ACHATINELLA APEXFULVA. 329 



colonies in which the mutation arose. They may conveniently 

 be referred to as the ll cervixnivea pattern." This pattern is 

 characteristic of the Poamoho-Helemano ridge and its spurs. 

 I suppose that the hybrid apicata X cervixnivea colonies are 

 chiefly lower than the pure cervixnivea. According to a note 

 made from Mr. Spalding's collection his no. 3712, from the 

 central ridge of Kalaikoa is an apicata X cervixnivea mix- 

 ture ; 3 dextral, 12 sinistral shells. 



37 d. A. APEXFULVA BEATA P. & C., ii. subsp. PL 60, figs. 17- 

 17c;pl.55,fig. 5. 



The shell is dextral, solid, with the embryonic whorls ochra- 

 ceous-buff (or in white shells, light buff). Subsequent whorls 

 are never streaked, but vary in color as follows : 



Fig. 5. Pure white, peristome white, embryonic whorls 

 faintly cartridge buff. 



Figs. 17a, 176. White with several deep chestnut or black- 

 ish bands, of which one ascends the spire ; last whorl with the 

 band-intervals somewhat violaceous, or the bands confluent; 

 a wide sutural border snow-white ; embryonic whorls buff. 



Fig. 17c. Light buff with chestnut bands, lip pale lilac. 



Fig. 17. Last 2y 2 whorls black with a white sutural line. 

 This is the typical apexfulva pattern. 



Length 19.6, diam. 12.5 mm. ; 6^2 whorls. 



Crest of the Poamoho-Helemano division ridge, types no. 

 108809 A. N. S. P., from no. 3430-31 of Mr. Spalding's col- 

 lection. 



This splendid polychromatic race inhabits a limited area on 

 the ridge, at higher elevations than the cervixnivea pattern, 

 of which beat a is merely a specialized, banded form. In fact, 

 the main feature distinguishing it from the cervixnivea pat- 

 tern of apicata is that there are no streaks, but the color when 

 present is in bands, which are a little diffuse at their edges 

 when not lost in a general melanism. I imagine that while 

 the beata has been evolved parallel to A. a. aloha, the two are 

 not directly connected. Mr. Spalding's no. 3883, from "Hele- 

 mano, the second ravine above the intersection with Poa- 

 moho," is probably part of or near the typical colony of 



