230 LYROPUPA. 



c 2 . Larger, length over 2.2 mm. 



d 1 . Inner end of lower palatal fold straight. 



L. lyrata, no. 1. 



d 2 . Inner end of lower palatal fold hooked 

 downward. L. lyrata uncifera. no. la. 

 Ir. Specdes of Molokai, Lanai, Maui and Hawaii. 

 c 1 . Summit abruptly truncate ; Hawaii. 



L. truvcata, no. 7. 

 c 2 . Summit strongly convex, obtuse. 



<V . Ribs rather close, 18 to 19 on the last 

 whorl ; Maui. L. thaanuwvi, no. 4. 



d'-. Ribs rather distant, about 15 on the last 

 whorl ; Molokai. 



L. rhabdota pluris, 110. 3a. 

 c 3 . Summit conic with obtuse apex. 



d 1 . Spiral threads distant; about 12 ribs on 

 the last whorl. L. clathratula, no. 6. 



d-. Spiral threads close or obsolete. 

 e 1 . Molokai, Lanai and Maui. 



L. rhabdota, no. 3. 



e 2 . Hawaii. L. prisca, no. 5. 



or. Angular lamella short and low, scarcely penetrating be- 

 yond the outer end of the parietal lamella ; later whorls 

 with no spiral striation. 



& 1 . Lower palatal fold interrupted, a short outer and a 

 high, tubercular inner portion. Oahu. 



L. mirabilis, no. 9. 



&-. Lower palatal fold continuous, penetrating more 

 deeply than the upper, and usually stronger. 



c 1 . Back with 3 sulci ; shell pale, fusiform; Oahu. 



L. spaldingi, no. 8. 



C' 2 . Back with one broad sulcus; color brown (in 

 recent shells). 



d 1 . Basal fold strong; Hawaii. 



e 1 . Whorls very convex, the last with 

 12 to 14 ribs : length 2.25 ram. 



L. anccyaiw, no. 13. 



