CYCLOPHORIDZ. 23 
40. CycLhoTUs PLEBEJUS. B. M. 
Shell depressed, globular, rather thin, striate, violaceous-brownish ; 
spire shortly turbinate, rather pointed; whorls 4, convex, 
rapidly increasing, the last one somewhat inflated, whitish near 
the suture and behind the aperture ; umbilicus narrow, open ; 
aperture oblique, circular, chestnut-coloured inside ; peristome 
continued, sharp, forming a duplicate angle at its junction with 
the penult whorl. Opere. typical. Height 84, greatest breadth 
12, least br. 10} mill. 
Cyclostoma plebejum, Sow. in Proc. Z. S. 1843, p. 60; Thes. n. 12, 
p. 94, t. 24, £40; Pfr. Ic. n. 50, p. 56, t. 7, f. 14, 15. 
Aperostoma plebejum, Pfr. in Z. f. Mf. 1847, p. 104. 
Cyclotus plebejus, Gray, Cat. Cyc. p. 7, nu. 7; Pfr. Consp. n. 41; 
Prneum. Mon. p. 38. 
Hab, Island of Luzon, the province Laguna (H. Cuming). 
41. CycLoTUS EXIGUUS. 
Shell subdiscoid, with a rather elevated spire, and with four 
rounded white smooth volutions; suture deeply impressed ; 
aperture circular, with a reflected bordered peritreme ; umbili- 
cus large. Height 6, breadth 10$ mill. (S.) 
Cyclostoma exiguum, Sow. Thes. n. 63, p. 112, t. 25, f. 92; Pfr. 
Te. n. 216, p. 192, t. 28, f. 24. 
Aperostoma exiguum, Pfr. in Z. f. I. 1847, p. 104. 
Cyclotus exiguus, Gray, Cat. Cycl. p.9,n.17; Pfr. Consp. n. 42; 
Pneum. Mon. p. 39. 
Locality unknown. 
Myxostomella, Gray. 
rs 
42, CycLoTUS VARIEGATUS. B. M. 
Shell discoidal, rather solid, minutely striate, pale fulvous, uniform, 
or with chestnut-coloured stripes, bands or square spots ; spire 
flattened, with the apex not prominent, often blackish ; whorls 
4%, moderately convex, the last one cylindrical; umbilicus very 
broad and open ; aperture a little oblique, circular ; peristome 
double; inner edge short, continued; external edge rather 
expanded, dilated above and auriculate near the penult whorl. 
Operc. typical. Height 63, greatest breadth 203, least br. 17 
mill. 
Cyclostoma planorbulum, Sow. Genera of Sh. Cyclost. f. 1; Sow. 
Thes: n. 58, p. 110, t.. 25, £.85; Pfr. Ie. n. 174,p. 16, ¢. 22, £. 
6-16. Not Lamarck. 
Cyclostoma cornu venatorium, Pet. in Journ. Conch. i. p. 48. 
