237 
and the summit of tlie succeeding wliorl there are two additional keels wliich are a 
little less strongly developed. The basal one of these (the suprasutural keel) is im- 
mediately above the suture, while the other (the median keel) lies halfway between 
it and the peripheral keel. A fourth keel, which is considerably less developed than 
any of tlie three others, is situated on the shoulder, about as far posterior to the 
peripherial keel as the first one below the peripheral keel is anterior to it. Base 
of the last whorl rather short, well arched, marked by about eight subequal spiral 
lirations, which are a little more closely spaced and less strongly developed near the 
umbilical chink than away from it. Aperture irregulär, bluish white within, with 
dark border ; outer lip thin, rendered sinuous by the keels ; columella slender, con- 
cavely curved; parietal wall covered with a moderately tliick, bluish white callus, 
which is dark edged and gives the peritreme a complete aspect. — Operculum thin, 
orange colored, with depressed eccentric nucleus and many lines of grooth.“ 
Aufenthalt im See von Lanao auf Mindanao, als ächte Seeform ungemein ver- 
änderlich. Bartsch unterscheidet neun Varietäten, die er mit a—X bezeichnet. Ich 
kopire seine Figuren. 
124. Vivipara mindanensis Bartsch. 
Taf. 49. Fig. 10. 
Testa umbilicata, ovata vel globoso-turrita , pallide olivaceo-viridis, subtiliter striata, 
iineolis spiralibus et in anfractibus ultimis lirulis majoribus sculpta. Spira detrita, in speci- 
minibus embryonalibus, anfr. 3*/ 2 exhibentibus, spiraliter striata. Anfractus 7, superi angu- 
lati, infei i inflati, supra tabulato-humerosi, infra peripheriam descendentes , ultimus magnus, 
inflatus, lira peripherica majore et 6 superis distinctis insignis, angulatus, circa umbilicum 
angustum sed apertum excavatus, basi lirulis circiter 10 munitus. Apertura ovata, faucibus 
coeruleo-albis, anguste nigro limbatis; marginibus callo tenui junctis, externo tenui, columel- 
lari concavo, gracili, infra leviter expanso et reflexo. 
Alt. 31, diam. 24, dim. apert. 15,3 : 12,5 mm. 
Vivipara mindanensis Bartsch, in: Pr. U. S. Nat. Museum 1907 vol. 32 
no. 1518 p. 139 t. 11 fig. 11. — 
„Shell subturreted, light olive green. The early whorls of the type are eroded, 
but it contained 9 nepionic Shells, one of which will serve for the description of the 
early turns; the largest nepionic shell has o 1 ^ volutions, the first two of which are 
more loosely coiled and more rounded than those that follow. They are all marked 
