250 HELIX-CHLORITIS. 



H. unguicula FER. Hist., t. 76, f. 3, 4. PFR. Mon. i, p. 384. 

 REEVE, Conch Icon. f. 468. MARTENS, Preuss. Exped., Landschn. 

 p. 283. H. yoldii MORCH, ms. 



Varies much in size. The whitish band above and white um- 

 bilical patch will distinguish it from other forms. 



H. GRUNERI Pfeiffer. PI. 68, figs. 86, 87, 88. 



Shell umbilicated, depressed, nearly plane above, very minutely 

 punctate-striate, rufous ; whorls 5J, perceptibly increasing, nearly 

 plane, the last one rounded, a trifle deflexed in front ; umbilicus 

 narrow ; aperture sub vertical, depressed, broadly lunar ; peristome 

 thickened, reflexed, margins joined by a thin callus which bears 

 above a strong arcuate tooth. Alt. 18, greater diam. 38, lesser 32 

 mill. (P/r.) 



Island of Burn, Moluccas. 



H. gruneri PFR. P. Z. S. 1845, p. 63 ; Monogr. i, p. 384 ; Conchyl. 

 Cab. p. 473, t. 157, f. 9-11. MARTENS, Ostas. Landschn. p. 284. 

 Semicornu gruneri Pfr., WALLACE, P. Z. S. 1865, p. 410. 



Spire not sunken ; shell finely punctate, unicolored ; umbilicus 

 narrow. 



H. EXACTA Pfeiffer. PI. 50, figs. 35, 36. 



Shell umbilicate, depressed, solid, somewhat roughly striate, 

 tawny; spire plane, subimmersed in the middle. Whorls 5i a tri- 

 fle convex, slowly increasing, the last not descending, rounded on 

 the periphery, the base subinflated around the narrow umbilicus ; 

 aperture little oblique, narrowly lunar ; peristome narrowly ex- 

 panded and thickened, margins remote, the right margin ascending 

 a little from the insertion, columellar margin a little dilated. Alt. 

 14, greater diam. 30, lesser 26? mill. (Pfr.) 



Northern New Guinea. 



H. exacta PFR., P. Z. S. 1862, p. 271 ; Novit. Conch, p. 212, t. 

 56, f. 5, 6 ; Monogr. v. p. 386. 



Group of H. eustoma. 



Shell thin, the spire nearly plane ; epfdermis thin usually per- 

 sistant, hairy. Species inhabiting the islands lying eastward from 

 New Guinea, from the Louisiade and Solomon groups north to New 

 Ireland and the Admiralty Is. 



