(IHRY&AME. 147 



Closely allied to the preceding species. M. c rassicostata , 

 Sowb. (lig. 254), is evidently the same. 



M. AURANTiA, Gmelin. PI. 43, figs. 255-258. 



Orange to chestnut or light chocolate color, upper part of 

 whorl encircled by a wliite band. Length, 1-1*5 inches. 



Mauritius, Philijypines, New Zealand, Polynesia. 



M. nanus, Reeve (tig. 257), is a small variety or stunted 

 growth, with the revolving ribs usually finer. 31. 3Iichelinii, 

 Gueriu (fig. 258), is a probable synonym; Sowerby's figure of it 

 is, however, a 31. limhifera. 



M. PROScissA, Reeve. PL 43, figs. 259-262. 



Whitish or yellowish, longitudinally stained with orange- 

 brown, sometimes obscurel}' white-banded in the middle ; inter- 

 stices of the revolving ribs cancellate. 



Length, 1*25-1 '5 inches. Mauritius, New Caledonia. 



31. ruhiginea, A. Ad. (fig. 260), 31. cariiiilirata, Souv. (fig. 

 261), and probabl}' 3L con.^olidata, Sowb. (fig. 262), are syno- 

 nyms — the latter is described from a single specimen, without 

 localit3^ 



M. CRASSA, Swainson. PL 43, figs. 263-265 ; PL 44, figs. 270, 272. 



Chestnut or chocolate color, usuall}^ white-banded above ; 

 whorls faintly striate throughout, striae developing into ribs 

 towards the base. Length, -8-1*25 inches. 



Philippines, on reefs, at low water, Polynesia. 



It is eas}^ to connect 3L Ticaonica, Reeve (figs. 264, 265,270), 

 with this species, and I fear that it is allied too closely with 

 aurantia, as well as with other species of the group. Material 

 collected especiall^^ to show the extent of variation of a species 

 rarely comes into the hands of the conchologist, the collector 

 usually working with the desire to secure as many species as 

 possible. 31. cosligena, Reeve (fig. 272), is probably a sjaionym 

 of crassa, the only diflTerence being the possession of occasional 

 white spots, promiscuously scattered over the surface. 



M. AMBiGUA, Swainson. PL 43, figs. 266, 267, 268. 



Orange-brown, indistinctly white-banded above ; the incised 

 revolving lines are punctate. Length, 1*5-2*5 inches. 



Philippines, Viti Isles ; under coral and stones, at low water. 



