LAND SHELLS OF GENUS OBBA FROM MINDORO 



347 



OBBA LISTERI CAMPOENSIS, new subspecies 



Plate 88, Figube 4 



Shell helicoid, broadly conic with an acute peripheral keel. The 

 two nuclear whorls are uniform pale brown and marked by fine incre- 

 mental lines. The remaining whorls are of brown ground color, which 

 becomes intensified on the succeeding whorls. This ground color is 

 broken up by areas of soiled flesh color, pale yellow, or buff, and in 

 spots almost pale orange, which blotch, streak, and fulgurate the upper 

 surface. In addition to this, the postnuclear whorls are marked by 

 a rather broad spiral brown band, the basal portion of which marks the 

 median portion of the turns between the summit and the periphery. 

 The base is of yellowish buff ground color. There is a broad, more or 

 less interrupted and irregular band of bright brown about one-third of 

 the distance between the periphery and the umbilicus. The mallea- 

 tions between this and the periphery and also those between the 

 periphery and the umbilicus are of a paler shade of brown. Peristome 

 flesh-colored, tinged with brown. Interior of outer lip brown with a 

 purplish tinge, darker at the bands described for the outside. The 

 postnuclear whorls are very strongly malleated; the malleations 

 extend over the entire upper surface, while on the base they become 

 weaker toward the umbilicus. In addition to the strong malleations, 

 the whorls are marked by irregular incremental lines and very strong 

 incised spiral lines, which are best shown on the next to the last turn. 

 On the base they are best expressed in the umbilicus and adjacent 

 area, being decidedly obscured toward the periphery by the mallea- 

 tions. The aperture is ovate; the peristome is rather strongly thick- 

 ened and reflected, covering about one-third of the umbilicus at the 

 parietal wall. The inner lip bears a slender tooth on its middle. 



Type— The type, U.S.N.M. No. 382926, was collected by C. 

 Canonizado, of the Philippine Bureau of Science, at Maestre de Campo 

 Island off east-central Mindoro. It has 4.5 whorls, and measures: 

 Height, 14.7 mm; greater diameter, 31.3 mm.; lesser diameter, 25.8 

 mm. 



Remarks. — Four additional specimens from the same island yield the 

 following measurements: 



