uOiNXHOLOGY.— GLOSSARY. 



105 



Cyclo'stoma. — From the Greek, ku- 

 klos, a circle, and stoma, mouth. A 

 genus of gasteropods (page 48). 



Cyclo'stoma. — Plural of cycloEtoma. 



Cymbu'lia. — From the Greek, kum- 

 balon, hollow. A genus of ptero- 

 poda, commonly called the gondola. 



Cypra'a. — From the Greek, kupris, 

 Venus. Name of a genus of gas- 

 teropods. A cowry. 



Cyfrje'm. — Plural of Cyprsea. 



Cypricar'dia. — From the Greek, ku- 

 pris, Venus, and cardium, a 

 cockle. A genus of the family of 

 Chama'cea. 



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. 



Dj'aphragm. — Midriff. 



Di'branchia'ta. — From the Greek, 

 dis, two, and bragchos, gills — two- 

 gilled. Name of a division of ce- 

 phalopods. 



Dibra'nchi AL (di-hra'nk-eal). — Hav- 

 ing double gills or branchiae. 



Digita'tion. — From the Latin, digi. 

 tus, finger. A pi-ocess resembling 

 a finger. 



Dimya'ria. — From the Greek, dis, 

 two, and muon, 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. 



Dlmya'rl^. — Plural of dimyaria. 



Diphylli'dia. — From the Greek, dis, 

 two, and phullon, leaf. Name of a 

 division of gasteropoda {page 62). 



Discoid. — 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 gasteropoda 

 (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 gasteropoda 

 (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, c, 

 from, and margo, 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, 

 fg- 51). 



E'olidia. — Name of a genus of gaste- 

 ropods (page 65). 



E'olidia. — Plural of Eolidia. 



Epide'rmis. — From the Greek, epi^ 

 upon, and derma, skin. The cu- 

 ticle or si'arf-skin. 



E'auiVALVE. — When the two valves 

 of a bivalve shell are symmetrical 

 they are said to be equivalve (page 

 97). 



Ethe'ria.— From the Greek, aitho, I 

 shine. Name of a genus of the 

 family of Ostracea (page 75). 



Ethe'rle. — Plural of Ether i a. 



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 



