Molluscs: Prosobranchs and Pyramidellid Gastropods: Keys and Notes for the Identification of the SpeciesRev. ed. of: British prosobranch and other operculate gastropod molluscs. 1971. |
Common terms and phrases
absent adapical Alvania anal sinus angulated anteriorly aperture Aperture oval apex apical basal base blunt British Isles broad cephalic tentacles characters The shell coasts colour columella costae and spiral cream ctenidium cyrtoconoid dark deep sutures Diagnostic characters Shell dorsal egg capsules epipodial tentacles flesh foot Fretter Genus glossy growth lines inner lip Jeffreys Key to British last whorl occupies Linné Littorina Lunatia mantle cavity mantle edge mantle skirt marked Mediterranean metapodial metapodial tentacle Montagu Monterosato narrow nearly neck lobe North Sea Norway occurs Odostomia operculum opisthocline ornament pallial tentacle penis penult penult whorl periostracum periphery peristome postlarval whorls proboscis prosobranchs prosocline protoconch Rissoa Rissoidae Shell breadth shell height siphonal canal slightly smooth snout soft bottoms southern species spiral lines spiral ridges spire sublittorally surface sutures tentacles tubercles tumid whorls Turbonilla umbilical groove umbilicus usually varix veliger veliger larvae whorls tumid yellow yellowish