HELIX-PLANISPIRA. 285 



H. ATROFUSCA Pfeiffer. PI. 54, figs. 28, 29, 30. 



Shell umbilicated, depressed, rather thin, closely striated, blackish- 

 brown, with a buff sutural band. Spire conoid-convex, apex cor- 

 neous. Whorls 4*, convex, rapidly increasing, the last depressed- 

 rotund, a little descending in front, moderately excavated around 

 the umbilicus. Aperture ample, diagonal, lunate-oval, very light 

 and pearl-like inside ; peristome white, broadly expanded and a 

 little reflexed, margins converging, the columellar dilated above, 

 having a rounded tubercle within. Alt. 15, greater diam. 32, lesser 

 25 mill. (P/r.) 



Island of Halmaheira. 



H. atrofusca PFR. P. Z. S. 1861, p. 22, t. 3, f. 3 ; Novit. Conch, 

 p. 164, t. 45, f. 1-3 ; Monogr. v, p. 382. MARTENS, Ostas. Zool., 

 Landschn. p. 299. Planispira atro-fusca WALLACE, P. Z. S. 1865, 

 p. 409. 



Whorls more rapidly increasing than in the allied H. zonalis, 

 aperture less oblique, larger, the columella with a rounded tuber- 

 cle. The color is also different. 



H. LATIZONA Pfeiffer. Unfigured. 



Shell moderately umbilicated, depressed, rather thin, striatulate, 

 scarcely shining, brown, ornamented with a rather broad white zone 

 at the suture ; spire sub-plane. Whorls 4J, the upper somewhat 

 convex, the last rotund. Above subsulcate in front and deflexed ; 

 constricted beneath. Aperture very oblique, rotund-oval ; peristome 

 all around rather broadly expanded, margins converging ; the col- 

 umella having an oblong noduliform tubercle within. 



Alt. 11, greater diam. 26*, lesser 21 mill. (Pfr.) 



Island of Ceram. 



H. latizona PFR. P. Z. S. 1863, p. 524; Monogr. v, p. 394. 

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



Similar to H. atrofusca but the spire is plane. 



H. LOXOTROPIS Pfeiffer. PL 46, figs. 60-64, 68. 



Shell narrowly or nearly-covered perforate, depressed conoidal, 

 subangulate, arcuately striatulate, opaque, greenish-olive with brown 

 bands, more distinct and wider beneath ; sutural region pale ; spire 

 rather elevated, obtuse ; whorls 4J, a little convex, the last one 

 plane beneath, subangulated at the periphery, distinctly descending 

 in front, obliquely swollen, then constricted ; aperture subhorizon- 



