192 



GLOSSARY. 



Contorted, kon-tort-ed, twisted. 



CoNTORTUS, con-tort-uss, twisted. 



Contractile, kon-trak-til, having 

 the power of shortening or draw- 

 ing itself into smaller dimen- 

 sions. 



Convex, kon-veks, rising into a 

 circular form, the opposite of 

 concave, or hollow. 



CORNEUS, korny-uss, 1 



Cornea, korny-ah, / horny. 



CORNEUM, korny-um, ) 



Corvus. See note p. 189. 



Costata, koss-tate-ah, ribbed. 



Cristata, kriss-tate-ah, crested. 



Crystalline, kristal-lme, like 

 crystal, clear, transparent, 



Crystallinus, kriss-tally-nuss, 

 resembling crystal. 



Curt A; kurt-ah, short. 



Curvirostris, kurvy-ross-triss, 

 with curved beaks. 



Cyclostoma, sy - klosstom - ah, 

 round-mouth. 



Cyclostomatid^, sy-klosstom-at- 

 id-ee, a family of molluscs. 



Cygnea, signy-ah, belonging to 

 swans. 



Cylindrical, sill-indrik-al, in the 

 form of a cylinder. 



Deciduous, de-sid-you-us, falling 

 off ; applied to parts of an animal 

 which are not permanent, but 

 fall off during its lifetime, as in 

 some species of shells the hairs or 

 bristles, in otht-rs the apex, or 

 some of the upper whorls. 



Decollata, de-koll-ate-ah, be- 

 headed. 



Decollated, de-koll-ate-ed, taken 

 off from the neck, beheaded. 



Decorticated, de-korty-kate-ed, 

 peeled, stripped of the baik, ap- 

 plied to shells when the epidermis 

 • is rubbed off. 



Denticle, denfy - kl, a small 

 tooth. 



Denuded, de-new-ded, stripped, 

 made naked. 



Depressa, de-press-ah, pressed 

 downwards. 



Depressed, de-press'd, pressed 

 down. 



Depressiuscula, de-pressy-ussk- 

 youl-lah, slightly depressed. 



Dextral, deks-tral, on the right 

 hand; a spiral shell is dextral 

 when the mouth or aperture 

 faces the observer's light hand, 

 the shell being held with the 

 apex upwards. 



Dextrorsa, deks-tror-sah, turned 

 to the right. 



Diameter, di-ammy-tur, a line 

 which passing through the centre 

 of a circle, or other cuivilinear 

 figure, divides it into two eqoal 

 parts. 



Diffused, dif-fews'd, dispersed, 

 scattered, widely spread. 



Dilatatus, di-lay-tate-us, en- 

 larged, expanded. 



Dilate, de-late, to widen, to 

 spread out. 



DiLLWYNii, Dill-winny-i, named 

 after Mr. Dillwyn. 



Disc {Lot. discus), a round flat 

 plate ; in ancient times a quoit 

 made of stone, metal, or wood, 

 either with or without a hole in 

 the middle ; it differed from the 

 quoit of the present day in being 

 flat on both sides. 



DisciFORMiS, dissy-form-iss, disc- 

 shape 1 



Discoid, diss-koid, resembling a 

 disc. 



Diverge, de-vurj, to extend in 

 different directions from the same 

 point. 



Dorsal, dor-sal, belonging to the 



back. 

 Draparnaldi, drap - ar - nal - di, 

 mmed after Draparnaud, a cele- 

 brated French conchologist. 

 Dreissena, Dry-see-nah, named 

 after M. Dreissens. 



