AM ASTRA/ OAHU. 215 



short green growth like the green coating of the roots. Those 

 on grass in a dry place were perfectly green. All the shells 

 we have studied have been -cleaned. 



47a. Var. aiea, n. var. PL 35, figs. 5, 9. The shell has 

 very convex whorls and concave lateral outlines, the last whorl 

 more inflated than in turritella. Yellow with a brown sum- 

 mit (fig. 5), or dark purple-brown with a light subsutural 

 band (fig. 9). 



Fig. 5. Length 16, diam. 8 mm. ; 6y 2 whorls. 



Fig. 9. Length 18.2, diam. 9.3 mm. ; 6% whorls. 



Aeia, a short valley dividing the ridge west of Halawa. 

 Co-types no. 1014 and 1045 Cooke coll. ; no. 104691 A. N. S. P. 



47&. Var. waiawa n. var., pi. 35, figs. 7, 8. Shell decidedly 

 wider, the outlines of the spire nearly straight. 



Length 16.3, diam. 9.5, aperture 7.2 mm. ; whorls 



Length 16, diam. 9, aperture 6.7 mm.; whorls 



Length 19, diam. 9.3, aperture 7.2 mm. ; whorls 7. 



The colors are : yellow or whitish above, chocolate below 

 the periphery, summit dark. Chocolate with a light sub- 

 sutural band. Yellow, shading towards chestnut behind the 

 lip, summit flesh-colored or light. These occur in the pro- 

 portions of 2, 3 and 10 specimens respectively. 



Waiawa. Gulick coll., no. 92231 A. N. S. P. 



It will be noted that these shells parallel in color-patterns 

 the forms spirizona, nigroldbris and chlorotica. The nigro- 

 labris pattern has not been seen in other lots of turritella, but 

 the dark and pale examples have the color of turritella forms 

 2 and 3. 



In shape, color and geographic position this race stands 

 between nigrolabris and turritella. It is probably a remnant 

 of the transitional forms which terminated in the evolution 

 of turritella. 



48. A. SPIRIZONA (Ferussac). PI. 35, figs. 16, 17, 18. 



The shell is ovate-pyramidal, rather solid, chestnut or dark 

 purplish-brown, with a sharply defined buff band below the 

 suture on the last three or four whorls, the summit dull purple 

 or purple-black. Spire straightly conic, rather acute. Em- 



