450 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



1855. Bulimus simplex Pfeiffer, Martini-Chemnitz Conchy lien Cabinet, ed. 2, 



vol. 1, Abt. 13, Theil 1, pp. 181-182, pi. 53, figs. 8, 9. 



1856. Bulimus simplex Pfeiffer, Malakozool. Blatter, vol. 2, p. 147. 



1859. Bulimus simplex Pfeiffer, Monographia heliceorum viventium, vol. 4, 



p. 362. 



1860. Phengus simplex Martens, Albers, Die Heliceen, ed. 2, p. 180. 



1868. Cochlostyla simplex Pfeiffer, Monographia heliceorum viventium, vol. 6, 



p. 8. 

 1874. Cochlostyla simplex Semper, Reisen im Archipel der Philippinen, pt. 2, 



vol. 3, p. 218. 

 1877. Bulimus simplex Pfeiffer, Monographia heliceorum viventium, vol. 8, 



p. 10. 

 1887. Cochlostyla simplex Hidalgo, Journ. Conchyl., vol. 35, p. 177; in part. 

 1892. Cochlostyla simplex Pilsbry, Man. Conch., ser. 2, vol. 8, pp. 33-34, pi. 8, 



figs. 48, 49, 52. 

 1895. Helicostyla simplex Pilsbry, Man. Conch., ser. 2, vol. 9, p. 229. 



1897. Cochlostyla simplex Hidalgo, Journ. Conchyl., vol. 44, pp. 315, 331, 332, 



341, 347, 348, 350, 352. 



1898. Cochlostyla simplex^ Mollendorff, Abh. Naturf. Ges. Gorlitz, vol. 22, 



p. 131; in part. 

 1901. Cochlostyla simplex Hidalgo, Obras malacologicas, p. 523 (in part), 



pi. 73, fig. 2. 

 1911. Cochlostyla simplex Mollendorff, Kobelt, and Winter, Semper's 



Reisen im Archipel der Philippinen, vol. 10, pp. 252-254 (in part), 



pi. 51, figs. 1, la. 

 1932. Cochlostyla (Eudoxus) simplex Bartsch, Journ. Washington Acad. Sci., 



vol. 22, p. 338. 



Shell small, ovate, the early whorls white, the last one with a 

 grayish-olive tinge, more intense on the base. Interior of the aper- 

 ture, peristome, and columella white. The periostracum is exceed- 

 ingly thin. Nuclear whorls 1.6, strongly rounded, smooth, forming 

 an almost pointed apex, marked by lines of growth only. The post- 

 nuclear whorls are strongly rounded, the last one decidedly inflated, 

 appressed at the summit, and marked by rather rough threadlike lines 

 of growth and numerous microscopic, closely spaced, spiral striations, 

 which are present on both spire and base. Suture moderately con- 

 stricted; periphery obsoletely angulated, at least the more intense 

 coloration of the base and the sharp termination thereof at the 

 periphery give one the impression of an obsolete angle. Aperture 

 broadly ovate, slightly oblique; outer lip thin, expanded, and reflected. 

 The columella is narrow, with a faint thread a little posterior at the 

 junction of the columella with the outer lip. 



There are three specimens from the Redfield collection (U.S.N.M. 

 no. 309465) collected on Mindoro, one of which I have described and 

 figured; one specimen (U.S.N.M. no. 313602) collected by Quadras; 

 four specimens (U.S.N.M. no. 20389) collected by the Exploring 

 Expedition, probably at the southern tip of Mindoro. These yield 

 the following data: 



