472 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



no. 104355) have 7.1 and 6.9 whorls and measure: Length, 71.6 and 

 60 mm; greater diameter, 31.5 and 39.2 mm, respectively. Two 

 (U.S.N.M. no. 104050) collected by Rich (who was on the U. S. Ex- 

 ploring Expedition, but the expedition touched only at the southern 

 end of the island) have 7.5 and 7.2 whorls and measure: Length, 66.1 

 and 63.3 mm; greater diameter, 29.7 and 27.2 mm, respectively. 

 Two and a young specimen (U.S.N.M. no. 20348) collected by the 

 Exploring Expedition, probably also were purchased in Manila. One 

 of these has 7.5 whorls and measures: Length, 74.8 mm; greater 

 diameter, 33 mm. The other adult specimen has an injured tip and 

 so was not measured. U.S.N.M. no. 109467, from the Redfield col- 

 lection, has 7.1 whorls and measures: Length, 66 mm ; greater diameter, 

 31.7 mm. 



Sowerby, in describing this species, stated that it came from Central 

 America. The Cuming specimens probably all came from north- 

 eastern Mindoro. 



COCHLOSTYLA (CHRYSALLIS) CHRYSALIDIFORMIS MACRA Bartsch 



Plate 108, Figure 6 



1932. Cochlostyla (Chrysallis) chrysalidifor?nis macra Bartsch, Journ. Washington 

 Acad. Sci., vol. 22, p. 339. 



Shell very slender, pupiform, covered with a pale straw-colored 

 periostracum, which is crossed by axial, somewhat zigzag, retractively 

 curved, hydrophanous zones that extend upon the dark band at the 

 summit as false teeth. The early whorls are darker in color than the 

 last two-thirds of the shell. When the periostracum is removed a 

 brown zone is apparent immediately below the summit on all the turns. 

 The outer edge of the reflected peristome is of a bright reddish-brown 

 tone, and so is the outer edge of the columella and parietal callus. The 

 interior of the aperture is white. Nuclear whorls about 2.5, smooth. 

 The postnuclear whorls are moderately rounded, marked by strong, 

 somewhat rough, retractively slanting lines of growth, which almost 

 attain the strength of riblets and which extend over the base to the 

 umbilical area. The sculpture is a little weaker than in the typical 

 race. The summit of the whorls is appressed, and the suture is but 

 slightly constricted. The periphery is well rounded. The aperture is 

 irregularly auriculate. The peristome is expanded and reflected, that 

 of the inner lip being broadly expanded at the insertion of the inner 

 lip and reflected over the umbilicus, leaving only a narrow chink. It 

 extends over the parietal wall as a thin callus. 



The type (U.S.N.M. no. 382969) is without specific locality. It 

 has 8 whorls and measures: Length, 74 mm; greater diameter, 24.7 

 mm. 



The extreme slenderness of this race distinguishes it from the other 

 forms. 



