94 
CYCLOPHORUS §. 10. 
163 71. €?. C aiming! Sowerby. 
T. umbilicata, depressa, subdiscoidea, spiraliter confertim 
sulcata, albida, epidermide olivaceo-fusca fasciatim cincta vel 
strigata; spira parum elevata, rubicunda, submucronata ; anfr. 
5 — 6 convexiusculi, ultimus subdepressus , medio obsolete an- 
gulatus, basi rotundatus, in umbilico latissimo profundo non 
spiraliter sulcatus; apertura obliqua, subovalis, superne angu- 
lata, intus margaritacea ; perist. simplex, rectum, marginibus 
approximatis , callo tenui junctis, columellari perarcuato, sub- 
incrassato. — Operc. corneum, tenue, flavidum, arctispirum, 
margine anfractuum fimbriato - lamellato. — Diam. maj. 49, 
min. 41, alt. 23 mill. (Mus. Cuming, spec. max. Coll. Nr. 60.) 
Cyclostoma Cumingii Sow. in Proc. Zool. Soc. 1832. p. 32. *) 
— — Mull. Synops. p 37. 
— — Desk, in Lam. hist. VIII. p. 367. N. 30. 
— — Sow. Spec. f. 187 — 189. 
— — Reeve Conch, syst. t. 185. f. 19. 
— — Sow. Thes. N. 54. p. 108. t. 24. f. 68. 69. 
— — Chemn. ed II. N. 89. p. 92. t. 12. f. 1—3. 
— striata Lea Trans. Am. Phil. Soc. V. t. 19. f. 77. Obs. I. 
Conf. Fer. Bull. zool. 1835. p. 101. 
Cyclop horns Cumingii Pfr. in Zeitschr. f. Mai. 1847. p. 108. Consp. 
N. 133. 
— — Gray Catal. Cycloph. p. 22. N. 34. 
Habitat in insula Tumaco Columbiae occidentalis (H. Cuming). 
164 72. C. alternans 
T. umbilicata, conoideo-depressa, tenuiuscula, acute mul- 
tilirata, liris alternis minoribus, haud nitens, sub epidermide 
pallide lutescente fugace alba; spira breviter conoideo-elevata, 
obtusiuscula ; sutura subcanaliculata; anfr. 5 convexiusculi, 
ultimus rotundatus; umbilicus mecliocris, conicus; apertura 
parum obliqua, subcircularis ; perist. simplex, rectum, fusco- 
limbatum, subcontinuum, marginibus ad anfr. penultimum callo 
nitido junctis. — Operc. membranaceum , planum, cereum, 
*) T. orbiculari, subdepressa, albicante, epidermide fusca; spira eleva- 
tiuscula, carnea; anfr. 5 — 6 rotundatis , spiraliter sulcatis; sutura subdecur- 
rente; apertura fere circulari, obliqua, alba, superne subacuminata, peritre- 
mate simplici subincrassato ; umbilico maximo ; operculo corneo, tenui, spi- 
rali, anfractibus plurimis , margine fimbriato. — Lqng. l'/, 0 , lat. 2 poll. 
(Sow. 1. c.) 
