TRICIIIA. 



[ 778 ] 



TRICHINA. 



T.favus (PL 17. fig. 29). Valves plane 

 or convex, angles obtuse, with horn-like 

 processes ; areolae hexagonal ; marine ; dia- 

 meter 1-240' '. 



T. alternans. Angles of valves slightly 

 elevated ; areolse circular ; marine. 



T. striolatum (?). Angles subacute ; areo- 

 lation faint ; brackish water. 



BIBL. Ehr. Ber. Berl. Ak. 1840 ; Smith, 

 Br. Diat. i. 26 ; Kiitz. Bacill. 138, and Sp. 

 Alg. 139 ; BrightweU, Micr. Jn. 1858, 153; 

 Rabenht. Alg. 'i. 315. 



TRIO'HIA, Hall. A genus of Myxo- 

 mycetes (Gasteromycetous Fungi) growing 

 upon rotten wood &c., characterized by a 

 stalked or sessile, simple, membranous peri- 

 dium, which bursts at the summit, whence 

 the densely interwoven free capillitium ex- 

 pands elastically, carrying with it the spores. 

 The capillitium is composed of tubular fila- 

 ments (Waters), containing spiral-fibrous 

 secondary deposits, like the elaters of Mar- 

 chantia (PI. 40. fig. 39). In some species 

 the elaters bear numerous little spinulose 

 processes. The genus is divisible into two 

 groups. In the first (Hemiarcyria) the 

 dehiscence of the peridium is obscurely cir- 

 cumscissile (fig. 760), the capillitium dense ; 

 these are always stalked, usually of reddish 

 colour when young. Some species have the 

 peridia fasciculate on a compound peduncle 

 (fig. 760), others separate. In the other 

 division ( Goniospora) the dehiscence of the 

 peridium is irregular, the capillitium lax, 

 the peduncle short or absent, the colour at 



Fig. 760. 



Trichia rubiformis. 

 Magnified 25 diameters. 



first whitish, changing to yellow, and the 

 spores rather angular. In T. serpula and 

 reticulata the sessile peridia are irregular, 

 flexuous, serpentine or annular bodies ; in 

 most of the other species the peridia are 



pyriform, turbinate, or of some analogous 

 form. The elaters (PL 40. figs. 39 & 40) 

 are interesting objects, and form good tests 

 for the defining-power of the microscope 

 under very high powers. They must be 

 mounted in a very thin stratum of liquid. 



BIBL. Berk. Br. Fl. ii. pt. 2. 319 j Ann. 

 N. H. vi. 432, 2. v. 367 ; Fries, Syst. Myc. 

 iii. 182; Sum. Veg. 457; Greville, Crypt. 

 Fl. pis. 266, 281 ; Henfrey, Linn. Tr. xxi. 

 221 ; Currey, Mic. Jn. iii, 15, v. 127. 



TRIC'HINA, Owen. A genus of Ne- 

 matoid Entozoa. 



T. spiralis (PL 21. figs. 16,' 17, 18), as 

 ordinarily seen, inhabits the human body, 

 forming opaque white specks, visible to the 

 naked eye, in the voluntary muscles. The 

 worms usually exist singly within a cyst situ- 

 ated between the muscular bundles (fig. 16). 

 At each end of the cyst is a group of fat- 

 cells resembling those of ordinary fatty tis- 

 sue. The cysts are about 1-50"" in length, 

 elliptical or oval, usually narrowed and 

 slightly produced at the obtuse ends, and 

 consist of numerous structureless laminae, 

 in which are frequently imbedded minute 

 granules consisting of fatty or calcareous 

 matter. The worm is cylindrical, narrowed 

 towards the anterior end, the posterior end 

 being obtuse and rounded. The integument 

 is transversely striated or annular, and ex- 

 hibits an anterior and a posterior longitudi- 

 nal muscular band. The mouth (fig. 17 a) 

 is situated at the anterior extremity, from 

 which a small papilla is sometimes protru- 

 dedl The first part of the alimentary canal 

 is very narrow, and leads to a broader sac- 

 culated portion; this behind the commence- 

 ment of the posterior half of the body ter- 

 minates in a funnel-shaped expansion (fig. 

 18 e), the remainder of the canal being 

 narrow and lined with pavement epithelium 

 (fig. 18 d). The manner in which the pos- 

 terior end of the alimentary canal terminates 

 is doubtful whether directly continuous 

 with the anal orifice, or free in the abdomi- 

 nal cavity. Luschka describes three valves 

 as existing at the posterior end of the body. 

 At the commencement of the funnel-shaped 

 portion of the alimentary canal (fig. 166) 

 are two rounded glandular sacs. The re- 

 productive organs are not well known. 

 Just below the funnel-shaped portion of the 

 alimentary canal is the caecal origin of a 

 tubular sac (figs. 17 & 18 tf), containing a 

 dark granular-looking body (fig. 17 d-, fig. 

 18 e} near its commencement ; this extends 

 to the posterior end of the worm, where it 

 either terminates in the anus or in the 



