128 HELIX-HADRA. 



A species allied to H. semicastanea, but thinner, lighter, with a 

 different color-pattern and denser, more obvious and regular granu- 

 lation. There is a great variation in size, as in Hadra bipartite and 

 the other species. The type form measures, alt. 10J, diam. 19 mill. 

 The measurements following the description are those of a " var. 

 major" of Dohrn. 



H. DARWINI Brazier. TJnfigured. 



Shell umbilicated, depressedly globose, very thin, finely granu- 

 lated and radiately striated ; spire moderately elevated, obtuse ; 

 whorls 5, slowly increasing, convex, last roundly convex, slightly 

 descending in front, dirty yellow ; base convex, sculptured the same 

 as the upper surface ; umbilicus rather small, deep ; aperture diag- 

 onal, ovately lunate ; peristome very little reflexed, white ; margins 

 approximating and joined by a thin callus, columellar margin re- 

 flected and half covering the umbilicus. (Brazier.} 



Alt. 8, greater diam. ] 4, lesser 11 mill. 



North coast of Australia. 



Helix (Hadra) darwini BRAZIER, Proc. Zool. Soc. Lond. 1871, p. 

 639. 



Allied to H. forsteriana Pfr. 



Group of H. bougainvillei Pfr. 

 H. BOUGAINVILLEI Pfeiffer. PI. 22, figs. 55, 56. 



Shell narrowly rimate, globose-depressed, solid, opaque, uniform 

 dark chestnut-colored all over. Surface rather smooth, but mal- 

 leated obliquely coarsely but superficially above and below the pe- 

 riphery, and having shallow concentric sulci on the base. The spire 

 is low, obtuse ; sutures impressed ; whorls 5, the inner ones reddish, 

 nearly flat, the outer ones convex, the last one descending in front, 

 having a cord-like keel at the periphery, much swollen behind the 

 columellar lip and around the umbilicus. Aperture very oblique, 

 rounded lunate, flesh-colored inside ; peristome expanded, white, 

 columellar margin dilated over and covering or nearly covering the 

 umbilicus. Alt. 36, diam. 57 mill. Alt. 39, diam. 62* mill. 



Bougainville Island, Salomon Group. 



H. Bougainvillei PFR. P. Z. S. 1860, p. 133, t. 50, f. 7 ; Mai. Bl. 

 1860, p. 235 ; Monog. Hel. Viv. v, p. 275 ; Conchylien Cabinet, p. 

 557, t. 167, f. 1, 2. H. Angasiana NEWCOMB, Ann. Lye. New 

 York vii, p. 283, May, 1860. 



