176 
ADAMSIELLA §. 4. 
293 12. A. elilorogtomu Sowerliy. 
T. perforata, cylindraceo-turrita, truncata, solicla, longitu- 
dinaliter confertissime plicata, lineis impressis spiralibus decus- 
sata, violaceo - nigricans ; anfr. superst. 5 convexi, regulariter 
et lente accrescentes ; apertura yerticalis, subcircularis , intus 
saturate livida; perist. luteum, sub duplicatum : 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 */ 3 
mill, longa. (Coll. Nr. 132.) 
Cyclostoma cklorostoma Sow. Thes. N. 156. p. 146. t. 28. f. 168. *) 
— — Chemn. ed. II. N. 117. p. 115. t. 14. f. 1—3. 
— sericeum Fer. Mus. teste Cuming. 
Choanopoma chlorostoma Gray Catal. Cycloph. p. 53. N. 24. 
Adamsiella chlorostoma Pfr. Consp. N. 254. 
Habitat in Demerara (Sowerby). 
C. Operculum oyale, anfractibus paucis, magis minusve 
celeriter accrescentibus, nucleo excentrico. 
XIX. Lithidion Gray. 
Operculum sub circular e , testaceum, anfractibus subrapide 
accrescentibus, carina valida, convexa, subcentrali munitis, 
marginibus simplicibus. Testa depressa, late et aperte umbi- 
licata ; apertura subcircularis ; peristoma simplex, tenue vel in- 
crassatum. 
Lithidion Gray in Catal. Cycloph. Brit. Mus. p. 35. 
— Pfr. in Zeitschr. f. Malak. 1851. p. 156. Consp. p. %8. 
Cyclostoma (spec.) Sowerby , Petit , Pfr. 
t 1. Ii* sulcatum 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. 1. c.) 
