HELIX-CHLORITIS. 241 



Unfigured and doubtful species of Obba. 

 H. CHEIRI Lesson. Unfigured. 



Shell depressed, umbilicate, rather solid, obliquely sub-rugose, buff, 

 striate with rufous ; last whorl broad, carinated ; suture profound ; 

 umbilicus large, funnel-shaped ; aperture obovate, white within ; 

 peristome thick, reflexed, margin glabrous. Alt. 8, diam. 16 lines. 

 (Lesson, Voy. de la Coquille, p. 308.) 



Port Dorey, New Guinea. 



An unrecognized species, probably belonging either to Obbina or 

 more likely, Geotrochus. 



H. RECLUZIANA Le Guillou. Unfigured. 



Shell orbicular, convex-depressed above, reddish-brown, whitish 

 below. Whorls 5, lightly and closely striated, convex-depressed, the 

 last rotund, encircled by a white band margined above with a rufous 

 line. Aperture subrotund, reflexed, tinted with brown ; columella 

 dilated, truncated and obtusely one-toothed within. Umbilicus con- 

 solidated, rufescent. Alt. 17-20, diam. 26-27 mill. (Quill, in 

 Rev. Zool. 1842, p. 137.) 



Habitat unknown. 



Evidently not a member of this group. It is impossible to 

 identify this species except by an examination of the original type. 



Subgenus CHLORITIS Beck, 1837. 



Shell depressed-globose, discoidal or planorboid, the apical whorl 

 (and usually the whole spire) flattened or sunken ; nucleus small, 

 not differently sculptured from the succeeding whorls. Lip re- 

 flexed. Southern China to northern Australia, East Indies. 



Shells of the great group Chloritis are distinguished from Obba 

 and its subdivisions and from Camcena and Acavus by the smaller 

 nucleus, not marked off in any way from the following whorls ; from 

 Hadra by the flattened or concave nucleus, etc. 



The subgenus comprises a great variety of forms, but the extremes 

 are connected by so many intervening species that subdivisions are 

 only vaguely bounded and correspondingly difficult to define. 



Section I. CHLORITIS Beck. 



The apical whorl (and often the whole shell) having granules or 

 hair-scars arranged in oblique rows. Shell generally reddish or 

 brown, unicolored, or more rarely banded. 

 16 



