Geological Survey in 1864. 

 The shell is very constant in its sculpture, the spire elevated, and the whorls 

 increase slowly in size. The longest spiral 1 have seen is between two and three 

 inches in length. 



ANCYLOCERAS, d'Orb. 

 A. Remondi, Gabb. 



PI. 23, Fig. 17. 



(Crioceras (Ancyloceras ?) Remondi, Gabb; Pal. Cal., Vol. l,p. 75, pi. 14, fig. 24,24a.) 

 (Ancyloce?-as sp.?, Gabb; loc. tit, p. 78, pi. 15, fig. 30.) 



An examination of the septum of an undoubted fragment of the spiral part of 

 this species, proves beyond question that the opinions I expressed in regard to the 

 straight portion were correct. The species will therefore have to stand under the 

 above name. 



A. percostatus, Gabb. 



PI. 24, Fig. 19. 



(Crioceras percosiaius, Gabb; Pal. Cal., Vol. 1, p. 77, pi. 16, 17, fig. 26.) 



This magnificent species was described from fragments, and in the specimen 

 figured, the outer portion fitted so neatly over the inner volution, that I was mis- 

 led into believing that they were parts of a continuous spiral. Additional material 



