io2 Bulletin 20 266 



pi. 10, fig. 5, 1849. 

 M. Domingensis Guppy, Quart. Jour., vol. 22, p. 28S, 1866. 

 M. Domi?igensis Gabb. Trans. Arner. Phil. Soc, vol. 15, p. 201, 



1873- 



M. domingensis Dall, Trans. Wagner Inst. Sci.,vol. 3, pt. 6, p. 

 1584, 1903. 



M. recurvirostris domingensis Brown and Pilsbry, Proc. Acad. Nat. 

 Sci. Phila., pp. 353—354, I9 11 - 



Closely allied to this species is M. yaqnensis {antillarum 

 Gabb, name preoccupied). That typically is high spired, slender, 

 fusiform, while M. domingensis has a broad ovate form, a low 

 spire, and three, instead of four or five intervarical ribs. Butwe 

 have specimens of dominge?isis with the ribbing of yaquensis. 



M. domingensis is apparently the ancestor of the recent M. 

 antillarum Hinds {nodatus Reeve) which Tryon, I think erron- 

 eously, united with M. recurirostris Broderip. M. antillarum 

 Hinds is living on the beach at Monte Cristi. It has the form of 

 M. domingensis but the canal is longer and the spines much more 

 developed. 



M. doming ensishz.% been found at Bowden, Cumana, and the 

 Caroni Series of Trinidad (Guppy). 



Localities. — (Exp'd '16) Large, typical shells with three in- 

 tervarical ribs, on the Guayabin to Mao road, Rio Cana; the mu- 

 tation, with four or five intervarical ribs, approaching M. yaquen- 

 sis, Bluff' 1, Cercado de Mao, and Zone F, Rio Gurabo. An ex- 

 traordinarily large specimen (Fig. 6^74X42 mm, apparently 

 referable to M. domingenis, Bluff 1, Cercado de Mao. 

 Murex yaquensis, n. sp. 

 Plate 16, Figure 7 



M. antillarum Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 202, 1873. 



Not M. antillarum Hinds, Proc. Zool. Soc. p. 126, 1843. 



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

 521, 1873. 



As Gabb' s name is preoccupied by Hinds, the fossil requires 

 a new name and yaquensis seems appropriate. 



This species intergrades with M. domingensis. I have spec- 

 imens with the form of the latter and the ribbing of the former 

 species. Our typical shell is a metatype of Gabb's antillarum. 



