16 AURICULID2E. 



upper ones flat, eroded, the last forming about three-fourths of 

 the total length, slightly angled near the suture, spirally striated 

 above and in front, attenuated downwards, and rather com- 

 pressed near the umbilical region ; aperture elongately semi- 

 ovate, narrower in the middle, rather rounded in front, fuscous 

 within ; one tubercle-shaped parietal plait ; columellar plait 

 scarcely prominent, twisted, nearly vertical ; peristome acute ; 

 right margin somewhat inflexed in the middle, furnished within 

 with close-set livid transverse ridges, several of which are longer ; 

 columellar margin short, callous, appressed. Length 13, breadth 

 8 mill. 



Melampus Liberianus, H. and A. Adams in Proc. Z. S. 1854, 

 p. 12. n. 37 ; Gen. rec. Moll. ii. p. 243. 



Pfr. Syn. Auric, n. 9 ; Novit. Conch, i. p. 21. n. 35. t. 6. 

 f. 13, 14 ; Mon. Auric, p. 23. 



Hob. Liberia, West Africa (Dr. Parkins). 



12. Melampus olivula. 



Shell rather imperforate, obovate, rather thin, smooth, green- 

 ish-grey, with indistinct whitish bands and streaks; spire 

 short, conoidal, mucronate ; suture linear ; whorls eight, exceed- 

 ingly narrow, flat, the last forming five-sixths of the total 

 length, convex above, then somewhat angular, gTadually less- 

 ened towards the base; aperture scarcely oblique, oblong, round- 

 ed in front ; one minute parietal plait below the middle ; colu- 

 mellar plait small, oblique ; peristome acute ; right margin fur- 

 nished within with about twelve white transverse ridges ; 

 columellar margin callous, nearly affixed. Length 11, breadth 

 1\ mill. 



Auricula olivula, Moric. in Mem. Geneve, viii. (?). 



D'Orbiqny, Synops. p. 23. 



Kiist. Auric, p. 33. t. 3. f. 11-13. 

 Melampus olivula, Beck, Ind. p. 107. n. 11. 



H. and A. Adams in Proc. Z. S. 1854, p. 11. n. 17. 



Pfr. Syn. Auric, n. 10; Mon. Auric, p. 23. 

 Tralia olivula, H. and A. Adams, Gen. rec. Moll. ii. p. 244. 



Hub. Bahia, Brazil and Guayaquil, Columbia (Z) 1 Orbigny). 



13. Melampus parvulus. 



Shell imperforate, ventricose ovate, rather thin, striated ; 

 whitish, covered with a greenish-black periostraca ; spire short, 

 convexly conoidal, pointed ; suture impressed, irregular ; whorls 

 six to seven, rather flat, somewhat imbricate, the last forming two- 

 thirds of the total length, inflated, gradually attenuated towards 

 the base ; aperture oblique, narrow, acuminately oblong ; one 



