TETRAPEDIA. 



[ 763 ] 



TEXTULAIUA. 



Char. Palpi incumbent upon the rostrum, 

 stout, short, and conical; mandibles and 

 labium as in Ithajihignathus ; palpi chelate; 

 coxa- inserted in two groups on each side, 

 one for the two anterior, the other for the 

 two posterior; anterior legs longest, third 

 joint (femur) largest ; claws short and 

 greatly curved, and with rigid bulb-pointed 

 hairs. 



Several species and varieties, red and 

 green. 



T. telarius, the red spider. Yellowish ; 

 abdomen produced behind ; a dark yellow 

 spot on each side of the back. On ill- 

 conditioned greenhouse-plants, forming a 

 web. 



T. glaber (PL 6. fig. 32). Very minute ; 

 eyes two, whitish, upon the anterior pro- 

 minence. Under stones in damp places. 



T. lupidum (<.ritatu8, Duges) (PI. 6. 

 fig. 35). Legs slender, anterior very long ; 

 eyes three on each side ; several rows of 

 white points upon the back and margins of 

 the body. Under stones and upon plants. 



Claparede places Trombidium autumnale 

 in this genus. 



BIBL. Duges, Ann. Sc. N. 2. i. 24, & ii. 

 V> : ( iervais, Walckenaer's Apteres, ii. 165 ; 

 Dufour, Ann. Sc. N. i. xxv. 279 ; Koch, 

 Deutschl. Cntstac. ; Boisduval, Ent. Hort. 

 88 ; Murray, EC. Ent. 97. 



TETRAPE'DIA, Reinsch. A genus of 

 Unicellular Algse. 



Char. Cells compressed, quadrangular or 

 triangular, equilateral, becoming subdivided 

 into quadrate or connate segments or 

 rounded lobes, either by deep vertical or 

 oblique markings, or by wide angular or 

 rounded sinuses. (Archer, Qu. Mic. Jn. 

 1872, 351.) 



TETRAP'LOA, Berk, and Br. A genus 

 of Torulacei (Coniomycetous Fungi), com- 

 prising at present a single species, T. aris- 

 tata, a curious little fungus growing upon 

 leaves of grass. See TORULACEI. 



TETRAP'LODON, Br. and Sch. A ge- 

 nus of SplachnaceaB (Acrocarpous operculate 

 Mosses). T. mnioides and angustatus, on 

 dung in mountainous regions. 



TETRASEL'MIS, Stein. A genus of 

 Flagellate Infusoria. Free, obovate or 

 oblong; flagella four; protoplasm green, 

 with an eye-spot. T. cordiformis, fresh- 

 water. (Kent, Inf. 315.) 



TETRAS'PORA, Link. A gen us of Pal- 

 mellace8e(Confervoid Algae), nearly related 

 to the Ulvacese; indeed it is very difficult 

 to draw any very distinct line of demarcation 



between Tetraspora and Monostroma, the 

 fronds of both of which are membranous 

 strata formed of a single layer of cells ; the 

 latter, however, has its constituent cells 

 crowded, while in Tetraspora the green cell- 

 contents lie scattered, mostly in groups of 

 two or four, in the gelatinous frond. Thuret 

 states that the cells possess long cilia in the 

 stage when they are imbedded in a contin- 

 uous frond (PI. 7. fig. 10). Development 

 by the ciliated cell-contents breaking out as 

 swarming zoospores. Two recorded British 

 species appear to be distinct, growing in 

 stagnant pools. 



T. gelatinosa (PL 7. fig. 10). Frond gela- 

 tinous, soft, of irregular shape and division, 

 pale green; cells 1-10800 to .1-4200" in 

 diameter (Kiitzing, Tab. Phyc. i. p. 28). 



T. lubrica. Frond green, elongated, me- 

 sentery-shaped, lobed and sinuated, lobes 

 often anastomosing; cells angulo-globose, 

 1-3600" in diameter (Kiitzing, /. c. pi. 30). 

 BIBL. Hassall, Alg. 300, pi. 78 ; Kiitzing, 

 Sp. Alg. 225; Tab. Phyc. i. ; Thuret, Ann. 

 Sc. N. 3. xiv. 248, pi. 21 ; Nageli, Einzell. 

 Alg. 71, pi. 2 ; Rabenht. Alg. iii. 38. 

 TETRASPORES. See SPORES. 

 TETRATAXTS, Ehr. A Valvuline 

 Foraminifer, with four chambers in a whorl. 

 Fossil ( Carboniferous). (Parker and Jones. 

 Ann. N. H. 4. x. 259.) 



TEXTILE FABRICS. The components 

 of these are noticed under the heads of silk, 

 wool, fibrous and filamentous structures. 



BIBL. Wiesner, Techn. Mikr.-, Schle- 

 singer, Mikr. Untersuch. d. Gespinntfasern, 

 1872; Button, M. M. Jn. vii. 259; Lat- 

 teaux, Man. Techn. Micr. 



TEXTULA'RIA, Def ranee (TEXTILARIA, 

 Ehr.). A protean genus of hyaline Fora- 

 minifera, having typically a binary series of 

 subglobular or subquadrate chambers ar- 

 ranged alternately on two sides of a longi- 

 tudinal axis, and usually increasing in size 

 from the oldest (at apex) to the youngest, 

 with a slit -like apperture in the wall of 

 each chamber ( T. cuneiformis, PL 23. fig. 47). 

 The shell is flattened in one direction in 

 Vulvulina, with oblique chambers and ter- 

 minal slit, V. gramen (PL 23. fig. 49) ; in 

 another, in Cuneolina, with transverse cham- 

 bers and a row of apertural pores in normal 

 position. Irregularly alternate and biserial 

 chambers, passing into a short linear row, 

 with a necked and rimmed aperture, consti- 

 tute Heterostomella ; Bigenerina has many 

 uniserial chambers, with a terminal pouting 

 mouth (B. agglutinans, PL 23. fig. 50). 



