367 Dominican Fossils — Maury 103 



Murex compactiis Gabb 

 Plate 16, Figure 8 

 Murex (Pteronotus) compactiis Gabb, Trans. Amer. Phil. Soc., vol. 15, 



p. 202, T873. 

 M. compactus Dall, Trans. Wagner, Inst., vol. 3,pt. 1. p. 142. Not 

 textilis Gabb. 



M. compactus has much the general aspect of M. incisus 

 Broderip living on the west coast, but the varices of the fossil 

 species are more ornate. Our shell is a metatype sent by Profes- 

 sor Gabb from Santo Domingo. 



Murex {Phyllonotus) cornurectus Guppy 

 Plate 16, Figures 9, 10 

 M. {Chicoreus) megacerus Gabb, Trans. Amer. Phil. Soc, vol, 15, 



p. 202, 1873. Not M. megacerus Sowerby. 

 M. cornurectus Guppy, Quart. Jour. Geol. Soc. London, vol. 32, p. 521, 

 pi. 28, fig. 4, 1876. 



Our fossils fall into two groups: — (1) larger shells, identical 

 with those sent by Gabb as M. megacerus, and exactly like speci- 

 mens from the Monte Cristi beach; (2) smaller shells identical 

 with Guppy' s M. cornurectus, but also apparently the same as the 

 larger shells. Dr. Dall on being asked whether both should be re- 

 ferred to brevifrons, replied that it would be better to call them 

 cornurectus since, "the question of what brevifrons really is, needs 

 study. I feel there may be more than one species In the series 

 called brevifrons." 



Localities. — (Exp'd '16) Bluffs 1, 2, 3, Cercado de Mao 

 (abundant in 3); Zones D and F, Rio Gurabo at Lx>s Quemados; 

 Zones H and I, Rio Cana at Caimito; Cerro Gordo to Mao road, 

 and Guayubin to Mao road. 



Murex {Phyllonotus) prcepauxillus , n. sp. 

 Plate 16, Figure n 

 Shell with seven whorls, the first two smooth, nuclear, later 

 whorls with low crenate varices, six to a whorl, and three main, 

 crenate ridges revolving around the periphery. The uppermost 

 spiral of each trio carinates the whorl, and on crossing the vari- 

 ces forms short, hollow spines; aperture narrowly elliptical; canal 



