94 COCHLOSTYLA-CHLOR^EA. 



Heliciform shells, distinguished at once from the closely allied 

 section Corasia by the excessively close, fine spiral striation covering 

 the whole surface both above and below, except the smooth apical 

 embryonic whorl. These snails live on trees, like Corasia and most 

 other Cochlostylas. 



The present group is equivalent to Semper's " Gruppe der bunt- 

 schaligen Chlorceen" His " Gruppe der einfarbigen Chlorceen" con- 

 sists of species of Dorcasia. They differ from the true Chlorcea 

 species in having a compound mucus gland (" multifid gland "), com- 

 posed of several acinose caeca, whilst that gland in Chlorcea, as in 

 all Cochlostyla, is simple ; the shells also are notably different. 



The species of Chlorcea fall into four groups, as follows : 



A. Latter half of the body-whorl in no part narrower than the 

 adjacent part of the preceding whorl, viewed from above. 



1. Solid, keeled or rounded, usually banded. Group of C. fibula. 



2. Thin, acutely keeled; greenish, often banded. 



Group of C. dry ope. 



B. Latter half of the body-whorl narrower in some part than the 

 preceding whorl, viewed from above. 



3. Last ivhorl not acutely keeled, descending in front. 



Group of C. paradoxa. 

 2. Last whorl acutely keeled, not descending in front. 



Group of C. thersites. 



(1) GROUP OF C. FIBULA. 



Solid, varying from depressed-globose to lens-shaped, carinated 

 or rounded at the periphery, the last whorl circular in circumfer- 

 ence, not laterally flattened on its latter half; descending in front; 

 lip thickened and reflexed ; usually banded. 



These shells are more solid than in the closely allied group of C. 

 dryope ; they do not have the last whorl compressed at the periphery 

 as in the group of C. paradoxa. 



C. FIBULA Broderip. PI. 22, figs. 21, 22, 23; pi. 21, figs. 31, 32, 



Oo. 



Imperforate, depressed, solid, the entire circumference acutely 

 carinated ; white or pale yellowish, generally three-banded ; a broad 

 purplish-brown band below and another above the periphery, the 

 latter ascending the spire in company with a narrow dark line border- 

 ing the lower edge of the suture. 



