Zoological Society. 131 



peritremate acuta ; umbilico mediocri ; operculo testaceo, tenuius- 

 culo, anfractibus septem, striatis. 



CyclostomaBrasiliense. Cycl. testa orbiculato-subdepressd, tenui, 

 albd, opacd ; an/ractibus 4-5 rotundatis, transvers^im striatis ; 

 suturd profundiusculd ; aperturd circulari ; peritremate tenvi, 

 acuta ; umbilico magna ; opercula testaceo, duplicato, extiis tenuis- 

 sime spirali. 



Hab. in urabrosis prope Rio Janeiro, Brasiliae. 



Cyclostoma GiGANTEUM. Cycl. tcstd orbiculato-suMepressd, cras- 

 siusculd, albicante ; ejndermide corned, fulvd, indutd, apice rufes- 

 cente ; anfractibus 5-6 rotundatis, transversim striatis, striis su- 

 perne validioribus ; suturd distinctd ; strid longitudinaliter im- 

 pressd prope suturam ; aperturd subeffusd, superne angulatd et in 

 canalem inconspicuam subdecurrente ; peritremate subincrassata ; 

 umbilico magna ; operculo lined elevatd spirali, interstitiis oblique 

 striatis. 



Hab. in sylvis prope Panamam. 



Cyclostoma corrugatum. Cycl. testa orbiculato-subdepressd, 

 crassiusculd, albidd, apice rufescente ; epidermide tenui, fused, in- 

 dutd ; spird subprominuld, acuminatiusculd ; anfractibus quinqiie 

 rotundatis, transversim striatis et corrugatis ; suturd distinctd ; 

 aperturd circulari, subeffusd, superne angulatd et in canalem in- 

 conspicuam desinente; peritremate tenuiusculo, margine acutiusculo, 

 latere umbilicali incrassato ; umbilico magna, margine crenulato, 

 intus transversim striata ; operculo testaceo, extus lamind elevatd, 

 convolutd, inths cameo, polito. 



Hab. Jamaica. 



Cyclostoma clathratulum. Cycl. testa subglobasd, crassiusculd, 

 obscurd ; spird subconoidali, apice obtusiusculo ; anfractibus qua- 

 tuor ad quinque rotundatis, superne longitudinaliter tenuiter stri- 

 atis, infra Icevibus ; aperturd subovali, superne angulatd ; peritre- 

 mate incrassato, supra umbilicum mediocre paululiim extenso. 



Hab. apud Yemen, Arabiae. 



Cyclostoma tigrinum. Cycl. testa suborbiculari, conicd, crassi- 

 usculd, IcBviusculd, pallescente, strigis ir regular ibus, transversis, 

 saturate brunneis pictd ; spird subacuminatd, submammillari ; an- 

 fractibus quinque, raptim crescentibus , rotundatis , plerumque carinis 

 tribus vel quatuor subobsoletis ; aperturd magnd, orbiculari, postice 

 subemarginatd; peritremate reflexo, alba, incrassato, prope ultimum 

 anfractum subinterrupto ; labia calumellari subextenso umbilicum 

 mediocre partim tegente ; suturd distinctd ; operculo tenui, cornea, 

 multispirali, anfractuum marginibus lamellasis. Long. 1"0; lat. 

 1-25 poll. 



Mr. Cuming has collected the following varieties, viz : — 



Var. a. Shell vfith. three rather indistinct spiral ridges ; peritreme 



nearly vi^hite. 



Var. b. Shell with three rather indistinct spiral ridges ; peritreme 



dull brown. Found under decayed leaves in the island of Guimaras. 



K2 



