GLOSSARY. 79 



Concentric having the same centre. ConcMfera an old term for the bivalves. 



Constricted narrowed. Convex rounded outwards. 



Cordate shaped like a heart. Coriaceous -leathery. Corneous horny. 



Costate ribbed. Crenate -scalloped. Crenulated finely toothed. 



Cruciate in the form of a cross. 



Crura the basal part of a brachiopod's arms, of which the loop is a further develop- 

 ment. 



Cuneate shaped like a wedge. 



DeCidUOUS falling off. Decollated having lost the apex of the shell. 



Dentated toothed. Denticle a small tooth. Depressed pressed downwards. 



Dextral right-handed. Dextrorse turned to the right. 



Diaphanous transparent , Dilated Expanded. 



Dimyary having two adductor muscles. 



DiOtOCardiac having a heart with two auricles. Dioecious having the sexes distinct. 



DiSCOldal resembling a disc. Diverging radiating. 



Dorsal belonging to the back. DorsibrancMate with gills attached to the back. 



DocoglOSSa a section of the Diotocardia in which the radula possesses only a few strong 

 teeth arranged in rows compared to beams. 



Edentulous toothless. Emarginate notched. Ensiform sword-shaped. 



Entire uninterrupted by breaks or notches. Epidermis the outer skin. 



Epiphragm the hardened mucus with which the mouth of some univalve shells is closed. 



Epipodium- a fold occurring on the upper edge of the foot. 



Equilateral having sides of equal length. 



Eqiltvalve having valves of equal size. Excoriated worn away. 



EuthyneurOUS having the nerves Straight. 



Falciform process that which serves as a point of attachment for the muscles of the 

 foot and viscera. 



Fasciculated arranged in bundles. Ferruginous containing or resembling iron. 



Filament a thread. 



Filibranchiate having the gill filaments unconnected except by surface cilia. 



Filiform like a thread. Flexuous curved. FlUViatile living in rivers. 



Foliaceous leaflike. Foliated composed of thin laminae. 



Fossetta the pit in which the internal ligament is contained. FUSCOUS dark brown. 



Fusiform tapering towards both ends. GibbOUS swollen. 



Glabrous smooth. Globose almost spherical. 



Globular almost globose. Granulated covered with grains. 



Guard the sheath protecting the phragmoccne of certain cephalopods. 



GymnoglOSSa a section of the Monotocardia, having no radula. 



HaliotO id ear-shaped . 



Heteromyary having the anterior adductor muscle smaller than the posterior adductor. 



Hispid bristly. HolOhepatiC having an unbranched liver. 



HolOStomata univalve shells with mouths entire. 



Hyaline glassy. Imbricated overlapping. Inflected bent inwards. 



Inoperculate -without an operculum. Intersected cut across. 



Intorted twisted inwards. Involute rolled inwards. 



Iridescent rainbow-like in colour. 



Isomyary having the adductor muscles of equal size. 



Lamella ted having layers like plates. 



Lamellibranchiata having gills like leaves or plates. 



Lamelliform shaped like a thin plate. Lanceolate shaped like a lance. 



