88 CATALOGUE OF PHANEROPNEUMONA. 
Megalomastoma cylindraceum, Pfr. in Z. f. MW. 1847, p. 109, n. 4; 
Consp. n. 182; Pneum. Mon. p. 124. 
Farcimen flavulum, Z7rosch. in Z. f. M. 1847, p. 44. 
Farcimen cylindraceum, Gray, Cat. Cycl. p. 28, n. 1. 
Hab. Portorico? and Teneriffe. 
§ 2. Peristome expanded, thickened. 
2. MEGALOMASTOMA CROCEUM. B. M. 
Shell perforate, oblong-turreted, rather solid, slightly obliquely 
striate, diaphanous, saffron-coloured; spire turreted-conical, with 
the apex rather pointed; whorls 7-8, moderately convex, the 
last one forming about 2 of the whole length; pale anteriorly; 
aperture angularly ovate, proceeding with its base beyond the 
axis, similarly coloured inside; peristome double; inner edge 
continuous, slightly expanded, affixed ; outer edge thickened, 
expanded, white, shortly interrupted on the penultimate whorl. 
Operculum? Length 31, breadth 13 mill. 
Cyclostoma croceum, Sow. Thes. n. 167, p. 150, t. 29, f. 190, 191; 
Pfr. Ic. n. 177, p. 164, t. 24, f. 15, 16. 
Cyclostoma Gooldianum, Petit, Jowrn. Conch. i. p. 45. 
Megalomastoma croceum, Pfr. in Z. f. MM. 1847, p. 109, n. 5; 
Prneum. Mon. p. 125. 
Farcimen croceum, Gray, Cat. Cycl. p. 29, n. 2. 
Hab. Island of Mauritius, Woods near Black River (Benson). 
3. MEGALOMASTOMA BIFASCIATUM. 
Shell deeply rimate, ovate-conical, rather solid, smooth, shining, 
flesh-coloured; spire convexly conical, rather pointed ; whorls 8, 
moderately convex, the last one painted with two broad chest- 
nut-coloured bands, rounded beneath; aperture nearly perpen- 
dicular, angularly ovate; peristome double; inner edge shortly 
expanded and affixed ; outer edge thickened, blunt, with the left 
margin narrow, emarginated on the penult whorl. Operculum? 
Length 33, breadth 15 mill. . 
Cyclostoma bifasciatum, Sow. Thes. Suppl. n. 198, p. 167%, t. 31, B, 
f,. 322, 323; Pfr. Ic. n. 252, t. 36, f. 3, 4. 
Megalomastoma bifasciatum, Pfr. Consp. n. 184; Pnewm. Mon. 
p. 126. 
Hab. Guayaquil (De Lattre). 
4, MEGALOMASTOMA TORTUM. B. M. 
Shell rimate, ovate-oblong, thick, slightly truncate, minutely 
striate, flesh-coloured-yellowish ; whorls 5-6, convex, somewhat 
irregular, the last one lessened, with a compressed keel near the 
e 
