283 Dominican Fossils — Maury 119 



spects: — the recent has the lobe of the outer lip more produced, 

 the second row of spines much smaller and a third row is intro- 

 duced at the base. Evidently it is the direct descendant of the 

 fossil. The latter also occurs at Bowden. 



Localities. — (Exp'd '16) Bluff i, Cercado de Mao; Zones A, 

 E, G, F, Rio Gurabo at Los Ouemados. 



Strombus bifrons, Sowerby 

 Plate 20, Figures 2, 3 

 Strombus bifrons Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, 



p. 48, pi. 9, fig. 9, 1849. 

 Strombus bifrons Guppy, Quart. Jour., vol.32, p. 287,1866. 

 Strombus pugilis Gabb, (in part) Trans. Amer. Phil. Soc, vol. 15, 



p. 233, 1873. Not pugilis Linne. 

 Strombus bifrons Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 521, 1876. 

 Strombus bifrons Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 176, 177, 



1890; Id. part 6, p. 1584, 1903. 



Sowerby distinguished his unfigured 5. a?nbiguus iiora. bifrons 

 by the absence of rugations on the posterior part of the inner lip 

 of bifrons. But this is not a constant character. Some of our 

 shells have five, three, none, yet evidently are the same species, 

 and closely resemble Sowerby 's figure of bifrons. 



This graceful shell is like the recent Oriental 5. columba. It 

 has a slight resemblance to Toula's 5. gatune?isis, but in that 

 species the spines on the shoulder are obsolete. Of Floridian fos- 

 sil species it seems nearest 5. Aldrichi Dall. Our fossil is also 

 found at Bowden. 



Localities. — (Exp'd '16) Bluffs 1 and 3, Cercado de Mao; 

 Zones A, E, F, Rio Gurabo at Los Quemados; Zone H, Rio Cana 

 at Caimito. 



Strombus proximus Sowerby 

 Plate 20, Figures 4, 5 

 Strombus proximus Sowerby, Quart. Jour. Geol. Soc. London, vol. 



6, p. 48, pi. 9, fig. 8, 1849. 

 Strombus pugilis Gabb, (in part) Trans. Amer. Phil. Soc, vol. 15, p. 



233, 1873. Notpugilis Linne. Exclude other synonyms. 

 Strombus proximus Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 521, 

 1876. 



