HELIX-CHLOKITIS. 243 



1. Subsection Chloritis, restricted. 

 Group of H. ungulina. 



Spire decidedly sunken ; shell unicolored reddish or brown, the 

 epidermis generally deciduous. 



H. UNGULINA Linne. PL 51, figs. 54, 55, 56. 



Unicolored ; striatulate, not decussated ; spire deeply sunken, nar- 

 row; whorls 5J-6. Aperture a narrow crescent. 



Shell umbilicated, planorboid, obliquely striatulate, chestnut 

 colored (usually denuded of the thin pellucid epidermis), lighter be- 

 neath. Spire deeply sunken, composed of 5 J-6 slightly convex, nar- 

 row whorls, the last very large, descending in front, tumid above, 

 then sloping toward the periphery, bluntly subangular on the base, 

 broadly concave around the umbilicus, which is deep, and about one- 

 eighth the diameter of the shell. Aperture crescentic, embracing a 

 large segment of the whorl, little oblique, pale lilac-colored inside ; 

 peristome thin, expanded all around and subreflexed, fleshy-white 

 or pale lilac. Alt. 22, greater diam. 40, lesser 33 mill. 



Ceram, Moluccas. 



H. ungulina LINN., Syst. Nat. x, p. 772. PFR. Mon. i, p. 383 ; 

 Conchyl. Cab., t. 14, f. 7, 8. REEVE, Conch. Icon., f. 473. CHENU, 

 Illustr. Conchyl., t. 8, f. 1. MARTENS, Preuss. Exped. Ostas., Land- 

 schn., p. 279. TAPPARONE CANEFRI, Ann. Mus. Civ. Genov. xx, p. 

 149. Chloritis ungulina BECK, Index, p. 29. 



The largest species of the unicolored group of Chloritis. The 

 width of the concave spire, measured along the line of the lesser 

 diameter is less than one-third of that diameter, narrower than in 

 other species. The figures on my plate are not very good. The 

 suture along the latter fourth of the body-whorl should form a 

 tangent to the preceding whorls. 



The young are shortly, closely pilose. 



Var. MINOR Fer. PI. 51, figs. 57, 58, 59. 



More shining, brownish-orange, spire less immersed, peristome 

 proportionately wider, aperture larger, basal angle obsolete. Alt. 

 16, greater diam. 30, lesser 24 mill. ; aperture, length 18, width 16 

 mill. It is from Ceram. 



H. ungulma var. ft minor. Per. Hist. t. 77, f. 2. f Chloritis aur- 

 antium BECK, Index, p. 29. v. MARTENS, Preuss. Exped. Landschn., 

 p. 280. 



