440 



BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



the dark zones the periostracum extends across the dark zones in 

 perfect specimens as slender light threads. Nuclear whorls almost 2, 

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

 whorls are moderately well rounded, appressed at the summit, and 

 marked by decidedly retractively slanting growth lines and closely 

 spaced microscopic spiral striations, which are present on both spire 

 and base. The periphery is almost rounded, the obsolete angle being 

 scarcely perceptible. Base moderately long, somewhat inflated and 

 strongly rounded. The aperture is subquadrate, oblique, and the 

 outer lip slightly expanded and reflected. The columella is very 

 narrow and bears a slight fold near its anterior limit. 



The type (U.S.N.M. no. 313578) was collected on the Menage 

 Expedition to Mindoro, and since this expedition worked only in 

 northeastern Mindoro and on the slopes of Mount Halcon, it is pre- 

 sumed that the specimens were obtained somewhere in that region. 

 The type has 5.5 whorls and measures: Length, 36.8 mm; greater 

 diameter, 26.3 mm; lesser diameter, 23 mm. 



A large series of additional specimens from the same source, most of 

 which unfortunately are young, are before me. The adult shells 

 yield the following data: 



This subspecies is easily distinguished from the others by its much 

 more vivid coloration, the light areas being much more intensely 

 white and the dark areas equally intensely dark, but the dark areas 

 are not so broad as in typical Cochlostyla (Hypselostyla) cincinniformis 

 cincinniformis, and consequently the shell as a whole appears paler 

 than in the typical race. 



COCHLOSTYLA (HYPSELOSTYLA) CINCINNIFORMIS CINCINNIFORMIS (Sowerby) 



Plate 101, Figure 12 



1841. Helix cincinniformis Sowerby, Proc. Zool. Soc. London, 1841, pp. 17-18. 



1842. Achatina cincinniformis Pfeiffer, Symbolae, vol. 2, p. 57. 



1848. Bulimus cincinniformis Pfeiffer, Monographia heliceorum viventium, 



vol. 2, p. 9. 

 1850. Amphidromus cincinniformis Albers, Die Heliceen, ed. 1, p. 139. 



