132 
MEGALOMASTOMA §. 3. 
Cyclostoma simulacrum Chemn. ed. II. N. 256. t. 36. f. ll. 12. 
Megalomastoma simulacrum Pfr. Consp. N. 192. 
Testa minore, anfractibus convexioribus ; long. 28, diam. 10 mill. 
Cyclostoma Copanense Sow. Thes. Suppl. N. 194. p. 165*. t. 31 B. 
f. 310. 311.*) 
Habitat in profundis syl varum provinciae Yera Paz Guatemalae. 
13. M. duatemalen^e Pfp. 
> 
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. liberum, album, duplex : 
internum continuum, vix porrectum, externum dilatatum, hori- 
zontaliter expansum, supra perforationem excisum. — Operc. ? 
— Long. 24, diam. 8 mill. Ap. 57 2 mill, longa. (Mus. Cuming.) 
Cyclostoma Gualcmalense Pfr. in Proc. Zool. Soc. 1851. Jul. 
— — Chemn . ed. II. N. 257. t. 36. f. 13. 14. 
Megalomastoma Guatcmalense Pfr. Consp. N. 193. p. 58. 
Habitat in provincia Yera Paz Guatemalae. 
14. M. a If uni §owerby. 
i 
T. 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 subcanaliculato-impresso , ex- 
ternum breviter expansum, superne et ad sinistram dilatatum. — 
Operc. membranaceum , planum, arctispirum, corneo-lutes- 
cens. — Long. 26, diam. 9 mill. Ap. intus 6 mill. diam. 
(Coll. Nr. 93.) 
Cyclostoma altum Sow. in Proc. Zool. Soc. 1842. p. 84. **) 
*) T. acuminato-turrita (plerumque decollata), laevi, tennissime striata, 
nitida, olivaceo - fulva ; spira elongata ; anfr. 6 rotundatis ; sutura distincta; 
apertura circulari; peritremate duplici , interno tenui, angusto, porrecto, ad 
ultimum anfractum interrupto , extern© lato , lamellari , extenso , subinflexo, 
ad ultimum anfractum porrecto , emarginato , flexuoso ; umbilico mediocri, 
extus carinato ; operculo corneo , multispirali , lamelloso , intus stylo brevi, 
centrali, margine incrassato. (Sow. 1. c. ) 
**) T. acuminato-turrita, crassiuscula, fusca, laevi, tenuissime striata, 
