3^3 Dominican Fossils — Maury 159 



Localities. — (Exp'd '16) Bluff 2, Cercado de Mao (Very 

 abundant) ; Zone G, Rio Gurabo at Los Ouemados. 



Dentaliiim Cossmannianum Pilsbry and Sharp 



Plate 26, Figure 3 



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



224, 1873. 

 Dentalium Cossmannianum Pilsbry and Sharp, Proc. Acad. Nat. Sci. 



Phila., vol. 49, p. 467, pi, 10, fig. 11; pi. 11, figs. 10, 11, 1897. 

 This is differentiated from our other Dominican shells of the 

 genus by its six longitudinal ridges. Collected by Gabb in 

 Santo Domingo (C. U. Museum No. 7630). 



Dentalium glaucoterrarum , n. sp. 

 Plate 26, Figure 4 



Shell with eight equal, distinct, raised longitudinal ribs, in- 

 tervals slightly convex, marked by irregularly spaced circular 

 growth lines; interstitial riblets entirely absent or extremely 

 weak. Length of fragment 23, diameter of larger end 4, of small- 

 er 3 mm. 



This species resembles D. Cossmanniamim, but has eight in- 

 stead of six ribs. Inasmuch as in recent De?italia the number of 

 ribs is an important character of classification and six and eight 

 ribbed forms are referred to different groups, our fossil would ap- 

 pear to a distinct species. 



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

 mados. 



Dentalium haytense Gabb 

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



1S73. 

 Dentalium haytense Pilsbry and Sharp, Proe. Acad. Nat. Sci., Phila- 

 vol. 49, p. 471, pi. 11, figs. 8, 9, 1897. 



We have a number of very smooth, shining, tapering Den- 

 talia which seem to be this species. No perfect shell has ever 

 yet been found. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. 



