56 GASTEEOPODA. 



* 202. S. Obliquata, Sowerly. Shell ovately oblong, rather 

 depressed, radiately crookedly ridged, vertex uncinate. Ash-brown.- 

 (Reeve.) 



* 2G3. S. Spinosa, Reeve. Shell ovate, rather depressed, apex 

 laterally uncinate, radiately ribbed, ribs rather narrow, profusely 

 squamately spined. Yellowish white. (Reeve.) 



FAMILY ATJRICTJLIDJE. 



Shell spiral ; pillar generally plaited, body of last whorl usually 

 toothed or plaited ; peristorne sharp and straight, or expanded, 

 thickened, often toothed or transversely ribbed. 



Brackish water. 



MELAMPUS. 



Shell ovate-conoidal, or ovate, solid, spire rather short ; aperture 

 elongated, narrow ; columella distinctly plaited, body of last whorl 

 smooth, or furnished with from one to five folds or teeth ; peristome 

 straight ; right margin acute, smooth within, or furnished with trans- 

 verse ridges. 



Australia. Indian Archipelago. Philippines. Ceylon. Mauritius. 

 South Africa. Madeira. West Indies. North and South America. 

 Sandwich Islands. 



* 264. M. COmmoduS, Adams, Proc. Zool. Soc., 1854, p. 12 ; 

 Pfeiffer, Cat. Auric., Brit. Mus., p. 10. Shell rimate, oblong-ovate, 

 rather solid, slightly shining ; chestnut ; spire conic, apex pointed ; 

 suture bordered ; whorls nine, flat, the upper radiately ribbed, the last 

 forming nearly two-thirds of the total length, rather smooth, somewhat 

 turgid above, attenuated at its base ; slightly gibbous and striated ; 

 aperture nearly perpendicular, acuminately semi-ovate ; no plait on 

 penultimate whorl ; columella plait short, oblique, somewhat twisted, 

 forming an indistinct angle with the peristome, which is simple, 

 straight ; right margin scarcely arcuate, slightly sinuate, furnished 

 within with three transverse ridges ; columella margin callous, 

 shining. Length, '44; breadth, '2. (Pfeiffer.) 



265. M. adamsiamiS, Pfeiffer, Cat. Auric., Brit. Mus., p. 17. 

 Shell sub-rimate, ovato-oblong, rather solid, smooth, blackish green; 

 spire couvexly conical, pointed ; suture linear ; whorls nine, flat, the 

 xipper ones somewhat plaited, the last forming two-thirds of the total 

 length, indistinctly angled above, marked near the suture with one 

 larger and several narrow pale bands, irregularly sculptured with striae 

 of growth, rounded in front ; aperture nearly perpendicular, narrowly 

 semi-ovate ; one middle-sized, compressed, transverse plait on the last 

 whorl ; columella plait oblique, produced outwards ; peristome straight, 

 bordered with white ; right margin sinuate above, furnished within 

 with six or seven short white ridges ; columella margin callous, slightly 

 dilated. Length, '4 ; breadth, -2. (Pfeiffer.) 



266. M. ZealandiCUS, Adams, I.e., p. 12 ; Pfeiffer, I.e., p. 17. 

 Shell rimate, conoidally ovate, rather solid, irregularly striated, slightly 

 shining, horn coloured brownish ; spire conoidal, acutely mucronate ; 



