i5 8 Bulletin 29 323 



p. 224. 



Lucapina alternata Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 244, 

 1873- 



Our shells are slightly laterally compressed and narrower, but 

 otherwise appear identical with F. alternata from the Carolina 

 coast. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao (Not 

 common). 



CLASS SCAPHOPODA 



Genus Dentalium Linne 



Dentaliimi dissimile Guppy 

 Plate 26, Figure 1 



Dentalium dissimile Guppy, Quart. Jour. Geol. Soc, vol. 22, p. 292, 



pi. 17, fig. 4, 1866. 

 Cf. Dentalium dissimile Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 



244, 1873. 

 Dentalium dissimile Pilsbry and Sharp, Proc Acad. Nat. Sci. Phila., 



vol. 49, p. 469, pi. 11, figs. 3, 4, 5, 1897. 

 Dentalium dissimile Pilsbry, Idem,, vol. 63, p. 136, 1911. 



Shell with a quadrangular, finely striate apex, becoming 

 smooth, round and shining near the aperture. The type locality 

 is Jamaica. 



Localities. — (Exp'd '16) Bluffs 2 and 3, Cercado de Mao; 

 Zone G, Rio Gurabo at Los Quemados. 



Dentalium dissimile variety pondero sum Gabb 

 Plate 26, Figure 2 

 Dentalium ponderosum Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 244, 



1873. 

 Dentalium dissimile var. ponderosum Pilsbry and Sharp, Proc. Acad 

 Nat. Sci. Phila., vol. 49, p. 470, pi. 10, figs. 1, 2, 3; pi. 11. figs. 15 

 16, 1897. 

 This large, common species often becomes so thickened in- 

 ternally that the cavity becomes a mere perforation. 



