PARTULINA, MOLOKAI. 25 



c . Narrower, pyramidal-conic, sinistral. 



d. Small, length 11 to 13 mm. helena, no.~h 



d l . Larger, length over 17 mm. 



e. Longitudinally boldly striped throughout; 



length 18 mm. theodorei, no. 12. 



e l . Suture bordered below by a dark band, 



others at periphery and columella; lip 



narrow, white; length 20 to 22 mm. 



mucida, no. 13. 



e*. Suture bordered by a white band or line; 

 lip and columella brown; length 21 to 25 

 mm. redfieldi, no. 15. 



e 8 . No conspicuous sutural border; variously 

 streaked, often with a subperipheral white 

 band, rarely others; lip wide, both lip 

 and columella white; length 22 to 26 mm. 



dwightii, no. 14. 



Series of P. virgulata. 



Embryonic whorls bicolored, having an upper white and 

 lower dark spiral zone; later whorls varying from many-banded 

 to plain. Shell either dextral or sinistral. 



While this group has the characteristic sculpture and form of 

 the other Partulina?, it is remarkably aberrant in the color- 

 pattern of the embryonic whorls. 



8. P. VIRGULATA (Mighels). PI. 6, figs. 1 to 6, 9, 10. 



' * Shell ovate-conic, light fawn color, beautifully adorned with 

 dark brown bands, more or less numerous; imperforate; whorls 

 5, convex; incremental striae delicate. Aperture oblong; lip 

 reflected, slightly inflected. Length 1 inch, diam. | inch" 

 {Mighels). 



Embryonic whorls nearly 3, the first purple-brown, the next 

 bicolored, having a wide snow-white band below the suture. 

 A narrow, more or less distinct cream-white subsutural band 

 continues to the end. Spiral bands appear about the middle of 

 the first neanic whorl, are often pale at first, becoming dark 

 chestnut on the last whorl, which is variously marked with 



