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GEN. CYCLOSTOMA. Lamk. 
54. C. SIMULACRHUM. 
T. pyramidalis, umbilicata , fulvo-virescens vel saturate castanea ; 
spira turrita, apice pallidiore, acuminato, plerumque decollato ; 
anfr. 10-12 planulati, obsolete striati, ultimo ad aream umbilica- 
lem excavato, filocarinato; apertura circularis; peristoma intus niti- 
dum, pallide cinerascens, duplex; internum lineare, integrum, 
emergens; externum late expansum, concavum; margines acuti, 
versus umbilicum soluti, limbo sinistro libero ; columellari appresso, 
utroque reflexiusculo. 
Longit. 38-45. — Diam. 11-12. 
Vivit in profundis sylvarum prov. Vera-Paz. 
55. C. IR ADIOSUM. 
T. ventriculoso-pyramidalis, perforata, creberrime decussata, 
translucida, pallide fulva, lineolis interruptis rubiginosis in ultimo 
anfractu saturatioribus, ad basim radiatim divergentibus ornata; 
spira turrito-acummnata , sdepius truncata ; anfr. 8 convexiusculi, ul- 
limo ventricosulo; apertura rotundo -ovalis, callo nitido cingulata ; 
peristoma expansum, concavum, lamelloso-crispatum, superne dimi- 
diatum , appressum ; marginibus tenuibus, acutis, versus umbilicum 
plerumque fimbriatis. 
Longit. testee integrde 20. — Diam. 8 1/2. 
H. petrosa provincie Petenensis. 
56. C. RUSBICUNDUNM. 
T. ovato-pyramidalis, umbilicata, translucida, coccineo- rubens, 
apicem versus violaceo saturatiore; anfr. 6 convexi, priores plicato- 
costulati, ultimo tenuiter striato, strigis ad basim prominentioribus, 
ad aream umbilicalem írisuleato; apertura rotundo-ovalis; peri- 
stoma duplex, interno lineari, emergente; externo angusto , latere 
anfractus penultimi emarginato. 
Longit. 15. — Diam. 7. 
H. prov. Peten et Vera-Paz, arborum super foliis. 
