54 



A GLOSSARY OP TERMS 



DIDY'XAMOUS. Relating to didyna- 

 mia. 



DIDYXA'MIA. fr. gr. dis, two; du- 

 namis, power. Name of a Lin- 

 njjean class of plants, having two 

 long and two shorter stamens. 



DIFFORM. Irregular; having two 

 forms. 



DIFFRACTED. Twice bent. 



DIGITA'TA. Lat. Digitate. 



DI'GITATE. fr. lat. digitus, finger. 

 Spread out like finyers. 



DIGITA'TION. fr. lat. digitus, finger. 

 A process resembling a finger. 



DI'GITIFORM. Formed like fingers. 



DI'GITI GRADE. Applied to animals 

 that walk without resting the 

 whole foot on the ground. 



DIGITIGRADA. fr. lat. digitus, a fin- 

 ger or toe ; gradus, a step. Name 

 of a tribe of animals that in 

 walking rest only their toes on 

 the ground. 



DIGO XA. fr. gr. dis, two; gone, an- 

 gle. Having two angles. 



DIGY'XIA. fr. gr. dis, two; gune, 

 pistil. Name of an order of 

 plants. 



DIGY'XOUS. Having two styles or 

 female organs. 



DILATA'TA. Lat. Dilated ; swelled 

 out. 



Dnu'vi4L. Relating to dilu'vium. 



DILU'VIOX. ) fr. lat. diluo, I wash 



DILU'VIUM. away. A superfi- 

 cial deposit, (p. 92, Book viii). 



DIMID'IATE Halved ; divided into 

 two parts. 



DIMO'RPHOUS. fr. gr. dis, twice; 

 morphe, form. Applied to mine- 

 ral substances which naturally 

 assume two crystalline forms, as 

 carbonate of lime ; bisulphuret of 

 iron, &c. There are about twenty 

 dimorphous minerals. 



DIMYA'RIA. fr. gr. dis, two ; mudn, 

 muscle. All those bivalves are 

 so called which have two distinct 

 and separate adductor muscles, 

 and consequently two correspond- 

 ing muscular impressions on each 

 valve. 



. Lat. plur. of dimyaria. 



DIXO'RXIS. fr. gr. deinos, great, ter- 

 rible ; onus, a bird. A genus of 

 fossil, or extinct birds. 



DIXOTHE RIUM. fr. gr. dinos, circu- 

 lar ; therion, a beast. A fossil 

 pachyderm, (p. 86, Book viii). 



DI'ODOX. fr. gr. dis, twice; odous, 

 odontos, tooth. Systematic name 

 of a genus of fishes which have 

 but two teeth. 



DICE'CIA. fr. gr. dis, two; oikia, 

 house. Name of a Linnaean class 

 of plants, characterized by hav- 

 ing the stamens and pistils in se- 

 parate flowers. 



DKE'CIOUS. Relating to dicecia. 



DIOME'DEA. The ancient name of 

 certain birds of the island of Dio- 

 medes, near Tarentum, which 

 were said to receive the Greeks 

 favourably, and to attack the bar- 

 barians. The systematic name 

 of the albatross. 



DIOXJE'A. One of the names of 

 Venus. A genus of plants. Di- 

 oncea musci'pula. Venus' fly-trap. 



DI'ORITE. A variety of trap rock 

 consisting of albite and horn- 

 blende. 



DIP. Direction of the inclination 

 of strata. "To take a dip," is to 

 measure the degree that a stra- 

 tum inclines or dips from a hori- 

 zontal line. (p. 185, Book viii). 



DIPE'TALOUS. fr. gr. dis, two ; peta- 

 Ion, a petal. Having two petals. 



DIPHYLLI'DIA. fr.gr. dis, two; phul- 

 lon, leaf. Name of a division of 

 gasteropods. (p. 62, Book v). 



DI'PLO-GAXGLIA'TA. fr. gr. diplous, 

 double; gagglion, nerve-knot. The 

 name given by Dr. Grant to the 

 Articulata of Cuvier. 



DIPLO-XEURA. fr. gr. diplous, dou- 

 ble; neuron, a nerve. Dr. Grant's 

 designation of a class of animals 

 embracing the various forms of 

 worms in which the nervous sys- 

 tem is arranged on the same plan. 



DIP'TEHA. fr. gr. dis, two ; pteron, 

 wing. An order of insects. 



