TRIOHODECTES. 



[ 780 ] 



TRICHOGASTRES. 



TRICHODEC'TES, Nitzsch. A genus 

 of Philopteridae (Anoplura). 



Char. Antennae filiform, three-jointed; 

 maxillary palpi none or inconspicuous; 

 mandibles two-toothed ; tarsi with one law. 



T. latus (PI. 35. fig. 6). Abdomen pale 

 fulvous ; head and thorax ferruginous yel- 

 low; head subquadrate, with two black spots 

 in front, and a black lateral band on each 

 side ;' abdomen oval. 



Common upon dogs, especially puppies. 



Other species, upon cattle, the horse, ass, 

 deer, sheep, cat, &c. 



BIBL. Denny, Anoplur. 186; Murray, 

 EC. Ent. 383 ; M^gnin, Paras. 80. 



TRICHODER'MA, Pers. A genus of 

 Fungi, placed by Fries among the Gastero- 

 mycetes. The plants are characterized by 

 a roundish peridium composed of inter- 

 woven, ramified, septate filaments, evanes- 

 cent at the summit; the spores minute, 

 heaped together, at first conglobated. T. 

 viride, growing on fallen trees, has a white 

 villous peridium, and dusky-green globose 

 spores. The peridia appear as scattered 

 spots 1-20 to 1-8" or more in diameter. It 

 is a conidiiferous state of Hypocrea rufa. 



BIBL. Berk. Br. Fl ii. pt. 2. 323 ; Gre- 

 ville, Crypt. Fl. pi. 271 ; Fries, Sum. Veg. 417. 



TRICHODES'MIUM,Ehrenb. A genus 

 of microscopic Algae, apparently belonging 

 to the Nostochaceae, discovered by Ehren- 

 berg to produce the red colour over large 

 tracts in the Red Sea, and found also in the 

 Atlantic and Pacific Oceans by Darwin and 

 Hinds, and in the Chinese Sea. No vesi- 

 cular cells or spermatic cells have been de- 

 tected; hence the characters are as yet 

 imperfect. Montagne has separated the 

 plant of Hinds from Ehrenberg's ; and Kiit- 

 zing characterizes two species in his Sp. 

 Algarum, and figures them in his Tabuke 

 Phycologicce ; but neither the figures nor the 

 descriptions indicate any very marked diffe- 

 rences. 



T. Ehrenbergii, Montagne. Blood-red (at 

 length becoming green) ; bundles widish, 

 confluent ; filaments 1-3000" in diameter, 

 joints about twice as wide as long. Found 

 floating in vast strata in the Red Sea by 

 Ehrenberg and Dupont, and in the Yellow 

 Sea (China). 



T. Hindsii. Blood-red, with a strong 

 odour; bundles longish, slender; joints 

 twice or thrice as broad as long, transversely 

 granulated. 



See also on the species, and on the red 

 coloration of the sea by plants, Montague's 



papers in the Ann. So. Nat. 3. ii. 332, 

 vi. 262 ; 4. i. 81 ; Ann. N. H. 2. xix. 431 ; 

 Rabenht. Alg. \\. 161. 



TRICHODI'NA, Ehr. A genus of Peri- 

 trichous Infusoria, family Vorticellina. 



Char. No tail, nor pedicle; cilia absent 

 from the surface of the conical or discoidal 

 body, but forming a frontal crown or a tuft ; 

 oral orifice not spiral. 



T. pediculus ( Urceolaria stellina, D.) (PI. 

 81. fig. 16). Body discoidal, the under and 

 upper surfaces each with a crown of cilia. 



Parasitic upon Hydra vulgaris and viridis. 

 Breadth 1-575 to 1-200". On the under 

 surface is an annular undulatory membrane ; 

 and within and at the base of this is a horny 

 ring, with an outer and an inner row of teeth, 

 forming an organ of adhesion. 



T. mitra. Parasitic upon Planaria torva. 



T. grandinella and T. vorax, on Halterina. 



T. tentaculata. Body discoidal, cilia large, 

 forming a tuft; a styliform, tentacle-like 

 process present ; diam. 1-290". 



BIBL. Ehrenberg, Inf. 265; Dujardin, 

 Inf. 527; Siebold, Siebold und Kolliker's 

 Zeitschr. ii. 361 5 Stein, Inf. 174; Claparede 

 Lachmann, Inf. 128 ; Kent, Inf. 647. 



TRICHODINOP'SIS, Cl. and Lachm. 

 A genus of Heterotrichous Infusoria. Free, 

 conical ; an anterior oral ring of cilia, and 

 a posterior suctorial disk. T. paradoxa, in 

 the mucous cavities of Cyclostoma. (Clap. 

 & Lachm. Inf. 133 ; Kent, Inf. 614.) 



TRICHODIS'CUS, Ehr. A genus of 

 Rhizopoda, family Actinophryina, D. 



Char. Body depressed, stalkless ; seta- 

 ceous tentacles forming a simple row at the 

 margin of the body, 



T. sol (PI. 32. fig. 8). Body suborbicular, 

 hyaline or yellowish, tentacles variable; 

 diameter 1-432 to 1-216". 



BIBL. Ehr. Inf. 304. 



TRICHOGAS'TER, Sterki. A genus of 

 Hypotrichous Infusoria. Free, ovate, ven- 

 tral surface ciliated, a few larger cilia in 

 front and behind. T. pilosus, freshwater. 

 (Sterki, Zeits. wiss. Zool. 1878 : Kent. Inf. 

 764.) 



TRICHOGAS 'TRES {Puff-balls} .A fa- 

 mily of Gasteromycetous Fungi, character- 

 ized by the contents of the leathery peridium 

 breaking up when mature into a pulverulent 

 mass of spores and filaments, without a 

 central column, the whole being expelled by 

 the bursting of the case (see GASTEROMY- 

 CETES). 



BIBL. Berkley, Ann. N. H. iv. 155 ; Tu- 

 lasne, Ann. Sc. N t 2. xvii. 1, 



