72 
profundae, infera callosa, subcolumellaris inconspicua; peristoma continuum, solutum, al- 
bum, expansiusculum. 
Long. 11, diam. 3 millim., apert. 2 millim. lata, 1^ longa. 
Clausilia Lowei ^Ibers in Zeitschr. f. Malak. 1852. p. 31. 
— — Pfeiffer Monogr. III. p. 592. n. 46. 
— — de Charpentier in Petit Journ. d. Conch. 1852. p. 370. n. 59. 
Habitat in Portosanclo. Haud rara. 
CYCLOSTOMACEAE. 
Testacea operculata, pulmonata, sexu distincto; tentacula 2, oculi ad basin exter- 
nam tentaculorum. 
Gen us. 
Cyclostoina. 
Testa heliciformis, apertura circularis, operculo .spirato testaceo, cartilagineo vel 
corneo clausa. 
Sectio Craspedoporaa *) 
Operculum corneum, solidum, arctissime spiratum, nucleo centrali; pagina externa 
plana, interna prominentia circulari in anfractu penultimo munita, medio profunde con- 
cava. Testa subturbinata, rimata, anfractu ultimo antice subcoarcfato; peristoma conti- 
nuum, prominentiam internam operculi excipiens. (Pfr.) 
1. Cyclostoma lucidum Lowe. 
Tab. 16. Fig. 29 — 31. 
Testa rimata, globoso -conica, solidula, striata, lucida, olivaceo- cornea; spira co- 
nica, acutiuscula; anfractus 3 convexi, ultimus obsolete angulatus, antice subsolutus, basi 
inflatus, rimam subarcuatam formans; apertura parum obliqua, circularis; peristoma obtusum. 
Diam. maj. 5^, min. 3, ait. 5^- millim. 
*) Pfeiffer Monogr. Pneumonoporaorum p. 57. Genus Craspedopoma, 
