238 
by exceedingly fine spiral striations. The periphery of the last whorl of the nepionic 
shell is strongly angulated, while the basis is rounded like the spaces between the 
sutures and narrowly umbilicated. The adult whorls are inflated, evenly rounded at 
the side, but abruptly so near the summit, which renders this roundly tabulated. 
The periphery of the last whorl is marked by a moderately strong keel, while the 
space between it and the summit is crossed by six slender threads, which are not 
regularly spaced. In addition to these threads there are many exceedingly fine inter- 
rupted wavy spiral lirations between them. The summit of the whorls falls con- 
siderably below the peripheral keels and exposes this above the suture in all the 
whorls. The summits of the whorls and the rounded shoulders are marked in ad- 
dition to the above mentioned sculpture with oblique wrinkles, which give this part, 
of the whorl a quite strongly malleated appearance. Periphery of the last whorl 
angulated. Base short, somewhat inflated, well arched, excavated about the narrow 
open umbilicus, and marked by ten subequal and irregularly spaced slender spiral 
lirations, between which there are many exceedingly fine interrupted papillose spiral 
lines. Aperture oval, bluish white within, bordered by a very narrow black edge 
on the outside; outer lipthin; columella concave, slender, somewhat expanded at the 
base, and slightly reflected over the umbilicus; parietal wall covered with a thin 
callus. Operculum orange, with depressed eccentric nucleus, marked by many lines 
of growth. 
Aufenthalt im See von Lanao auf Mindanao. Abbildung und Beschreibung 
nach Bartsch. 
125. Vivipara mindanensis bagangensis Bartsch. 
Tat. 49. Fig. 9. 
Differt a typo testa magis globosa, saturate olivaceo-fusca, faucibus rufo fuscis , liris 
spiralibus subtilibus, superficie rugis obliquis obsolete nialleata. 
Diani. maj. 19,3, min. 17. alt. 22,8 mm. 
Vivipara mindanensis bagangensis n. subsp., Bartsch, in: Pr. U. St. 
National Museum, 1907 vol. 32 p. 140 t. 11 fig. 12. 
„Shell much more globose, than, V. mindanensis, dark olive green, with a red- 
dish tinge. Interior of aperture reddish brown. Spire and base marked by more 
or less equally spaced fine spiral lirations and weakly developed obliquely forward 
slanting folds, which lend the last two turns a malleated appearance. In addition. 
