LAND SHELLS OF GENUS OBBA FROM MINDORO 



367 



This species recalls Obba planulata bongabona as far as the general 

 sculptural pattern is concerned, but the whorls are more rounded, and 

 there is not the peripheral overhang that is present in 0. p. bonga- 

 bona, the last whorl being rounded rather than angulated. 



OBBA PLANULATA MANSALAYANA, new subspecies 



Plate 93, Figure 2 



The shell is moderately elevated with obsoletely angulated pe- 

 riphery. Nuclear whorls pale brown. The first postnuclear whorl is 

 almost brown marked by a few axial streaks of pale buff, which is 

 the ground color of the succeeding turns upon which also chestnut- 

 colored blotches occupy a larger area than the ground color. On all 

 the postnuclear whorls but the last one and a quarter an interrupted 

 median chestnut-colored band is present. The base is pale buff with 

 a broad interrupted spiral band of brown, which is about one-fourth 

 of the distance between the periphery and umbilicus anterior to the 

 periphery. The peristome is white, while the interior of the outer lip 

 is brown with a purplish flush. The early postnuclear whorls are 

 feebly malleated on their anterior half; these malleations disappear 



'Type. 



