290 ACHATINELLA VITTATA. 



In the typical form of vittata the bands are cinnamon with 

 darker cinnamon brown or Vandyke brown spots, or they may 

 be more rufous, of a hazel hue, shading into chestnut-brown 

 around the columella. The spots on the bands are clearly 

 vestiges of an original streaked pattern, which has been inter- 

 rupted by spiral white bands and lines. It is a further evolu- 

 tion of the cestus pattern. The suture is almost always bor- 

 dered with a rufous band. The lip has a fleshy tint, and the 

 tip of the apex is invariably dark. The shell may be either 

 dextral or sinistral. This form was collected in Nuuanu (pi. 

 57, figs. 2 to 2c.) by Gulick, exact location not recorded. 

 Reeve's type is a dextral shell. His figure is reproduced, 

 pi. 57, fig. 1. Gulick 's shells are both dextral and sinistral. 

 Similar shells, but all sinistral, were taken by Mr. Thwiug 

 on the eastern ridge of Nuuanu (pi. 57, figs. 3, 3a, 36). This 

 lot is all sinistral and rather small, length about 18 mm. 



A fine series was taken by Dr. C. M. Cooke on a spur of the 

 east ridge of Nuuanu opposite Luakaha (pi. 57, figs. 4, 4a, 

 5 to 56). All of the 33 specimens are sinistral. The bands 

 vary from chestnut to claret brown, and are very variable 

 in width, number and grouping, as the figures show. The size 

 and proportions vary widely, two shells measuring : 



Length 18.3, diam. 11.3, aperture 9.25 mm. 



Length 18.7, diam. 14, aperture 10.7 mm. 



The typical form of vittata is probably almost extinct at 

 the present time. PL 57, figs. 4, 4a are globosa patterns. 



A. vittata differs from cinerea and simulans by the lighter 

 color of the bands, which are spotted or streaked, the dark 

 sutural border, and the shape, which is less robust than simu- 

 lans. So far as I know it is not found on the western ridge 

 of Nuuanu. If this is the case the herds of vittata and simu- 

 lans are separated. The exact location of the colony or colo- 

 nies of vittata where Newcomb and Gulick collected is not 

 known to me, but from Newcomb 's statement that it ' is met 

 with in Nuuanu valley some three miles from Honolulu" and 

 "the inflated variety designated as A. globosa by Dr. Pfeiffer 

 is not uncommon,' ' we may gather that both came from lower 

 Nuuanu, doubtless on the Pauoa side or ridge. The shells 



