i34 Bulletin 29 298 



Localities.— (Exp'd '16) Zone E and F, Rio Gurabo at 

 Los Ouemados. 



Xenophora delecta, Guppy 



Plate 23, Figures 8, 9 



Phorus delectus Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 529, 1876. 



Xenophora dilecta Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 6, p. 1585. 



This shell is easily distinguished from X. conchyliophora by 

 its strikingly ridged upper surface and rows of granules on the 

 under surface. Guppy' s type was one of Heneken's Dominican 

 shells, but it also occurs at Bowden. 



Localities. — (Exp'd '16) Bluff 1, Cercado de Mao; Zone F, 

 Rio Gurabo. 



Xenophora ( Turguriuvi) imperforata Gabb 

 Onustus imperforatus Gabb, Trans. Amer. Phil. Soc,, vol. 15, p. 241, 



1873. 

 This shell can be immediately recognized by the prolonga- 

 tion of the periphery into the blade-like flange characteristic of 

 Turgurium. On comparing it with the recent Antillean T. cari- 

 bce Petit, of which we have a metatype from Petit, the fossil is 

 seen to be broader, natter and more coarsely striate. 



Locality. — (Exp'd '16) Zone F, Rio Gurabo at Los Que- 

 mados. 



Genus Nattca Scopoli 

 Natica canrena (Linne) Moerch 



Plate 23, Figure 10 

 Nerita canrena (Linne in part) Auct., Morch, Malak. Blatt. 24, p. 62, 



1877. 

 Natica canrena Gabb, Trans. Amer. Phil. Soc., vol. 15, p. 223, 1873. 

 Natica canrena Guppy , Quart. Jour. Geol. Soc, vol. 32, p. 518, 1S76. 

 Natica canrena Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 2, p. 364-365, 



1892. 

 Natica can'rena Brown and Pilsbry, Proc. Acad. Nat. Sci. Phila., p. 



508, 1912. 

 Shell easily distinguished by the characteristic tangential 

 plicae adjoining the suture. It is a widespread and ancient 

 species, ranging from the Oligocene to the recent, found in Flori- 

 da, North Carolina, Costa Rica, Trinidad and at Gatun. It is 



