24 HELIX-PAPUINA. 



slowly increasing, the last slightly descending in front, subangulate, 

 the base flat, radiately striated. Aperture very oblique, subtrigonal- 

 oval, concolored within ; peristome thin, broadly expanded and a 

 little reflexed, violet-blackish ; right margin lightly arched, basal 

 straightened, the columellar vaultingly reflexed. 



Alt. 29, greater diam. 29, lesser 24 mill. (Pfr.) 



Moluccas f 



H. lenta PFR., Malak. Bl. 1854, p. 57 ; Monogr. iv, p. 257. H. 

 pileus var. PFR., MOD. Hel. Viv. i, p. 324 ; Kusters Conch. Cab., p. 

 157, t. 40, f. 5. 



H. PILEUS Miiller. PI. 8, figs. 42, 43, 44, 45. 



Xarrowly, obliquely perforated, turrited trochiform, thin but 

 strong. Periphery obtusely subcarinated. Base rather flat, deep 

 brown ; suture margined with a dark line ; upper surface of whorls 

 light, with or without dark bands or lines, lip broadly expanded, 

 white. 



The spire is high-conical, base rather flat ; surface smooth, lightly 

 striatulate ; apex obtuse, the earlier two whorls dark purple or red- 

 dish ; suture shallow ; whorls 6, the last obtusely angled at the 

 periphery, not descending in front. Aperture very oblique, sub- 

 triangular, browD or banded within. The entire lip is broadly 

 expanded, white. A circular tract of dark brown almost covers the 

 base, extending nearly to the periphery ; above this the surface is 

 cream colored, pinkish or yellowish, with or without brown spiral 

 bands and lines. 



Alt. 30, diam. 22 mill. 



Alt, 32, diam. 26 mill. 



Aru Islands. 



H. pileus MULL., Hist. Verm. p. 80. BORN, Test. Mus. Cses. t. 

 16, f. 11, 12. CHEMNITZ, Conch. Cab. ix, f. 1046-1048=edit. nov. 

 t. 21, f. 1-3. FEB., Hist. t. 63A, f. 3-8. LAM., edit. Dh., viii, p. 

 64. PFR., Monogr. i, p. 324. CHENU, Illust. Conch, t. 6, f. 4-6.- 

 REEVE, Conch. Icon. f. 493. v. MARTENS, Ostas. Landschn. p. 

 323. Helix pileata, bifasciata and Bulla ambigua of GMEL., Syst. 

 xiii, pp. 3431, 3609. Geotrochm pileus BECK, Ind., p. 47. WAL- 

 LACE, P. Z. S., 1865, p. 411. H. (Geotrochus) pileus TAP. CAN., 

 Ann. Mus. Civ. Genov. xix, p. 137, 1883. 



Distinguished by its high, turrited form. The pattern of band- 

 ing is very variable. Tapparone describes a form with light colored 

 apex. 



