78 PLACOSTYLUS, SOLOMON IS. 



b l . Oblong, 2-J early whorls punctate ; light reddish-brown, 

 with triangular chestnut spots ; lip pinkish-brown. 



tdiginosus and hobsoni, p. 91. 



b' 1 . Oblong, 2^ early whorls punctate ; white or yellowish 



with yellow or brown spots or patches, the aperture 



and lip pure white ; columellar fold and parietal 



tubercle moderate hargravesi, p. 93. 



a 1 . Yellow or greenish, somewhat streaked with brown. 



b. Lip expanded; aperture and lip white; columellar 

 fold strong; a parietal tooth developed; corrugation 

 of the surface rather coarse. scottn, p. 90. 



b 1 . Lip well reflexed ; columellar fold weak ; spiral sculp- 

 ture fine. stutchburyi, p. 88. 

 B. Surface not corrugated spirally. 



a. White or very pale, thin, openly rimate or umbilicate, the 

 spire slender ; columellar fold weak or wanting, no parietal 

 tubercle. 



b. Aperture decidedly more than half the length of the 

 shell ; surface coarsely plicate, columellar fold often 

 subobsolete. miltocheilus^ p. 94. 



b 1 . Aperture about half the total length ; surface smooth ; 

 columellar fold moderate. sellersi. p. 95. 



a 1 . Reddish or tawny, denuded of cuticle, solid, 3J early whorls 

 punctate ; columella concave with a strong spirally coiled 

 fold, leaving a " false umbilicus" which penetrates to the 

 apex. cleryi, p. 96. 



a 2 . Covered with a brown, yellow or olive cuticle ; umbilicus 

 narrow or closed ; about 2^ early whorls punctate. 

 b. Outer lip decidedly reflexed, recurved at the edge. 

 c. Spire decidedly attenuated above ; lip white. 



strangei, p. 87. 



c 1 . Spire conic, not attenuated ; lip brown ; smooth- 



ish. palmarum, p. 85. 



c 2 . Spire conic, stout; surface densely and finely 



malleate spirally. stutchburyi* p. 88. 



b 1 . Outer lip expanded, or not, hardly reflexed, though 



often thickened within. 



c. Surface with microscopic waved spiral lines, 

 weak but visible in places. 



