LAND SHELLS OF GENUS OBBA FROM MINDORO 



Remarks. — Twenty-five specimens yield the following data: 



369 



1 Type. 



The present subspecies resembles most nearly Obba planulata man- 

 salayana, but can at once be distinguished from it by the practical 

 absence of the basal spiral zone. 



OBBA PLANULATA MANGARINA, new subspecies 



Plate 93, Figure 4 



The shell is broadly conic and its last whorl obtusely angulated. 

 The first nuclear whorl is flesh-colored, the next straw-colored; the 

 first postnuclear whorl is bright chestnut-brown, the rest are of 

 flesh-colored ground color, spotted and vermiculated with brown. In 

 fact the chestnut-browm coloration is so strong that it overshadows 

 the lighter flesh-colored elements and might well be considered the 

 major color scheme. A narrow median brown band, a little deeper 

 than the rest of the brown coloration of the upper surface, marks the 

 middle of the postnuclear whorl, except the last fourth of the last turn. 

 The base is flesh-colored, spotted and mottled with brown; the peri- 

 stome is white, while the interior of the outer lip is purplish brown. 

 The anterior two-thirds of the postnuclear turns are strongly malle- 

 ated. These malleations evanesce at about the termination of the next 



