50 Bulletin 29 214 



canal somewhat reflexed; posterior sinus very shallow, lying 

 close to the suture. Length 13, width 4 mm. 



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



Genus Turris Bolten 



Turris albida Perry 

 Plate 8, Figures 4-8 



Pleurotoma albida Perry, Conch. Expl., pi. 32, fig. 4, 181 1. 

 Pleurotoma virgo Lamarck, An. s. Vert., vol. 7, p. 94, 1822. 

 Pleurotoma c ochlearis Conrad, Jour. Acad. Nat. Sci. Phila., 2d ser., 



vol. 1, p. 115, pi. 11, fig. 23, 184S. 

 Pleurotoma haitensis Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, 



p. 50, 1849. 

 Pleurotoma virgo Moore, Quart. Jour., vol. 9, p. 130, 1853. 

 Pleurotoma barretti Guppy, Quart. Jour. Geol. Soc. London, vol. 22, 



p. 290, pi. 17, fig. 6, 1866. 

 Pleurotoma antillarum Crosse, Journ. de Conchyliologie, vol. 13, p. 34, 



pi. 1, fig. 8, 1865. (Not of d'Orbigny). 

 Turris (Surcula) virgo Gabb, Trans. Amer. Phil. Soc, vol. 15, pp. 



206, 207, 1873. 

 Pleurotoma albida Dall, Bull. Mus. Comp. Zoology Harvard Coll., vol, 



18, pp. 72, 73, 1889; Trans. Wagner Inst., vol. 3. pt. 1, p. 28, pi. 4, 



fig. 8a, 1890. 

 Pleurotoma albida var. tellea Dall, Bull. Mus. Comp. Zoology Harvard 



Coll., vol. 18, p. 73, 1889. 

 Pleurotoma albida Brown and Pilsbry, Proc. Acad. Nat. Sci. Phila., 



p. 343, 1911. 

 Pleurotoma haitensis Cossmann, Journ. de Conchyliologie, vol. 61, pp. 



16-18, pi. 2, figs. 1-4, 1913. 

 Pleurotoma cf. antillarum Cossmann, Journ. de Conchyliologie, vol. 



61, p. 18, pi. 2, figs. 5, 6, 1913. 

 Tun-is albida Dall, Bull 90 U. S. Nat. Museum, p. 38, pi. 5, fig. 13, pi. 



14, fig. 7, 1915. 



Our Santo Domingo specimens represent five mutations : — 

 (1) Turris albida haitensis (fig. 4), which corresponds with Sow- 

 erby's type and with Chipolan shells from Florida; (2) T. albida 

 Barretti (fig. 5), a handsome variety described by Guppy from 



