TRICHOMONAS. 



[ 653 ] 



TRICHOSPORANGE. 



menophyllaceous Ferns, of elegant and deli- 

 cate habit. 



Fig. 76S. 



Fig, 768. A sporange, with horizontal annulus. Mag- 

 nified 100 diameters. 



TRICHOMONAS, Duj.— A genus of In- 

 fusoria, of the family Monadina. 



Char. Body ovoid or globular, becoming 

 drawn out when adherent to the slide, hence 

 sometimes exhibiting a tail-like prolonga- 

 tion; an anterior flagelliform filament present, 

 with a group or row of vibratile cilia. 



T. vaginalis (Pi. 25. fig. 9). Body glu- 

 tinous, nodular, unequal, frequently becoming 

 agglutinated to other objects ; movement va- 

 cillating. Length 1-2500". Found in morbid 

 vaginal mucus. 



T. limacis (PI. 25. fig. 10). Body ovoid, 

 smooth, pointed at each end; movement 

 forwards, by revolution upon its axis. Length 

 1-1 GOO", Found in the intestine of Limax 

 agrestis. 



BiBL. Dujardin, Infus. 299. 



TRICHOPTERIS, Presl.— A genus of 

 Cyathseous Ferns. Exotic. 



'TRICHORMUS {Anabaina, Bory, Bre- 

 bisson, Kiitzing. Montague, &c.). — A genus 

 of Nostochaceae (Confervoid Algae), growing 

 on wet earth, or rising to the surface of 

 lakes, brackish ditches, &c., forming an in- 

 determinate stratum, at first nearly colour- 

 less and transparent, with the filaments spa- 

 ringly scattered through the mass ; the fila- 

 ments afterwards increasing rapidly in 

 number, causing the mass to become opake, 

 deep bluish-green, and occasionally mottled 

 with brown,especially beneath. The filaments 

 are mostly short, moniliform, and frequently 

 as much curved as in Nostoc. The cells are 

 more or less globular, and the spermatic 

 cells resemble the ordinary cells more in this 

 than in the allied genera. The filaments 

 closely resemble those of Nostoc, and some 

 of the floating aquatic species can only be 

 distinguished from that genus by the absence 

 of definite form or size, and of the hardened 

 periderm. It diff'ers from Dolichospermum 

 in the globular shape of its sporangia, and 

 from SplicBrozyga and Cylindrospermum in 

 the arrangement of its vesicular and sper- 

 matic cells, which are here always separated 

 by ordinary cells. Mr. Ralfs enumerates 

 five British species. In PI. 4. fig. 2, we 



have represented what appears to be a new 

 species. 



1. T. jios-aqu(B (Lyngbye). Filaments 

 flexuose or curved, moniliform ; cells orbi- 

 cular, vesicular ones larger, terminal and 

 interstitial. Ralfs, Ann. Nat. Hist. ser. 2. 

 vol. V. pi. 8. fig. 2. Anabaina flos-aquce, 

 Kiitzing, Spec. Algarum ; TricJwrmus incur- 

 vatus, Allman, Ann. Nat. Hist. xi. 163. 

 t. 5 (1843); Hassall, Brit. Freshw. Algce, 

 t. IS. fig. 1. Rising to the surface of stag- 

 nant pools or other still waters in gelatinous 

 masses of considerable size, generally of a 

 rich bluish-green colour. 



2. T. (?) spiralis (Thompson). Filaments 

 coiled or spiral ; ordinary cells subquadrate 

 or orbicular; vesicular and spermatic cells 

 orbicular. — Ralfs, I. c. pi. 8. fig. 3. (?) Ana- 

 baina spiralis, Thompson, Ann. Nat. Hist. 

 vol. V. 81 ; Spirillum Thompsoni, Hassall, 

 Br. Fr. Algae, t. Ixxv. /• (See Spirulina.) 



3. T. Thwaitesii (Harvey). Filaments 

 moniliform, slightly flexuose ; ordinary cells 

 globular or nearly so ; vesicular cells larger, 

 globular when interstitial, ovate when ter- 

 minal, ciliated; sporangia oval, catenate. — 

 Ralfs, I. c. pi. 8. fig. 4. Sphcerozyga 

 Thwaitesii, Harvey, Phyc. Britannica, t. 

 113B. Salt-marshes, forming thin, gelati" 

 nous, dark green patches, either on damp 

 soil, covered at spring-tides, or at the bottom 

 of brackish ditches or pools, afterwards 

 floating in large gelatinous masses, and then 

 abounding in spermatic cells. 



4. T. oscillarioides (Bory). Filaments 

 elongated, flexuose; ordinary joints sub- 

 quadrate, distinct ; vesicular cells barrel- 

 shaped or elliptic, naked; spermatic cells 

 oval, catenate. — Ralfs, /. c. pi. 8. fig. 5. 

 Anabaina oscillarioides, Bory, Diet. d'Hist. 

 natur. ; Sphcerozyga oscillarioides, Kiitzing, 

 Tabulee PhycologioB, pi. 96. fig. 5. In 

 brackish ditches, bluish-green. 



5. T. rec^MS (Thwaites). Filaments bright 

 green, straight, short, slightly tapering to- 

 wards the extremities; ordinary cells sub- 

 spherical, rather shorter than wide; vesicular 

 cells oblong, smocrth, scarcely wider than 

 the ordinary cells, and never terminating the 

 filament ; spermatic cells spherical or oblong, 

 numerous. — Ralfs, /. c. pi. 8. fig. 6. Pools 

 (near Bristol, Thwaites); of a beautiful green 

 colour. 



BiBL. The works cited above. 



TRICHOSPORANGE.— A term used by 

 Thuret in application to multiseptate fila- 

 ments, occurring in some of the Fucoid 

 Algae, producing ciliated zoospores in their 



