LITHIDION. 
179 
pansiusculo. — Operc. ? — Diam. maj. 11, min. 9, alt. 5 
mill. Ap. oblique 3'7 3 mill, longa. (Coll. Nr. 134.) 
Cyclostoma niveum Petit in Journ. Conch. 1850. I. p. 52. t. 3. f. 7.*) 
— — Chemn. ed. II. N. 248. t. 35. f. 20—22. 
Liihidion niveum Pfr. Consp. N. 259. 
Habitat Madagascar. (Mus. Cuming.) 
XX. Otopoma Gray. 
Operculum testaceum, solidum, anfractibus paucis, centro 
convexis, margine simplice. Testa conico-gubglobosa vel de- 
pressa; apertura subovalis; perist. rectum vel reflexiusculum, 
margine columeilari plerumque dilatato, umbilici partem majo- 
rem vel minorem obtegente. 
Otopoma Gray Catal. Cycloph. Brit. Mus. p. 35. 
— Pfr. in Zeitschr. f. Malak. 1851. p. 157. Consp. p. 29. 
Cyclostoma (spec.) Auclt, 
Conspectus specierum. 
A. Umbilico prorsus clauso §. 1. Nr. 1. 
B. Umbilico magis minusve aperto. 
1. Peristomatis margine dextro expanso §. 2. Nr. 2 — 6. 
2. Margine dextro recto §. 3. — 7 — 14. 
3. Margine dextro subexpanso, flexuoso §. 4. — 15. 
§. i. 
1. ©• clausum Sowerby. 
T. clause umbilicata, orbiculato-convexa, solidula, superne 
spiraliter et confertim sulculata, basi laevigata, carneo-albida ; 
spira brevis, obtusa; sutura plana, in vertice castanea; anfr. 
4 vix convexiusculi , ultimus antice descendens, basi subpla- 
nulatus; apertura obliqua, rotundato-ovalis , superne subangu- 
lata, intus flavida; perist. simplex, rectum, marginibus dis- 
*) T. suborbiculari-depressa, alba, late umbilicata, anfr. 4— 5, depresso- 
convexis, superne obsolete spiraliter striatis , ultimo medio subcarinato, sub- 
tus sublaevigato ; apertura suborbiculari, obliqua, intus sordide crocea, labro 
vix reflexo. — Diam. 11 mill., alt. 5 — 6 mill. — Yemen Arabiae? (Petit 1. c.) 
12 * 
