History of British animals - University of Guam Marine Laboratory

328 MOLLUSCA. SOLENOSTOMATA.SOLENOSTOMATA.I. Shell convoluted. The whorls are small segments of largecircles, wrapped round the pillar, the last formed one embracingor inclosing the preceding one : aperture lengthened.A. Conusid;e. Shell compressedly convoluted ; aperture linearand simple, with a small lid. Proboscis long, tentaculaproduced, with the eyes near the summit, on the outside.Conns.Terebellum.Seraphs.B. Cyvrjexdje. Shell, involute ; outer-lip incurved, plaited ;no lid. Cloak enlarged, and capable of folding over theshelLCyprrea(Cypreovula.)C. Ovulad-'e. Shell involute ;both extremities of the apertureending in a canal. Cloak enlarged, and capable offolding over the shell.(Ovula.)Volva.Calpuma.D. Voeutadje. Shell with a single anteal canal, not produced;pillar with oblique folds.Voluta."Volvaria.Mitra.Cancellaria.E. Mahginellad^e. Outer-lip thickened ; pillar plaited.Marginella.Columbella.Y. OrivADJE. A spiral callous ridge on the base of the bodywhorl,joining the pillar.Oliva.Ancillaria.G. Tornatelladj.. Canal circumscribed, effuse.Tornatella.Acteon.H. Bellerethon. Involute, aperture transverse, simple,with a sinus in the outer-lip.