TRACHELIUS. 



[ 776 ] 



TRAGACANTH. 



/ Mouth ter- 

 rninal. 



w 



o 



< 



Month not 

 terminal. 



Synopsis of Genera. 



/■Anterior part of ^ Body more or less cylin- /Mouth on the summit 



I body with a J drical, moving by-^ of the appendage 



conical appen-j turning on axis. \ Mouth at its base 



dage. I Body flat, swims without turning on axis 



C (f^n i„o, ,„„ /^Body attenuate infront 



I No inter- J '-°.:J^^^< Body not attenuate in 



No conical 

 [ pendage. 



ap- 



' (Esophageal 

 teeth present. 



No oesophageal 

 teeth. 



nal teeth. i '"■"• 



V Leaping cirri 



front 



I ( Body attenuate in front 



I Internal teeth -/Body not attenuate in 





No cirri . 



\ front 



j Body never much flattened 



'( Body much flattened 



A bundle of cirri, simulating a foot 



A row of spherical vesicles, each enclosing a very 



refractive body 



No lateral (A branched intestine... 



lamina. 1 No branched intestine . 



A broad marginal lamina of compact 



tissue 



No vesicles 



e b 



teryn 

 Phialina. 

 Trachelophyllum . 

 Enchelys. 



Holophrya, 



TJrotricha. 



Enchelyodon. 



Prorodon. 

 Nas»ula. 

 Chilodon. 

 Trichopvs. 



Lojrodes. 



Trackelius. 



Ampkiieptus. 



LoxophyllMin. 



TRACHE'LirS, Ehrenb.— A geniLs of 

 Holotrichous Infusoria, fani. Tract elina. 



Char. Mouth situated at the base of the 

 trunk-like prolongation, alimentary canal 

 apparently branched. No row of spherical 

 yesicles or lateral lamina. 



T. ovum (AmiihUei^tus omim, Duj.), in 

 bog-water. Trachelius himella (PI. 32. fig. 5) 

 is a Lo.xophyllmn. (Clap. & Lachm. Inf. 

 345.) 



TEACIIELOCER'CA, Ehr.— A genus 

 of Holotrichous Infusoria =Zof7'?/w«r2rt. 



2'. olor=^Laa'ymaria olor. 



T. m'ridis (PI. 31. fig. 33). Body green; 

 neck as in the last; freshw. ; length 1-120". 



BrBL. Ehr. lif. 341 ; Clap. & Lachm. 

 Inf. 295; Kent, Inf. 514. 



'TRACHELOM'ONAS, Ehr.— A genus 

 of Infusoria, family Ci-yptomonadina. 



Char. Body enclosed in a spherical or 

 ovoid hard and brittle envelope, having a 

 small aperture, from which a long flagelli- 

 form filament projects ; eye-spot present. 

 Freshwater. 



T. vokocina (PL 30. fig. 24 d, empty en- 

 velope). Spherical, green, brownish, or red; 

 eye-spot red; length 1-8G5". 



T. niyricans. Ovate-globose, green, black- 

 ish brown or reddish ; eye-spot brownish ; 

 length 1-1780". 



T. cylindrica. Oblong-subcylindrical ; 

 bright green ; eye-spot red ; length 1-1000". 



Other species. 



The bodies represented in PI. 30. fig. 24 

 (h tor/), and which are commonly found in 

 bog-water, probably belong here, with the 

 genera Chcetoyhnaici), Chcetotyjyhla (tig. 26), 

 and Doxocoeciis (fig. 47). The margins of 

 the red envelope appear as a bright red 

 ring, on account of the greater thickness 



traversed by the light. They are probably 

 spores of Algse. 



BiBL. Ehrenberg, Inf. 47 ; Kent, Inf. 388. 



TRACHELOPHYL'LUM, Clap. &Lach. 

 — A genus of Trachelina (Holotrichous In- 

 fusoria). 



Char. Anteiior part of the body with a 

 prolonged appendage, which has no circlet 

 of cirri ; body flat, without a lateral marginal 

 lobe. Swims without turning on its axis. 

 Two species ; freshwater. (Clap. & Lachm. 

 Inf 3U6.) 



TRACHYL'IA, Fr.— A genus of Micro- 

 lichen.s, parasitic on Pertusarice. 



Char. Thallus granular ; apothecia cu- 

 puliform, sessile, black. Spores blackish, 

 1-septate. Three species, on old posts. 

 (Lindsay, Qu. Mic. Jn. 1869, 140 : Leighton, 

 Lich. Fl 470 



TRACH'YTE. See Rocks. 



TRADESCAN'TIA, L.— A genus of 

 Commelyuacese (Monocotyledons), com- 

 monly cultivated in gardens under the name 

 of Spider-worts. These plants are cele- 

 brated for having served as material for 

 some of the most remarkable observations 

 on the physiological processes of vegetables 

 — as the Rotation of the cell-contents, 

 and the multiplication of the cells, so well 

 seen in the hairs of the stamens when young 

 (PI. 47. figs. 8 & 9). The stems, petioles, 

 vvc. afi'ord beautiful spiral, annular, and re- 

 ticulated vessels, kc. 



TRAG'AOANTH.— A gum derived from 

 various .-species of Adrayalns, not con.^isting 

 of a formless exudation, but of partty dis- 

 organized collenchymatous tissue which is 

 extruded from the medullary raj's. It is 

 often used for fastening opaque objects, as, 

 when dry, its surface is duU, unlike gum- 



