225 



one of these is immediately above the suture, while the upper one is at some little 

 distance below the periphery, which projects considerably beyond them. Base of 

 tlie last whorl rather short, marked by two strong spiral keels, which are rather 

 closely spaced and enclose a narrow Channel between them. The space between 

 the posterior keel and the periphery is quite strongly concave. The space between 

 the basal keel and the narrow, almost covered, umbilicus is well arched and mar- 

 ked by right slender lirations, which are less strongly developed and more closely 

 spaced about the umbilical area than at the keel. These lirations as well as the 

 two basal keels are rendered faintly crenulate by the incremental lines. The Spaces 

 between the spiral keels and the lirations are marked by many exceedingly fine in- 

 cised spiral striations, both on the spire and the base. Aperture slightly effuse ba- 

 sally, irregulär in outline ; the peripheral keel marking a deep acute angle and the 

 two basal ones slowly rounded Channels in the thin outer lip; columella slender, 

 concave and somewhat reflected over the umbilical opening; parietal wall covered 

 with a thin callus. 



Aufenthalt im See von Lanao auf Mindanao. Abbildung und Beschreibung 

 nach Bartsch. 



115. Vivipara gilliana Bartsch. 



Taf. 45. Fig. 6. 



Testa magna, umbilicata, late conica, rufo-fusca, lineis incrementi lirulisque microsco- 

 picis confertis undique sculpta, carinis distinctis tribus spiralibus in anfractu ultimo, infera 

 peripherica, duabus in spiram ascendeutibus cincta. Spira turrita, gracilis, apice eroso. An- 

 tractus persistentes öVj, rapide accrescentes, ultimus multo major, distincte angulatus, infra 

 convexus, laevior. Apertura magna, subcircularis, altior quam lata, intus rufo-fusca; peri- 

 stoma tenue, ad carinas subangulatum, raarginibus callo junctis, columellari concave, tenui, 

 leviter supra umbilicum concave. Operculum tenue, lutescens, nucleo excentrico depresso. 



Alt. 37,4, diam. max. 27,7, min. 23,5, diam. apert. 21,1 : 17,3 mm. 



Vivipara gilliana Bartsch, in: Proc. U. St. National Museum, 1907 vol. 32 

 p. 145 t. 10 fig. 12. 



.Shell large, broadly conic, reddish brown. (First one and onehalf whorls 

 worn). The second part of the second whorl shows the beginning of the sculpture 

 of the adult turns, which consists of three poorly developed keels, of which one 



I- 21. 22. I. 1908. 29 



