438 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Suture moderately constricted. Periphery of the last whorl obsoletely 

 angulated. Base moderately long, inflated, well rounded. Aperture 

 almost subquadrate, slightly oblique. Outer lip narrowly expanded 

 and reflected. Columella only moderately broad with a twist on its 

 anterior third. 



The specimen described and figured (U.S.N.M. no. 104378) is one 

 of a series of specimens presented to the United States National 

 Museum by Pedro de Mesa, who collected them on Golo Island. 

 It has 5.5 whorls and measures: Length, 37.9 mm; greater diameter, 

 27.2 mm; lesser diameter, 24.4 mm. 



The rest of the collection furnishes the data given in the foregoing 

 table. 



This race is easily distinguished from the other members by its 

 peculiar reddish-brown banding. 



COCHLOSTYLA (HYPSELOSTYLA) CINCINNIFORMIS DEMESANA (Clench and Archer) 



Plate 101, Figure 11 



1931. Helicostyla cincinniformis demesana Clench and Archer, Occ. Papers 



Boston Soc. Nat. Hist., vol. 5, p. 336, pi. 17, fig. 5. 



1932. Cochlostyla (Hypselostylus) cincinniformis demesana Bartsch, Journ. 



Washington Acad. Sci., vol. 22, p. 337. 



Shell elongate-ovate. Nuclear whorls dark; the postnuclear turns 

 are marked by a broad band of brown at the summit and another at 

 the periphery, and a dark area about the umbilical region. These 

 bands are beautifully marked by axial hydrophanous lines of a pale 

 buff color, which give to the sutures a distinctly vertebrated aspect. 

 On the last whorl an orange-brown suffusion extends posteriorly from 

 the peripheral blackish-brown band and also anteriorly, almost cover- 

 ing, in fact completely so at the lip, the light zone between the dark 

 umbilical area and the peripheral band where the periostracum is 

 present; this also seems to be tinged with the basal color although it 

 likewise has a golden-buff sheen. The interior of the aperture is 

 pearly gray, and the outer lip and the base of the columella are pale 

 brown. The spiral dark bands show inconspicuously within the 

 aperture, though they are readily perceived. Nuclear whorls almost 

 2, well rounded, marked only by lines of growth. The postnuclear 

 whorls are well rounded, appressed at the summit, and marked by 

 retractively slanting lines of growth, which are crossed by numerous, 

 closely spaced, microscopic spiral striations on both spire and base. 

 The suture is moderately constricted and the periphery obsoletely 

 angulated. The aperture is subquadrate; outer lip slightly expanded 

 and reflected. 



The specimen described and figured (U.S.N.M. no. 313582) is one of 

 a series collected by Pedro de Mesa at Aparico, Golo Island. It has 



