172 COCHLOSTYLA-PACHYSPH^RA. 



In Helicostyla, as in Calocochlea, there exist a number of minor 

 groups deserving individual discussion. They are as follows : 



Subsection 1. PACHYSPH^RA Pilsbry. 



Small, globular or globose'elevated, solid, brightly colored ; lacking 

 hydrophanous cuticle and spiral striae. Type, C. sphcerica. 



Subsection 2. ORUSTIA Morch, 1852. 



Turbinate-globose, thin, brightly colored ; partly covered with 

 hydrophanous cuticle ; no spiral striae. Lip narrowly reflexed, thin ; 

 coluinella vertical, not folded, deeply entering. Type, C. monticula. 



Subsection 3. COCHLODRYAS Martens, 1860. 



Globose-elevated ; colors brilliant green or brown ; no hydropha- 

 nous cuticle; suture white-margined ; surface shining, having faint 

 spiral striae above. Type, C. polychroa. 



Subsection 4. HELICOSTYLA s. str. 



Globose, globose-conic or oblong ; colors not vivid ; hydroph- 

 anous cuticle sometimes present. Type C. mirabilis. 



Subsection 1. PACHYSPH.ERA Pilsbry. 



Gruppe der Cochlostylce sphaericce MARTENS, Ostas. Landschn. 

 p. 97 : SEMPER, Keis. Landmoll. p. 1 97. 



A small group of compact, solid little shells, confined to north- 

 western Luzon. 



Key to 



a. Face of lip dark-edged ; shell globose 



b sutural baud white ; columellar band dark brown ; colu- 



mella white sphaerica. 



bb. sutural and columellar bands green ; columella reddish 



balteata. 

 aa. Face of lip not dark-edged; shell elevated 



b. Lip distinctly reflexed iloconensis. 



bb. Lip very bluntly reflexed annullata. 



C. SPHAERICA Sowerby. PI. 39, figs. 82, 83, 34 



Imperforate, very solid, globular ; ground-color straw-yellow 

 either uniform or with irregular oblique yellowish-chestnut streaks, 



