12 



U. 



9 subrostratum channeled — 



1 brevidentatum short-toothed 



1 1 denticulatum small-toothed 



12 armatum single-spined 



13 tectum knob-whirled 



li callosum thick-skinned 



15 Planaxis girdled 



16 Tankervillii Tankerville's Br.Mus. 



17 marginatum margined 



18 Strombiforme strombus-shaped 



19 fulgurans Lightning 



20 chlorostoma thick-lipped ' 



21 Terpsichore small spotted 



22 lineolatum slender lined 



23 roseum rose harp 



