106 OXYSTYLA, ANTILLES. 



Typical UNDATA. PI. 27, figs. 16, 17, 18. 



The terms of Bruguiere's description agree best with specimens 

 before me from Trinidad, collected by Mr. Guppy, from the Bahamas, 

 Bendall and White, and from St. Thomas, StrebeL The ground-color 

 is pale brownish-yellow or white ; the stripes are purplish-brown, 

 rather wide in the median region of the last whorl, and mostly forked 

 above, and on the penultimate whorl often spread into blotches, as in 

 0. princeps ; they do not continue to the base, there being a lighter 

 basal area; blackish-brown varices narrow, two or three on the last 

 whorl ; the three bands may be seen on some part of the last whorl, 

 though often not distinct ; but on the spire the band above the mid- 

 dle is usually conspicuous, though narrow, and the edge of another 

 may often be seen in the suture. The summit of the first whorl is 

 dark or blackish-brown. Columella subvertical, the white part nearly 

 straight. Parietal wall rich chestnut-brown. Surface often rather 

 coarsely and shallowly plicatulate. 



Alt. 51, diam. 31, longest axis of aperture 30 mill. 



Alt. 49, diam. 26J, longest axis of aperture 27 mill. 



Trinidad (R. L. Guppy); Union Island, Grenadines (C. D. Stew- 

 art); Cariacou, Grenadines (Sir R. Rawson); St. Thomas (Strebel); 

 Andros (White) and New Providence (Bendall), Bahamas. 



Balimus undatus BRUG., Encycl. Meth. i, p. 320 (1792) Ortha- 



licus undatus BLAND, Amer. Journ. of Conch, iy, 1868, p. 185. 

 GUPFY, Journ. of Conchology vii, 1893, p. 217 0. ferussaci- 

 undatus STREBEL, Beitr. Mex. Land- und Siisswasser-Conchylien v, 

 p. 24, pi. 2, fig. 10. Bulimus zebra GUPPY, Ann. Mag. Nat. Hist. 

 (3), xvii, 1866, p. 48 ; Proc. Scient. Asso., Trinidad, 1866, p. 16. 

 Orthalicus zebra CROSSE, Journ. de Conchy]., 1890, p. 41 (peculiar 

 synonymy). E. A. SMITH, Journ. of Conchology viii, 1896, p. 240. 

 Achatina undulata GUILDING, Zoological Journal iii, p. 531 

 (1828?). 



One specimen from Union Island, Grenadines, is before me, agree- 

 ing in all respects with the Trinidad form. Mr. Smith also reports 

 it from the adjacent Cariacou Island, though exactly what form 

 occurred there I do not know (0. zebra, Proc. Malac. Soc. Lond. i, 

 p. 321). As Union Island was the locality of Guilding's Ach. undu- 

 lata, and the description tallies well with the present form, that name 

 is in all probability a synonym. 



Mr. E. A. Smith also reports this species from St. Vincent, on the 



