CYCLOPHORIDA. 1 
edge short, straightforward, external edge a little expanded, 
- angular, inflected and dilated above. Operc. typical. Height 
12, greatest breadth 22, least br. 18 mill. 
Valvata hebraica, Less. Voy. de la Coquille, p. 347, t. 13, f. 8. 
Cyclostoma papua, Quoy 5 Gaim. Voy. Astol. ii. p. 185, t. 12, 
f. 23-26; Desh. in Lam. Hist. viii. p. 369, n. 35; Hombr. & 
Jacq. Voy. Pol. Sud. Moll. t. 12, f. 16-19. 
Cyclostoma distomella, Sow. Thes. n. 68, p. 114, t. 25, f. 94; Pfr. 
Ie. n. 91, p. 95, t. 12, f. 4, 5, t. 28, £. 14, 15. 
Aperostoma distomella et hebraicum, Pfr. in Z. f. I. 1847, p. 104. 
Cyclophorus? papua, Pfr. ibid. p. 108. 
Cyclotus distomellus, Gray, Cat. Cycl. p. 7, n. 9. 
Cyclotus hebraicus, Gray, Cat. Cyel. p. 8, n. 10; Pfr. Consp. n. 35; 
Pneum. Mon. p. 35. 
Hab. New Guinea. 
35. CycLtotus ? DISCOIDEUS. 
Shell discoidal, rather solid, slightly striate, white, with a pale 
yellow periostraca ; spire quite depressed, with the apex scarcely 
prominent; suture deep; whorls 43, cylindrical, the last one 
descending anteriorly; umbilicus broad; aperture circular, 
white inside; peristome double; internal edge short, straight, 
appressed, outer edge rather thickened, with the right margin 
broadly expanded. Operc.? Height 7, greatest breadth 20, 
least br. 15 mill. 
Cyclostoma discoideum, Sow. Thes. n. 60, p. 111, t. 25, f. 87, 88; 
Pfr. Ic. n. 153, p. 144, t. 20, f. 1-3; Mouss. jav. Moll. p. 50, 
t. 20, f. 10. 
Aperostoma discoideum, Pfr. in Z. f. M. 1847, p. 104. 
Cyclotus discoideus, Gray, Cat. Cycl. p. 8, n. 11; Pfr. Consp. n. 36; 
Preum. Mon. p. 36. 
Hab. Demerara (Sowerby); Malang, Fava? (Mousson.) 
36. CycLoTUS? OPALINUS. 
Shell orbicular, flattened above, very broadly umbilicate or con- 
cave beneath, diaphanous, smooth, very shining, white, some- 
what opaline; whorls 5, cylindrical, the last one equalling 3 of 
the whole diameter; spire scarcely prominent; suture deep; 
aperture disjoined from the penult whorl, perfectly circular ; 
peristome continued, duplicate; outer edge expanded, some- 
what reflected. Operc.? Height 9.3; greatest breadth 21.2; 
least br. 17.2 mill. (JL) 
Cyclostoma opalinum, Mouwss. jav. Moll. p. 51, t. 5, f. 12. 
Cyclotus? opalinus, Pfr. Consp. n. 37; Pnewm. Mon. p. 36. 
Hab. Malang, Fava (Zollinger). 
