HELIX-PLANISPIRA. 287 



H. ATACTA Pfeiffer. PL 44, figs. 18, 19, 20. 



Shell narrowly umbilicatecl, depressed, subangulate, lightly stri- 

 atulate, whitish, with 5 narrow rufous bands, the lowest remote from 

 the umbilicus ; spire little projecting ; whorls 4J, scarcely convex, 

 the last but a little (and equally) convex above and below, suban- 

 gulated, the suture descending in front into the interval between the 

 lowest and next band. Whorl not swollen above, a little so beneath, 

 and slightly constricted ; aperture subhorizontal, sub-ax-shaped ; 

 peristome reflexed, of the color of the shell, thin, margins moder- 

 ately approaching, the upper nearly straight, basal arcuate. Alt. 

 11-12, diarn. 24-25 J mill. (Mart.) 



Halmaheira, Ternate, Kajoa, Moluccas. 



H. atacta PFR., P. Z. S. 1861, p. 386, t. 37, f. 5 ; MOD. v, p. 376. 

 MARTENS Preuss. Exped. n. Ostas., Landschn. p. 306, t. 16, f. 1. 

 Planispira atacta WALLACE, P. Z. S. 1865, p. 409. 



Differs from H. loxotropis in being much more depressed, the 

 swelling and constriction behind the peristome far less developed, 

 the lower band remote from the umbilicus. 



Group of H. kurri. 



More or less hirsute, or having hair-scars. Spire plane, not con- 

 cave ; suture white-bordered ; band or bands when present continued 

 on the lip. Umbilicus open ; suture more or less distinctly white- 

 bordered. 



These species are allied to H. zonalis and H. exceptiuncula. 



H. KURRI Pfeiffer. PL 45, figs. 21, 22, 23. 



Shell umbilicated, discoidal, the spire flat or a mere trifle raised, 

 not sunken at the apex ; typically corneous-white with a supra- 

 peripheral brown band and a fainter peripheral band, both extend- 

 ing to the edge of the expanded lip; base somewhat swollen, gently 

 constricted behind the peristome. 



The shell is thin, nearly lusterless, showing under a lens sparse, 

 short, delicate hairs, or if rubbed, their scars ; delicately striatulate. 

 Coloration as described above, or as follows : Base corneous-white, 

 becoming brownish toward the periphery, where there is a brown 

 band (often indistinct, and sometimes having several very faint nar- 

 row bands below it) ; above this peripheral girdle there is a pure 

 white zone, and then a dark brown supra-peripheral band, bordered 

 on its upper as well as lower edge with white ; the suture has an in- 



