24 CYCLOTUS $. 1. 
38 12. €. suturalis Sowerby. 
39 
T. late umbilicata, discoidea, tenuiuscula, striatula, oliva- 
ceo-cornea; spira vix emersa, mucronulata; sutura profunda, 
canaliculata, marginata; 'anfr. 4 convexiusculi, juxta suturam 
linea distineta, impressa notati, ultimus subdepressus, antice 
breviter descendens, subsolutus; apertura vix obliqua, circu- 
laris; perist. continuum, superne subangulatum, simplex, 
rectum, margine dextro superne antrorsum subarcuato. — 
Opere. testaceum, extus valde concavum, arctispirum, margine 
anfractuum (circa 6) elevato, membrana fimbriata munito. — 
Diam. maj. 13, min. 10'/, alt. 5 mill Ap. diam. 5 mill. 
(Mus. Cuming. et Coll. Nr. 9.) 
Cyclostoma suturale Som. in Proc. Zool. Soc. 1843, p. 29. *) 
— —::. 18070. "Thos. N. 1.:p.,91. 1. 99. fal (9. 
— — . Chemn. ed.II. Cycl. N. 109. p. 109. t. 12. f. 10— 12. 
Aperostoma suturale Pfr. in Zeitschr, f. Mal. 1847, p. 104. 
Cyclotus suluratis Gray Catal, Cycloph, p. 7. N. 8. 
— — . Pfr. Consp. N..12. 
Habitat in. Demerara (Dainbridge), in insula Jamaica ( Adams). 
13. €. distinctus Sowerby. 
'T. late umbilieata, discoidea, tenuis, striis confertis excen- 
tricis et liris subeonfertis, alternis minoribus, spiralibus munita, 
albida; spira plana, apice vix prominula; sutura profunde 
incisa, canaliculata; anfr. 9'/, vix convexiusculi, ultimus de- 
pressus, latior quam altus, antice solutus; apertura subver- 
ticalis, subeireularis; perist. simplex, continuum, rectum, acu- 
tum, margine sinistro expansiusculo. —  Operc. testaceum, 
planum, arcüspirum, membrana floecosa vestitum. — Diam. 
maj. 14, min. 10'/,, alt. 5'/, mill. Ap. oblique 5'/, mill. longa. 
(Coll. Nr. 10.) 
Cyclostoma distinctum Som. 'Thes. N. 47. p. 106. t. 24. f, 38. **) 
m — Chemn. ed, XL. N. 155, p- 146. 1. 20. f2/7— 9; 
— . - grbella (Lam.) Petit Journ. Conch. 1850. I. p. 48. 
*) T. orbiculato-depressa, tenui; epidermide olivacea induta; anfr, 3— 4 
rotundatis, transversim tenuissime striatis; apertura circulari, superne emar- 
ginatione obsoleta; peritremate tenui, margine acutiusculo ; umbilico patulo; 
operculo concinne spirali. (Sow. l. c.) : 
**) T. orbiculari, depressa, fere planorbula, tenui, alba; spira depressa; 
anfr. 4 distinctis, rotundatis, spiraliter suleatis; apertura circulari; peritre- 
mate tenuissimo, acuto. (Sow. l. c.) 
