132 MEGALOMASTOMA $. 3 
Cyclostoma simulacrum Chemn. ed. YI. N. 256. t. 36, f. 11. 12. 
Megalomastoma simulacrum Pfr. Consp. N. 192. 
8. Testa minore, anfraetibus convexioribus; long. 28, diàm. 10 mill. 
Cyclostoma Copanense Som. 'Thes. Suppl. N. 194. p. 165*. t. 31 B. 
£..810..311. 5) 
Habitat in profundis sylvarum provinciae Vera Paz Guatemalae. 
296 13. WE. Guatemnalemse E*fr. 
T. perforata, oblonga, solidula, subtruncata, striatula, 
olivaceo -fusca; spira convexiusculo-turrita; anfr. 6 parum 
convexi, ultimus angustior, antice descendens, breviter solutus, 
basi circa perforationem apertam compressus, nec carinatus; 
apertura verticalis, subcircularis ; perist. hberum, album, duplex : 
internum continuum, vix porrectum, externum dilatatum, hori- 
zontaliter expansum, supra perforationem excisum. — Operc.? 
— Long. 24, diam. 8 mill. Ap. 5!/, mill. longa. (Mus. Cüisirig.) 
Cyclostoma Guatemalense. Pfr. in Proc. Zool. Soc. 1851. Jul. 
— — Chemn. ed, 1l. N. 257. t. 36. f. 13. 14. 
Megalomastoma Gwuatemalense Pfr. Consp. N. 193. p. 58. 
Habitat in provincia Vera Paz Guatemalae. 
14. WE. nltum Sowerby. 
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[os] 
-11 
Ts subperforata, oblongo- turrita, solidula, subtiliter striata, 
sublaevigata, sericea, castanea spira convexo -turrita , apice 
lutescente acutiuscula; anfr. 7.—8, supremi vix convexiusculi, 
penultimus convexior, ultimus angustior, basi rotundatus, obtuse 
filocarinatus; apertura subobliqua, basi producta, circularis, 
intus brunnea; perist. duplex:internum continuum, expansum, 
latere sinistro juxta columellam subcanalieulato-impresso, ex- 
ternum breviter expansum, superne et ad sinistram dilatatum. — 
Opere. membranaceum, planum, aretispirum, corneo -lutes- 
cens. — Long. 26, diam. 9 mill Ap. intus 6 mill. diam. 
(Coll. Nr. 93.) 
Cyclostoma allum Som. in Proc. Zool. Soc. 1842. p. 84, **) 
*) T. acuminato-turrita (plerumque decollata), laevi, tenuissime striata, 
nitida, olivaceo-fulva; spira elongata; anfr. 6 rotundatis; sutura distincta; 
apertura circulari; peritremate duplici, interno tenui, angusto, porrecto, ad 
ultimum anfractum interrupto, externo lato, lamellari, extenso, subinflexo, 
* ad ultimum anfractum porrecto, emarginato, flexuoso; umbilico medioeri, 
extus carinato; operculo corneo, multispirali, lamelloso, intus stylo brevi, 
centrali, margine incrassato. (Sow. l. c.) 
**) T. acuminato-turrita, crassimuscula, fusca, laevi, tenuissime striata, 
