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Habitat in sylvis Palenqueanis, provinciœ Chiapas dictœ 

 (A. Morelet); Chiapas, Beipublicœ Mexicanœ (A. Boucard). 



Ohs. Species a cl, Pfeiffero et cœteris auctoribus cum 

 Cylindrella dccollnta Nysti errore commixta. Eucalodium 

 decollatum verum, provinciœ Tabasco, reipublicœ Mexicanœ 

 et provinciœ Vera Paz dictœ, Guatemalœ, incola, differt co- 

 lore pallide cinereo-fiisco et fere carneo, nec olivaceo-fusco, 

 anfractibus minoribus, planioribiis, costulis vix obliquis, 

 haud arcuatis, striis transversis nullis, anfractu ultimo vix 

 infra médium et magis valide carinato. Altéra species valde 

 vicina, E. Blandianum, testa, sub epidermide,violaceo-albida 

 nec albida, nitidiore, paulo latiore, anfractibus convexiori' 

 bus, costis majoribus, peculiariter rugato-malleatis, hUeolis 

 distinguenda. E. Ghiesbreghti et E. speciosum quoque vicina 

 videnlur, sed alterum nigro-fuscum, obsolète striato-ruga- 

 tum, nec arcuatim coslulalum, alterum multo minus et cos- 

 tis filaribus, subrectis munitum. 



Genus TOMOCYCLUS, Crosse et Fischer, 1872(1). 



Testa perforata, tiirrita, truncata; aperturasubcircularis, 

 parvula; peristoma duplex, internum breviter porreclum, 

 exlernum late expansum, foliaceum, margine supero inter- 

 rupto, peculiariter exciso et cavato. — Operculum circulare, 

 corneum sed crassiusculum, arctispirum, antice planiuscu- 

 lum, postice média processu obtuse rotundato munitum, mar- 

 gine anfractuum sublamelloso. 



Obs. Genus a G. Megalomastomate Guildingi separandum, 

 Cyclostoma simulacrum, Tomocyclum Gealei et verisimiliter 

 Cyclostoma Guatemalense complectens. 



(1) Elymologie : to/^o? frustam resectum , kvkkoç circulas. 



