— 103 — 



nem columellarem superante et angulum efformante. — 

 Operculum typicum, teîiue, membratiaceum, actispirum, 

 luteo-fusculum. — Diam. maj. 26, min. 22, ait. 13 mill. 

 Aperlura 13 mill. longa, vix 12 lata (Coll. Crosse). 



Habitat in provincia Tabasco dicta, reipublicx Mexi- 

 ca7ix [Maler). 



Obs. Species Amphicycloto ( Cyclophoro ) ponderoso 

 Pfeifferi sat vicina, sed minor, haud crassa, parum pon- 

 derosa, subtranslucida et perislomate vix incrassato dis- 

 tinguenda. 



2. CiSTCLA Sargi. 



T. distincte [perforata, oblongo-turrita, truncata, liris 

 transversis et lineis longitudinalibus elevatis^ confertissi- 

 mis déganter echinato-decussata, haud nitens, aspera, te- 

 nnis, diaphana, pallide fulvida, lineis interruptis, rufis 

 cingulata; spira sat elevata, apice déficiente ; sutnra sim- 

 plex, impressa; anfr. superst. 4 cotivexiiisculi, ullimus 

 penultimum vix superans; aperlura verticalis^ fere circu- 

 laris, subovalis, intus pallide fulvida; peristoma duplex, 

 internum continuiim, vix incrassatum, tenue, pallide ful- 

 vido-albidum, externum late et rectangule expansum, re- 

 flexum, ad anfr actum penultimum excisum; limbus peri- 

 stomatis exlerni concentrice subimbricatim striatus et 

 pulcherrime rnfo radiatus. — Operculum nucleo vix ex- 

 centrico, concaviusculo , margine externo anfractuum 

 libero et anfractu ultimo extus striis obliquis, validis 

 peculiariter impresso. — Diam. maj. 10, ait. 14 1/2 mill. 

 Aperlura [cum perislomate externo) 7 mill. longa, 7 lata 

 [Coll. Crosse). 



Habitat in regione Coban dicta, Guatemalœ {F. Sarg). 



Obs. Species, primo aspeclu, Cistulse radiasse Moreleti, 

 regionis ejusdem incolx, simillima, vix inter varietates 



