EOSINE. 



[ 292 ] EPENDYMA VENTRICULORUM. 



branched ; male and female organs in 

 each individual. 



Amphistoma, Diplozoon (Diporpa), 

 Distoma (Cercaria), Gyrodactylus. 

 Fam. 3. ACANTHOCEPHALA. Body flat- 

 tened, transversely wrinkled, becoming 

 cylindrically distended by the imbibi- 

 tion of water ; sexual organs in separate 

 individuals. 



Echinorhyn ch us. 



Order 2. Ccelelmintha. Alimentary canal 

 present, distinct, simple, with two orifices. 

 Fam. 4. NEMATOIDEA (round worms). Body 

 cylindrical, hollow ; sexes separate. 



TrichocephaluSj Filaria t A8caris( Oxy- 

 urus), Anguittula, Trichina, Anchylo- 

 stoma, Dochmius. 



See ACEPHALO CYSTS and ENOPLIPJE. 



BIBL. Siebold, Vergl. An.; Rudolphi, 

 Entoz. Hist. Nat. and Entoz. Syn. ; Dujardin, 

 Helminth. ; Bremser, Icones Helminth. ; 

 Owen, TodcFs Cyd. ii. Ill; Blanchard, Ann. 

 Sc. Nat. 3 s6r. Zool. vii. viii. x. xi. xii. ; 

 Diesing, Helminth. ; Yogt, Zool. Brief e ; 

 Beneden, Vers cesto'ides, 1850 ; id., Vers in- 

 testin. (27 pi.), and Icon. d. Helm. 1860 ; 

 Pagenstecher, Trematod-Larven ; Kiichen- 

 meister, Parasiten, 1881; Cobbold, Para- 

 sites ; Eberth, Nematoden, 1863 ; Schneider, 

 Nematoden (22 pi., 130 cuts), 1866 ; Da- 

 vaine, Entozoaires, 1877 ; Linstow, Helmin- 

 thol 1878; Wagener, Cestoden (22 pi.); 

 Leuckart, Menschl. Parasit. 1881. 



EO'SINE. A beautiful rosy dye, having 

 the composition of tetrabromo-fluorescine, 

 produced by the action of bromine upon 

 fluorescine dissolved in acetic acid. It is a 

 rapid staining agent, dyeing the protoplasm 

 of nucleated blood-corpuscles, but not the 

 nuclei ; it is also useful in the distinction of 

 nerve-structures. 



BIBL. Gibbes, Hist.-, Dreschfeld, Jn. Anat. 

 xi.; Watts, Dirt.Ckem.; "Wissozky, Schultze's 

 Arch. 1877, xiii. 479. 



EOS'PHORA, Ehr. A genus of Rota- 

 toria, of the family Hydatiuaea. 



Char. Eyes three, sessile two frontal, 

 one cervical; foot forked. Freshwater. 

 Among Conferva. 



There are three species. 



E. digitata (PI. 43. fig. 28 : fig. 29, teeth). 

 Body conical, hyaline, not auricled, toes 

 one third of the foot in length. Length 



BIBL. Ehr. Infus. p. 451. 



EOZO'ON,Dawson. A Foraminifer,with 

 hyaline and tubular shell-structure, and 

 very numerous irregular chambers. Out- 

 spread for about a square foot, and heaped 

 up nearly half as high, with diminishing- 

 size, it occurs imbedded in the Lauren- 

 tian and other old limestones of Canada, 

 Bohemia, &c. The chambers,' stolons, 

 pseudopodial passages, and canal-system are 

 represented by delicate casts of magnesian 

 silicates, such as pyroxene, serpentine, and 

 loganite ; sometimes by calcite, like that of 

 the shell itself. In the former case they 

 can be separated by the removal of the cal- 

 careous shell in slices of the marble, by 

 dilute acid. 



Layer after layer of Eozoon formed banks, 

 thus constituting a large proportion of the 

 massive limestones; and the sarcode was 

 mostly replaced by hydrous silicates, such 

 as have been injected into the pores of Si- 

 lurian and other fossils, and just as glauco- 

 nite takes the place of the soft parts of 

 Foraminifera, Polyzo'a, &c. in existing 

 seas. The Eozoonal limestone, with its 

 associated muds, sands, and shingle, has 

 been folded, crushed, and variously meta- 

 morphosed, often in a high degree. 



BIBL. Logan, Dawson, Carpenter, and 

 Hunt, Quart. Jn. Geol. Soc. 1865, xxi. 45, 

 and 1867, xxiii. 257; Carpenter, Intel 

 Observ. 1865, vii. 278; and Microscope, 1881; 

 Giimbel, Sitz. layer. Akad. 1866; Zirkel, 

 Mineralien, 1873 ; Mcebius, Eoz. Can. 1878 ; 

 King and Rowney (disputing the organic 

 character of Eozoon), Proc. Roy. Irish 

 Acad. ser. 1. x. and ser. 2. i. ; & An Old 

 Chapter fyc. 1881. 



^ EPEI'RA, Walck. A genus of Arach- 

 nida, of the order Araneidea. 



E. diadema (the common autumnal gar- 

 den-spider) forms a favourable object for 

 the examination of the various structural 

 peculiarities of spiders, as the integument 

 (PI. 6. rig. 4) ; the legs, with their hairs and 

 claws (tig. 8, a, 6); the toothed hairs at 

 the end of the feet (fig. 8) show very clearly 

 the transition from the hairs to the claws, 

 in fact, that the latter are mere modifica- 

 tions of the former ; also the lung-plates 

 (figs. 9, 9 b) ; the spinnerets, the web (fig. 

 11), &c. 



BIBL. Walckenaer, Apteres ; Brandt, 

 Medizin. Zool. ; Walker, Brit. Spid. (Itay 

 Soc.}. 



EPEN'DYMA VENTRICULORUM is 



