366 PROCEEDIXa^ OF THE yATlO^AL MUSEUM. vol.37. 



VIVIPARA CEBUENSIS, new species. 

 Plate 34, fig. 3. 



Shell broadly conic, exterior dark olive with a brownish tinge, inte- 

 rior purplish, lighter at the edge, peritreme with a black edge. Early 

 nuclear wdiorls small and smooth, forming a decided mucro; later 

 ones like the succeeding turns. Post-nuclear whorls inflated, round- 

 edly shouldered and appressed at the summit; marked by a slender 

 raised peripheral thread and numerous fine spiral lirations, of which 

 those on the well-rounded base are better developed than those occur- 

 ring between the sutures. Those of the base are also of more even 

 development and spacing than those of the spire. Base narrowly 

 umbilicated; edge of umbilicus scarcely angulated; aperture very 

 broadly oval, outer lip thin, showing the external sculpture within 

 by transmitted light; columella partly reflected over the umbilicus. 



The type (Cat. No. 207782, U.S.N.M.) and a lot of specimens were 

 found living by the writer in a boggy, brush-covered field, which 

 in the wet season must form a rather extensive lake, near Compostela, 

 Cebu. 



The type has six whorls and measures: Length, 31.8 mm.; diame- 

 ter, 24.6 mm. 



VIVIPARA MINDANENSIS MAMANUA, new subspecies. 

 Plate 34. fig. 4. 



Shell similar to I', ndndanensis in outline, but more openly umbili- 

 cated. In the present form the malleations are confined to the base, 

 while in minda7iensis proper they extend over the entire surface. 

 The coarse spiral threads of mindanensis are obsolete in mamanua, 

 which has the entire surface marked by very fine, closely spaced 

 spiral lirations. 



The type and another specimen of V. m. mamanua (Cat. No. 207779, 

 U.S.N.M.) were donated to the U. S. National Museum by the Museo 

 Ateneo of Manila, which contains additional material. They come 

 from Lake Mainit, MiiKhiiiao. 



The type has five whorls remaining, which measure: Length, 30.5 

 mm.; diameter, 29.5 mm. 



VIVIPARA PARTELLOI, new species. 

 Plate 34, figs. 5, H. 



Shell thin, l)roadly conic, with a strong perij)heral keel made up 

 of triangular segments which give it a stellate appearance; color 

 greenish yellow. Nuclear whorls eroded. Post-nuclear turns rather 

 inflated between the keel and the appressed summit and well rounded 

 on the base. Peripheral keel compressed and smooth on the early 

 whorls; on the last two it is composed of a series of hollow triangular 

 projections, arranged in a cone in cone manner, twelve of which occur 

 upon the last whorl and nine upon the preceding. Sutures well con- 



