TJROCYSTIS. 



[ 796 ] 



TJRQTRICHA. 



BIBL. Hassall, Mar. Alg. 322, pi. 80; 

 Braun, Verjungung (Ray Soc. 1853, 178) ; 

 Rabenht. Alg. iii. 31. 



UROCYS T1S. See POLYCYSTIS. 



UROGLAUCINE. This substance, 

 which was first detected by Heller, may be 

 obtained by evaporating human urine with 

 concentrated nitric acid (PL 13. fig. 20). Its 

 true nature is unknown ; but it is probably a 

 product of the decomposition of the colour- 

 ing-matter of the urine; it has perhaps 

 some relation with indigo. 



BIBL. Heller, Archiv phys. Chemie und 

 Mikr. ; Lehmann, Phys. Chem. ; Funke, 

 Atlas. 



UROGLE'NA, Ehr. A supposed genus 

 of Volvocineae (Oonfervoid Algae), consist- 

 ing of a family of zoospore-like individuals 

 arranged at the periphery of a membranous 

 sphere, as in Volvox, but said to differ from 

 that genus in having only one cilium, and 

 a basal prolongation or tail running toward 

 the centre of the sphere. U. volvox forms a 

 sphere, 1-95" in diameter, with yellowish 

 bodies 1-1728" long, two lateral colour- 

 bands, exclusive of the tail, which is three 

 or four times as long. Inhabiting bog-pools. 

 Kent places it among the Flagellate In- 

 fusoria. (Ehr. Inf. 61: Kent, Inf. 414.) 



UROLEPTUS, Ehr. A genus of Hypo- 

 trichous Infusoria, family Colpodina ; fresh- 

 water. 



Char. Eye-spot absent; no tongue-like 

 process or proboscis ; a tail present. 



U. piscis (PI. 32. fig. 15 ) = Oxytricha 

 caudata, Duj. Body terete, subturbinate, 

 gradually narrowed behind into a tail ; in- 

 ternal granules green; length 1-288 to 

 1-144". 



U. lamella (PI. 32. fig. 166). Body de- 

 pressed, hyaline, linear-lanceolate, flat and 

 very slender ; length 1-216". Other species. 

 (Ehrenberg, Inf. 358 ; Kent, Inf. 779.) 



UROM'YCES, Lk. A supposed genus 

 of Uredinei (Coniomycetous Fungi), perhaps 

 not properly separated from Puccinia, but 

 distinguished from the ordinary state of that 

 genus by the unilocular spores of the per- 

 fect fruit (see UREDINEI and PUCCINIA). 

 The genus Pileolaria, Cast., does not appear 

 to differ from Uromyces in any essential 

 particular. The Uromycetes are rusts oc- 

 curring upon leaves, presenting at least two 

 forms of fructification (spermogonia have 

 not yet been observed), viz. 1. Uredo-fruits, 

 consisting of stylospores unaccompanied by 

 paraphyses, which have been described as 

 species of Trichobasis, Lev. ; and 2. the per- 



fect fruit, resembling that of PUCCINIA, but 

 with unilocular spores, unaccompanied by 

 paraphyses. U. fcarice. Lev. ( Uredofi- 

 carice, Alb. & Schw.) is not uncommon 

 on Ranunculaceae, U. appendiculatus, Lk. 

 (Uredo appendiculosa, Berk.), on various 

 Leguminosae. 



BIBL. Berk. Br. Fl ii. pt. 2. 380, 382 ; 

 Tulasne, Ann. Sc. Nat. 4. ii. 145 & 185 ; 

 Leveille, ib. 3. viii. 370 ; De Bary, Brand- 

 pike, 33. 



URONE'MA, Duj. -A genus of Holotri- 

 chous Infusoria. 



U. marina (PI. 32. fig. 16). Body colour- 

 less, semitransparent, nodular, and with 

 four or five faint longitudinal ribs ; mouth 

 ventral, with a trap-like velum; marine; 

 length 1-570". 



BIBL. Duj. Inf. 392; Clap. & Lach. Inf. 

 271 ; Kent, Inf. 546. 



URONYCH'IA, Stein. A genus of 

 Hypotrichous Infusoria. Oval-oblong, with 

 a carapace, truncate in front, with a mem- 

 branous upper lip, with posterior hooks ; 

 mouth excavated, with a band-shaped un- 

 dulating membrane. 



U. transfuga=Plcesconia scutum, Duj. 

 Salt water. (Stein, Inf. ; Kent, Inf. 797.) 



UROP'ODA, Latr. A genus of Arach- 

 nida, of the order Acarina and family Ga- 

 masea. 



Char. Palpi and rostrum inferior ; dorsal 

 shield consisting of a single, broad, circular 

 or oval piece ; legs nearly equal ; body fre- 

 quently with a caducous anal peduncle. 



U. vegetans (PI. 6. fig. 25). Sixth joint 

 of legs longest. The peduncle forms a 

 horny filament, secreted rrom the anus, and 

 serving to attach the body to Coleopterous 

 insects, of which this animal is the parasite, 

 although it is sometimes found under 

 stones. Four other species, most of them 

 doubtful. 



BIBL. Duges, Ann. Sc. Nat. 2. ii. 29; 

 Gervais, Walck. Apt. 220. 



UROSTY'LA, Ehr. A genus of Hypo- 

 trichous Infusoria, fam. Oxy trichina. 



Char. Body ciliated ; styles present in a 

 small cleft on the ventral surface ; no hooks. 



U. grandis (PI. 32. fig. 17). Semicylin- 

 drical, subclavate, rounded at the ends, 

 slightly thickened in front; freshwater; 

 length 1-44 to 1-96". (Ehr. Inf. 369; 

 01. & L. Inf. 142 ; Kent, Inf. 797.) 



UROT'RICHA, 01. & Lachm. A genus 

 of Holotrichous Infusoria, family Trache- 

 lina. Free, ovate, with a long posterior 

 saltatory cirrus. 



