237 



and the summit of the succeeding whorl tliere are two additional keels which are a 

 little less strongly developed. The basal one of these (the suprasutural keel) is iin- 

 mediately above the suture, while tlie other (the median keel) lies halfway between 

 it and the peripheral keel. A fourth keel, which is considerably less developed than 

 any of the 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 thick, 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, 

 lineolis spiralibus et in anfractibus ultimis iirulis raajoribus sculpta. Spira detrlta, in speci- 

 minibus embryonalibus, anfr. S'/j exhibentibus, spiraliter striata. Anfractus 7, superi angu- 

 lati, infeii inflati, supra tabulato-humerosi, infra peripheiiam descendentes, ultimus magQus, 

 inflatus, lira peripherica majore et 6 superis distinctis insignis, angulatus, circa umbilicum 

 angustum sed apertum excavatus, basi hrulis 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 S^/g volutions, the first two of which are 

 more loosely coiled and more rounded than those that foUow. They are all marked 



