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, I 



Cornea, korny-ah, J horny. 



Corneum, korny-um, j 



CoRVUS. See note p. 189. 



CosTATA, koss-tate-ah, ribbed. 



Cristata, kriss-tate-ah, crested. 



Crystalline, kristal-line, like 

 crystal, clear, transparent. 



Crystallinus, kriss-tally-nuss, 

 resembling crystal. 



CurtA; kurt-ah, short. 



CuRViROSTRis, kurvy-ross-triss, 

 with curved beaks. 



Cyclostoma, sy - klosstom - ah, 

 round-mouth. 



Cyclostomatid^e, 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. 



D. 



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 others 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 bark, ap- 

 plied to shells when the epidermis 

 is rubbed off. 



Denticle, denty - 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 obsei-ver's light band, 

 the shell being he'd 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 curvilinear 

 figure, divides it into two equal 

 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 {Lat. 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- 

 shaped. 



Discoid, diss-koid, resembling a 

 disc. 



Diverge, de-vurj, to extend in 

 different directions from the same 

 pomt. 



Dorsal, dor-sal, belonging to the 

 back. 



Draparnaldi, drap - ar - nal - di, 

 named after Draparnaud, a cele- 

 brated French conchologist. 



Dreissena, Dry-see-nah, named 

 after M. Dreissens. 



