DIfHANITE 



104 



DIRECTEIX 



Diphanite, (difa-nit). A variety of margarite. 



Diphenyl, (di-fen'il). pi and Phenyl, q.v.]= 

 (C 6 H 5 )2=Phenyl phenylide=Phenyl: a pearly 

 crystalUne solid; the molecular form of 

 phenyl, q.v. 



Diphyes, (di-fi'ez). [Gk. dis, twice; phyo, I 

 produce.] 1. A genus of sea-nettles, belong- 

 ing to Hydrozoa, named from having a double 

 structure. 2. A plant=Bolbophyllum adeno- 

 petalum. 



Diphyodonts, (di-fi'o-donts). [Gk. dis, twice; 

 phyo, I produce; odous, tooth. ] = Hetero- 

 donts: named from having two successive sets 

 of teeth; includes all Mammalia, excepting 

 Monotremata, Edentata, and Cetacea 



Diplaoanthus, (dip-la- kan'thus). [Gk. diplax, 

 double; akantha, spine.] A fish, belonging 

 to Acanthodii, known only by fossil remains 

 in Old Red Sandstone. 



Diplatinamine, ( di-plat'in-a-min ). =PtH 12 N 4 

 O 2 . v. Platinum bases. 



Diplatosamine, (dI-plat'o-sa-rmn)=PtH 10 N4. 

 2H 2 O: Reiset's first base. v. Platinum bases. 



Diplocidaris, (dip-lo-sid'a-ris). [Gk. diploos, 

 double; kidaris, tiara.] A sea-urchin, hav- 

 ing two rows of ambulacral pores. 



Diploctenium. [Gk. diploos, double; cteis, 

 comb.] A coral found in Lower Chalk. 



Diplodonta. [ Gk. diploos, double ; odous, 

 tooth.] A fossil mollusc, resembling the 

 cockle, found in Eocene rocks. 



Diplograpsus, (dip-lo-grap'sus). [Gk. diploos, 

 double; Grapsus.]=Double graptolites: those 

 having two rows of cells, found in Llandeilo 

 Hags. 



Diplopoda, ( dl-plop'o-da ). [Gk. diploos, 

 double; pous, foot.]=ChJlognatha: animals 

 belonging to Myriapoda, in which each som- 

 ite of the body has two pairs of legs. 



Diploptera, (dl-plop'ter-a). [Gk. diploos, double 

 or folded ; pteron, wing.J Wasps, hive-bees, 

 &c. ; insects belonging to Hymenoptera; 

 named from 



Diplopterus, (di-plop'ter-us.) [Gk. diploos, 

 double; pteryx, fiu.J A fish, known only by 

 fossil remains. 



Diplopy, (di'plo-pi). [Gk. diploos, double; 

 ops, eye.] A diseased condition of the eyes, 

 which causes double images of objects to ba 

 seen. 



Diplotaxis, ( dip-lo-taks'is ). [Gk. diploos, 

 dotible; taxis, order.] = Rocket = An herb 

 with yellow flowers, belonging to Brassicacea;, 

 named from its seeds being in two rows. 



Dipnoa, (dip'no-a). [Gk. dis, double; pnoe, 

 breath.] Used by Owen for a division of 

 reptiles, including Batrachia and other 

 water-breathing reptiles. 



Dipnoi, (dip'noi). [Gk. dis, twice; pnoe, 

 breath. ]= Double breathers: fishes, such as 

 the mud-fish, which connect fishes with rep- 

 tiles; also called Diplopnoi and Protopteri. 



Dipoda, (di'pod-a). [Gk. dis, twice; pous, 

 foot.] Aristotle's name for Bimana. 



Dipodidae, (di-pod'i-de). [Dipus, q.v.]=Jei-- 

 boas: small animals belonging to Rodentia, 

 having long hind legs. 



Dipotassic, (di-pot-as'sik). [Di and Potassic, 

 q.v.] v. Potassic. 



Dippel's oil=Bone-oil, q.v. 



Dipping needle, (dip'ping). 

 magnetised needle, or 

 small compass, sus- 

 pended by its centre so 

 as to move freely in a 

 vertical plane, when it 

 points directly to the N. 

 or S. magnetic pole, 

 whichever be the near- 

 est, thus marking the 

 dip of the place where 

 it is suspended. 



Dipriacanthus, (di-pri-a- 

 kan'thus). [Gk. dis, Dipping-needle. 

 twice; prisis, saw; akantha, spine.] A pla- 

 giostomous fish, known only by fossil spines; 

 found in Coal formation. 



Dipropyl, ( di'pro-pil )=(C 3 H 7 )2=Ditrityl : a 

 hydrocarbon obtained from the distillation 

 of cannel coal. The molecular form of pro- 

 pyl, q.v. 



Diprotpdon, (dl-pro'to-don). [Gk. dis, twice; 

 pro, in front; odous, tooth.] A very largo 

 kangaroo, known only by fossil skull and 

 bones, found in Upper Pliocene rocks, iu 

 Australia. 



Dipsacaceae, (dip-sa-ka'se-e). [Dipsacus, q.r.] 

 = Teazle-worts: herbs and shrubs, with capi- 

 tate flowers and tubular corollas, belonging 

 to Campanales. 



Dipsacus, (dip'sa-kus). [Gk. dipsao, I thirst.] 

 =Teazel: an herb, the type of the order Dip- 

 sacaceae; named from the leaves holding 

 water. 



Diptera, (dip'ter-a). [Gk. dis, twice; pteron, 

 Aving.]= Flies, fleas, and gnats; insects hav- 

 ing only two wings. Fleas, though having 

 no wings, are sometimes considered to belong 

 to this order. 



Dipteracese, (dip'tgr-a'se-e). [Dipterocarpus, 

 the typical geuus.]=Dipterads : large East 

 Indian resinous trees, with large flowers, be- 

 longing to Guttiferales ; named from the 

 form of its calyx. 



Dipterix, (dip'ter-iks). [Gk. dis, twice; pteryx, 

 wing.] Named from shape of calyx: a tree 

 belonging to Fabacese. D. odorato=Jonk& 

 bean; also called Tongo or Tonquin bean. 



Dipterus, (dip'ter-us). [Gk. dis, twice; pteryx, 

 fin.] A ganoid fish, known by fossil remains 

 found in Old Red Sandstone. 



Dipus, (di'pus). [Gk. dis, twice; pous, foot.] 

 =Jerboa, Gerbillus, &c. = Jumping mice: 

 small quadrupeds, forming a division of 

 Muridse, having long hind legs, and living 

 on grain, &c., in fields. 



Dipyre, (di'pir). [Gk. dis, twice; pyr, fire.] 

 A silicated mineral. 



Direction angle, (di- 

 rek'shun). [L. dirigo, 

 I set straight.] The 

 angle formed by the 

 lines of action of two 

 forces. 



Directrix, (dl- relit'-' 

 riks). [L. directus, 

 straight.] A straight Directrix, 



line at right angles to the axis of a conic 



\ 



