ACHATINELLA CONCAVOSPIRA. 353 



first one slightly, the last two very convex. All are deeply 

 margined below the suture, the margin at first brown or tinted, 

 often becoming white later. The last whorl is marked with 

 bands of carob-brown or tawny, and sometimes tawny streaks, 

 on a white or warm buff ground, the markings mainly on the 

 base, and deepening as they approach the lip. The aperture 

 is white within, lip deep brown, slightly expanded and thick- 

 ened within. All seen are perforate and dextral. 



Length 19*4, diam. ll^/s mm. ; aperture 9 mm. 



Length 19, diam. 10% mm. ; aperture 8.9 mm. 



In a lot from Palihua (pi. 61, figs. 12 to 12d, coll. by C. 

 Montague Cooke) this typical form passes into almost the 

 mustelina shape, with varied coloring. The dimensions are 

 remarkably diverse, from length 20, diam. 11.3, aperture 9 

 mm., to length 20.2, diam. 12.5, aperture 10.8 mm. This lot 

 connects typical concavospira with the following. 



A local form or subspecies of concavospira, which may be 

 called griseizona P. & C., was found by Dr. Cooke in Palihua 

 iki. The colony, which is very uniform, extends over ten or 

 fifteen acres of lantana, at the head of a small valley running 

 north. The shells, pi. 61, figs. 10, 10a, 10&, are rather stout in 

 figure, the outlines of the spire decidedly to very slightly con- 

 cave. The marginal furrow below the suture is less emphatic 

 than in typical concavospira, and appears on 2% whorls, in- 

 stead of over 3 as in concavospira. The apex and embryonic 

 whorls are white ; there is no sutural color-band on the early 

 neanic whorls ; the later whorls have fawn bands, more or 

 less streaked and overlaid with white, producing various 

 shades or tints of brownish drab, pale Quaker drab or pale 

 violet gray. The lip is white or dull brownish. There are 

 6*4 to 6!/2 whorls, the penultimate whorl much less convex 

 than in concavospira. This form has the coloration of napus. 



41a. A. CONCAVOSPIRA TURBiNiFORMis Gulick. PL 62, figs. 22, 

 23. 



"Shell dextral, subperforate, subglobose-conic, a little shin- 

 ing, striated with growth lines but hardly spirals, white, en- 

 circled around the base with a few brown transverse lines; 



