TRICHOCEPHALUS. 



[ 651 ] 



TRICHODESMIUM. 



TRICHOCEPHALUS, Goeze.— A genus 

 of Entozoa, of the order Ccelelmintha^ and 

 family Nematoidea. 



Char. Body elongate, composed of two 

 parts, the anterior longer and capillary ; the 

 posterior becoming suddenly broader; spi- 

 culum of male simple, long, and surrounded 

 by a sheath. 



The (ten) species occur in the large intes- 

 tine., principally the caecum of man and the 

 mammalia. 



T. dispar (PI. 16. fig. 19, the male; fig. 

 21, the female, in which the narrowed por- 

 tion is too short). 



Anterior portion of the body spiral in the 

 male, containing the oesophagus only, or the 

 first moniliform portion of the intestine; 

 posterior portion containing the rest of the 

 intestine and the reproductive organs. Anus 

 situated at the posterior obtuse end of the 

 body. Integument transversely striated, 

 and with a longitudinal band studded with 

 papillae (PL 16. fig. 20). Oviduct termi- 

 nating at the point of junction of the two 

 portions of the body ; ova (fig. 21a) oblong, 

 covered by a resistent shell, with a short 

 neck at each end. 



BiBL. J)\\]?ivdm, Hehninthes, 30 \ Owen, 

 Todd's Cycl. Anat. 8f Phys., art. Entozoa; 

 Wedl, Pathol. Histolog. 787. 



TRICHOCOLEA, Nees. — A genus of 

 Jungermanniae(Hepaticace8e),containingone 

 British species, T. [Jung.) tomentella, grow- 

 ing in moist places in the w^est and north of 

 England, Scotland, and Ireland. It is re- 

 markable for the character of the leaves, 

 which are cut up into com]iOund capillary 

 segments, giving the plant a spongy texture. 

 Colour pale. 



BiBL. Hook. Brit. Flor. ii. pt. 1. p. 127, 

 Brit. Jung. pi. 36 ; Eckart, Synops. Jung. 

 pi. 6. fig. 49 ; Endlicher, Gen. Plant. Supp. 

 1. No. 472, 15. 



' TRICHODA, Miill., Ehr.— A genus of 

 Infusoria, of the familv Enchelia. 



Char. Body free from hairs or cilia ; teeth 

 absent ; mouth obliquely truncated, ciliated, 

 with a lip, but neck absent. 



The six species are colourless. 



T. pura. Body oblong, clavate, attenuate 

 in front. Aquatic; length 1-720''. A spe- 

 cies of Dujardin's genus Acomia. 



The other species have been very imper- 

 fectly examined and illustrated. 



Dujardin's genus, which is placed in the 

 family Trichodina, D., differs entirely from 

 that of Ehrenberg. The characters are : — 

 Body ovoid-oblong or pyriform, slightly 



flexible in front, with a row of cilia directed 

 backwards, and appearing to indicate the 

 presence of a mouth. 



T. angulata (PL 25. fig. 7). Body oblong, 

 obliquely and irregularly folded or angular, 

 frequently with one or more superficial va- 

 cuoles. Aquatic; length 1-900". 



T. pyrum, D. = Leucophrys carnium, E. 



BiBL. Ehrenberg, Infus. 306 ; Dujardin, 

 Infus. 395. 



TRICHODACTYLUS, Dufour.— A genus 

 of Arachnida, of the order Acarina, and fa- 

 mily Acarea. 



Char. Rostrum short, with minute setae ; 

 fourth pair of legs shorter than the rest, 

 without claws, and terminated by a very 

 long seta. 



T. osmi(B. Glabrous, with two marginal 

 setae on each side ; pale red ; legs and pos- 

 terior part of the bodv darker. Length 

 1-50". 



Found upon the thorax of an Osmia (a 

 kind of mason-bee). 



BiBL. Dufour, Ann. desSc.nat. 2 ser. xi. 

 2'JQ ; Gervais, WalcTcenaer's Apteres, iii. 266. 



TRICHODECTES, Nitzsch.— A genus of 

 Anoplurous Insects, of the family Philopte- 

 ridae. 



Char. Antennae filiform, three-jointed; 

 maxillary palpi none or inconspicuous ; 

 mandibles two-toothed ; tarsi with one claw. 



Ten species, parasitic upon quadrupeds, 

 viz. the dog, cat, fox, weasel and stoat, ox, 

 horse, sheep, the red and the fallow^ deer. 



T. latus (PL 28. 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. 



BiBL. Dennv, Anoplur. Monograph. 186. 



TRICHODERMA, Pers.— A genus of 

 Fungi placed by Fries among the Onygenei 

 (Ascomycetes), but apparently of doubtful 

 place. The plants are characterized by a 

 roundish peridium composed of interwoven, 

 ramified septate filaments, evanescent 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 peri- 

 dia appear as scattered spots 1-20 to 1-8" or 

 more in diameter. 



BiBL. Berk. Brit. Flor. ii. pt. 2. p. 323; 

 Greville, Sc. Crypt. Fl. pi. 271; Fries, Summa 

 F<?^. p. 417. 



TRICHODESMIUM, Ehrenb.— A genus 

 of microscopic Algae, apparently belonging 



