CYCLOTUS §. I. 
29 
Cyclostoma subrugosurn Sow. Thes. Siippl. N. 186. p. 161* t. 31 B. 
f 308. 309. *) 
— — Chemn. ed. II Cycl. N. 334. t. 42. f. 19. 20. 
Cyclotus subrugosus Pfr. Consp. N. 21. 
Habitat in insula Jamaica:. 
22. ©• Duffianus Adams. 48 
T. magna, discoidea, rubella albaque; anfr. 4*/. 2 cylin- 
dracei; umbilicus latus, profundus; margo simplex. — Operc. ? 
— Diverg. 150° ; lat. max. 1,9, lat. min. 1,45, alt. 0,87". (Ad.) 
Cyclostoma Duffianum Adams in Proc. Bost. Soc. 1845. p. 11. 
Aperostoma Duffianum Pfr. in Zeitschr. f. Mai. 1847. p. 104. 
Cyclotus ? Duffianus Gray Catal. Cycloph. p. 7. N. 5. 
— — Pfr. Consp. N 22. 
Habitat in insula Jamaica. 
23 . ©. cra§su§ Adams. 49 
T. umbilicata, conoideo-depressa, solida, confertim striata, 
virenti-fusca vel saturate brunnea ; spira breviter conoidea, 
apice lutescens , acutiuscula ; sutura mediocris ; anfr. 5 con- 
vexi, ultimus obsolete spiraliter striatus, superne leviter cor- 
rugatus, basi convexiusculus , circa umbilicum mediocrem vix 
vel non compressus; apertura obliqua, angulato-ovalis , intus 
livida, nitida; perist. continuum, breviter adnatum, marginibus 
angulo subacuto junctis , dextro recto, simplice, sinistro in- 
crassato, subreflexo. — Operc. immersum, 7-spirum, lamina 
spirali elevata, brevissime reflexa. — Diam. maj. 18, min. 15, 
alt. 10 mill. Ap. 10 mill, longa, 8 lata. (Coll. Nr. 15.) 
Cyclostoma crassum Adams Contrib. to Conch. N. 8. p. 143. 
— — Chemn. ed. II Cycl. N. 359. t. 44. f. 14—16. 
Cyclotus crassus Pfr. Consp. N. 23. 
Habitat Manchester insulae Jamaicae. 
24. ©. pei*g»alSid@is Adams. *f- 50 
T. umbilicata, subturbinata , subtiliter rugoso - striata, 
albida, epidermide pallide virenti-fusca induta; spira modice 
*) T. suborbiculari , depressa, rugulosa, alba; spira depressa, obtusa, 
apice prominulo ; anfr. 4 rotundatis, postice depressiusculis ; sutura distincta, 
linea obsoleta subsuturali notata ; apertura fere circulari ; peritreraate pos- 
tice subincrassato , intus prope umbilicum , tenui , ab ultimo anfraetu dis- 
juncto ; umbilico magno, antice carinato. (Sow. 1. c„) 
