176 ADAMSIELLA $. 4 
293 12. A, ehlorostoma Sowerby. 
T. perforata, cylindraceo- -turrita, truncata, solida, longitu- 
dinaliter. confertissime plicata, lineis impressis spiralibus deeus- 
sata, violaceo- nigricans; anfr. superst. 5 convexi, regulariter 
eU ju accrescentes ; apertura verticalis , subcircularis, intus 
saturate livida; perist. luteum, subduplicatum : internum. vix 
prominulum vel obsoletum, externum undique horizontaliter 
expansum, margine supero et basali subangulatim dilatatis. — 
Operc. normale. Long. 12, diam. 5 mill Ap. intus 3'/, 
roill. longa. (Coll. Nr. 132.) 
Cyclostoma chlorostoma Som. 'Thes. N. 156. p. 146. t. 28. f. 168. *) 
— — Chemn. ed. IL. N. 117. p. 115. t. 14. f. 1—3 
— sericeum Fer. Mus, teste Cuming. 
Choanopoma chlorostoma Gray Catal. Cycloph. p. 53. N. 24. 
"4 damsiella chlorostoma Pfr. Consp. N. 954. 
Habitat in Demerara. (Sowerby). 
C. Opereulum ovale, anfracübus paucis, magis minusve 
celeriter accrescentibus, nucleo excentrico. 
XIX. Lithidion Gray. 
Operculum subcirculare, testaceum, anfractibus subrapide 
accrescentibus, carina valida, convexa, subcentrali munitis, 
marginibus simplicibus. —lesta depressa, late et aperte umbi- 
licata ; apertura subcircularis; peristoma simplex, tenue vel in- 
crassatum. 
Lithidion Gray in Catal. Cycloph. Brit. Mus. p. 35. 
um Pfr. im Zeitschr, f. Malak. 1851. p. 156. Consp. p. 98. 
Cyclostoma (spec.) Somerby, Petit, Pfr. 
294 1. E. suleatum Gray. 
T. umbilicata, depresso-fornicata, solida, liris elevatis, 
acutiusculis cincta, nitidula, coerulescenti-albida; spira parum 
*) T. cylindraceo-pyramidali, nigricante, apice decollato; anfr. 5 ven- 
tricosis, decussatis; sutura distincta; apertura circulari; peritremate con- 
tinuo, reflexo-patente, flavo; umbilico minori, (Sow. l. c.) 
