AMASTRA, OAHU. 163 



part of the Main Range of Oahu, where there are many species 

 and races, some of them very local, others more widely rang- 

 ing. Two species, albolabris and reticulata have migrated to 

 the Waianae Range also. 



Key to Species of the Variegata Series. 



1. Shell sinistral, oblong, chestnut with darker spire. 



A. thaanumi, no. 22. 

 Shell dextral, 2. 



2. Outlines of the spire concave ; chestnut-brown ; 11x7 mm. 



A. irwiniana, no. 17. 

 Outlines of spire straight or convex, 3. 



3. Shell and parietal callus very thick ; oblong-conic ; length 



14 to 15, diam. 8 mm. 



A. solida, no. 23; A. venusta, no. 24. 

 Parietal callus thin or moderate, 4. 



4. A thread and groove above suture on 3d and 4th whorls; 

 cylindric-oblong. A. spaldingi, no. 15. 

 Smooth above suture, 5. 



5. Shell distinctly or strongly striate, and usually decus- 



sated with spirals, 6. 

 Shell weakly striate or smoothish, 8. 



6. Reddish-brown and whitish, sometimes banded, under a 



yellow cuticle; 16x9 to 14x8 1 / 4 mm. 



A. albolabris, no. 18 ; A. subrostrata, no. 19. 

 Deep brown, rather rudely striate and minutely decus- 

 sate ; 17x9iX{ mm. A. sericea, no. 20. 

 Dark brown, oblong-conic, widest near the base; finely, 

 rather weakly striate; 16.5x9.2 mm. 



A. davisiana, no. 21. 

 Fossil, Diamond Head ; cylindric-comc ; 14x7.1 mm. 



A. caputadamantis, no. 28. 



Maculate, banded, or with ragged streaks of whitish on 

 a dark brown ground ; striation and incised spirals gen- 

 erally strong, 7. 



7. Small, 12 to 13 mm. long. A. transversalis, no. 27. 

 Larger, 19x12 mm. ; globose-ovate ; embryonic whorls 



striate. A. undata, no. 29. 



