246 HELIX-CHLORITIS. 



H. bifoveata BENS., Ann. Mag. N. H. 2nd ser. xviii, p. 251. PFR., 

 Mon. iv, p. 296. HANLEY & THEOB., Conch. Indica, t. 14, f. 8. 



A very peculiar species, having the spire deeply sunken. The 

 sculpture consists of lines of granules crossing each other obliquely. 

 I have not seen the species, but place it here on account of the con- 

 cave spire. It might be considered as a tangent from the circle of 

 Helix breviseta. The very poor figure is larger than the natural 

 size. 



Group of H. circumdata. 



Spire sunken ; last whorl encircled by numerous dark and light 

 bands and lines. Distribution, New Guinea. 



H. CIRCUMDATA Ferussac. PI. 52, figs. 74, 75, 76. 



Shell umbilicated, discoidal-inflated ; surface delicately but closely 

 and regularly striatulate, and showing under a lens minute points 

 (hair-scars) regularly arranged. Very numerous light yellowish 

 and chestnut bands and lines encircle the body-whorl ; Spire con- 

 cave, shallow. Whorls 5, the last descending to the middle of the 

 preceding whorl in front, broadly concave around the umbilicus. 

 Aperture slightly oblique, whitish inside ; peristome white, ex- 

 panded all around, baso-columellar margin narrowly reflexed. Alt. 

 13, greater diam. 27, lesser 22 mill. ; alt. of apert. 12, width 15 mill. 



Aru Is. ; My sol; Waigiou ; Mac Cluer Gulf, western New Guinea. 



H. circumdata FER. Hist,, t. 77, f. 1. PHILIPPI, Abbild. i, p. 152, 

 Helix t. 5, f. 9. QUOY &GAIMARD, Voy. de 1'Uranie, Zool. p. 470, 

 t. 67, f. 12, 13. PFR., Mon. i, p. 387 ; Conchyl. Cab. p. 335. 

 KEEVE, Conch. Icon. f. 470. MARTENS, Monatsber. K. P. Acad. 

 Wissensch. Berl. p. 274, 1887. TAPPARONE CANEFRI, Ann. Mus. 

 Civ. Genov. xxiv, 1887, p. 142. H. molliseta PFR. P. Z. S. 1862, 

 p. 271 ; Novit. Conch, p. 205, t. 54, f. 4-6. TAPPARONE CANEFRI, 

 Ann. Mus. Civ. Genov. 1887, p. 142. Semicor?iu circumdatum and 

 S. mollisetum WALLACE, P. Z. S. 1865, p. 410. 



A smaller species than H. lansbergiana, with less expanded per- 

 istome. It differs from H. maforensis in having short hairs or hair- 

 scars all over. 



H. molliseta is doubtless a synonym. The original figures are 

 given on pi. 51, figs. 63, 64, 65. 



