CONCHOLOGY GLOSSARY. 



105 



CYCLO'STOMA. From the Greek, ku- 

 klos, a circle, and stoma, mouth. A 

 genus of gasteropods (page 48). 



CYCLO'STOMA:. Plural of cy clostoma. 



CYMBU'UA. From the Greek, kum- 

 balon, hollow. A genus of ptero- 

 poda, commonly called the gondola. 



CYPR^'A. From the Greek, kupris, 

 Venus. Name of a genus of gas- 

 teropods. A cowry. 



CYPIUE'^E. Plural of Cyproea. 



CYPRICAR'DIA. From the Greek, ku- 

 pris, Venus, and cardium, a 

 cockle. A genus of the family of 

 Chama'cca. 



CYPRI'NA. A genus belonging to 

 a group of Cy'clades. 



CYRE'NA. A genus of the family of 

 Chama'cea. 



DELPHI'NULA. Latin. A little dol- 

 phin. Name of a genus of the 

 family of Trochoides. 



DEN'TATE. From the Latin, dens, 

 tooth. Marked with tooth-like 

 projections. 



DEPRESSED SHELL. When the spire 

 is very flat. 



DI'APHRAGM. Midriff. 



DI'BRANCHIA'TA. From the Greek, 

 dis, two, and bragchos, gills two- 

 gilled. Name of a division of ce- 

 phalopods. 



DIBRA'NCHIAL (di-bra'nk-eal). Hav- 

 ing double gills or branchiae. 



DIGITA'TION. From the Latin, digi- 

 tus, ringer. A process resembling 

 a finger. 



DIMYA'RIA. From the Greek, dis, 

 two, and mudn, muscle. All those 

 bivalves are so called which have 

 two distinct and separate adductor 

 muscles, and consequently two cor- 

 responding muscular impressions 

 on each valve. 



DIMYA'RIA. Plural of dimyaria. 



DIPHYLLI'DIA. From the Greek, dis, 

 two, and phullon, leaf. Name of a 

 division of gasteropods (page 62). 



DI'SCOID. From the Greek, diskos, a 

 quoit, and eidos, resemblance. 

 This term is applied to those uni- 

 valve shells of which the whorls 

 are disposed vertically on the same 

 plane so as to form a disc ; as in 

 the Planorbis (page 44). 



DOLA'BELLA. Latin. A little axe. 



Name of a genus of gasteropods 

 (page 64). 



DO'LIUM. Latin. A tun or tub. 

 Name of a genus of gasteropoda 

 (page 53). 



DO'NAX. Latin and Greek. A reed ; 

 an arrow. Name of a genus of 

 mollusks of the family of Chama'- 

 cea (page 84). 



DO'NACES. Plural of Donax. 



DO'RIS. A sea goddess, the daughter 

 of Ocean and Thetys. Name of a 

 genus of nudibranch gasteropods 

 (page 65). 



DO'RSAL. From the Latin, dorsum, 

 the back. Belonging or relating 

 to the back. 



E'DULIS. Latin. Edible ; that which 

 may be safely eaten. 



EMARGI'NULA. From the Latin, e, 

 from, and mar go, in the genitive, 

 marginis, border or margin. A 

 genus of gasteropods, character- 

 ized by a shell of simple conical 

 form, but having a narrow fissure, 

 extending from the margin to near 

 the summit (page 61). 



ENTIRE OPENING. When the opening 

 of a shell has neither a notch or 

 canal on its margin, it is said to 

 be entire (page 94, and page 50, 

 Jig. 51). 



E'OLIDIA. Name of a genus of gaste- 

 ropods (page 65). 

 . Pl 



lural of Eolidia. 



EPIDE'RMIS. From the Greek, epi, 

 upon, and derma, skin. The cu- 

 ticle or scarf-skin. 



E'QUIVALVE. When the two valves 

 of a bivalve shell are symmetrical 

 they are said to be equivalve (page 

 97). 



ETHE'RIA. From the Greek, aithd, I 

 shine. Name of a genus of the 

 family of Ostracea (page 75). 



ETHE'RIA. Plural of Etheria. 



EXCRE'TORY. Applied to any vessel 

 or duct which transmits the fluid 

 secreted by a gland, either exter- 

 nally or into the reservoir designed 

 to receive it. 



EXTRAVASA'TION. From the Latin, 

 extra, out of, .and vasa, vessels. 

 Escape of fluids from vessels con 

 taining them and the effusion of 



