UROGLAUCINE. 



[ 665 ] 



USNEA. 



with the synonym (erroneous ?) of Chloro- 

 coccum murale, Grev. 



The mode of reproduction is unknown. 



BIBL. Hassall, Brit. Mar. Alg. p. 322. 

 pi. 80 ; A. Braun, Verjungung, &c. ( Ray Soc. 

 Vol. 1853, p. 178). 



UROGLAUCINE. This substance, 

 which was first detected by Heller, may be 

 obtained by evaporating human urine with 

 concentrated nitric acid (PI. 9. 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 f. phys. Chemie 

 und Mikrosk. ; Lehmann, Physiolog. Chem. ; 

 Funke, Atlas, &c. 



UROGLENA, Ehr. A supposed genus 

 of Volvocinese (Confervoid Algre), consisting 

 of a family of zoospore-like individuals ar- 

 ranged at the periphery of a membranous 

 sphere, as in Volvox, but said to differ from 

 that genus in having only one cilium, and 

 also a basal prolongation or tail running 

 toward the centre of the sphere. U. Volvox 

 is described as a sphere, 1-95" in diameter, 

 with yellowish corpuscles 1-1728" long, ex- 

 clusive of the tail, which is three or four 

 times as long. Inhabiting bog-pools. We 

 very much doubt whether it is distinct from 

 VOLVOX. 



BIBL. Ehrenb. In/us, p. 61. 



UROLEPTUS, Ehr. A genus of Infu- 

 soria, of the family Colpodea. 



Char. Eye-spot absent ; no tongue-like 

 process, nor proboscis ; a tail present. 



U. piscis (PL 25. fig. 15 a) = Oxytricha 

 caudata, Duj. Body terete, subturbinate, 

 gradually narrowed behind into a tail ; 

 internal granules green. Aquatic; length 

 1-288 to 1-144". 



U. lamella (PI. 25. fig. 15 b). Body de- 

 pressed, hyaline, linear-lanceolate, flat and 

 very slender. Aquatic ; length 1-216". 



Three other species. 



BIBL. Ehrenberg, Infus. 358. 



UROMYCES, Lk. A genus of Uredinei 

 (Coniomycetous Fungi), perhaps not pro- 

 perly separated from Puccinia, but distin- 

 guished from the ordinary state of that 

 genus by the unilocular spores of the perfect 

 fruit (see UREDINEI and PUCCINIA). The 

 Uromycetes are rusts occurring upon leaves, 

 presenting at least two forms of fructifica- 

 tion (spermogonia have not yet been ob- 

 served), viz. 1. Uredo-fruits, consisting of 

 stylospores unaccompanied by paraphyses, 

 which have been described as species of Tri- 



chobasis, Lev., and, 2. the perfect fruit, 

 resembling that of PUCCINIA, but with uni- 

 locular spores, unaccompanied by paraphyses. 

 Ur. Ficaria, Lev. (Uredo Ficariee, Alb. and 

 Schw.) is not uncommon on Ranunculaceae, 

 U. appendiculatus, Lk. (Uredo appendicu- 

 losa, Berk.) on various Leguminosse. 



BIBL. Berk. Brit. Flor. ii. pt. 2. pp. 380, 

 382; Tulasne, Ann. des Sc. nat. ser. 4. ii. 

 pp. 145 & 185; Leveille, ibid. ser. 3. viii. 

 p. 370 ; De Bary, Brandpilze, p. 33. 



URONEMA, Duj. A genus of Infusoria, 

 of the family Enchelia. 



Char. Body elongate, narrowed in front, 

 slightly curved, surrounded with radiating 

 cilia, and with a long straight cilium behind. 



U. marina (PI. 25. fig. 16). Body colour- 

 less, semitransparent, nodular, and with four 

 or five faint longitudinal ribs. Marine; 

 length 1-570". 



BIBL. Dujardin, Infus. 392. 



UROPODA, 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 (PL 2. fig. 25). Sixth joint 

 of legs longest. The peduncle forms a horny 

 filament, secreted from 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. d. Sc. nat. ser. 2. ii. 

 29 ; Gervais, Walckenaer's Arachniden, iii. 

 220. 



UROSTYLA, Ehr. A genus of Infu- 

 soria, of the family Oxytricha. 



Char. Body ciliated ; styles present, but 

 no hooks. 



On the under surface of the posterior part 

 of the body is a small cleft with styles. 



U. grandis (PL 25. fig. 17). Semicylin- 

 drical, subclavate, rounded at the ends, an- 

 terior portion slightly thickened. Aquatic ; 

 length 1-144 to 1-96". 



BIBL. Ehrenberg, Infus. 369. 



URTICA, L. The botanical name of the 

 genus to which the stinging-nettle belongs 

 (see STINGS). The plants yielding the fibre 

 of Chinese grass-cloth, and Puya, are placed 

 by some authors under Urtica, by others 

 under BOEHMERIA. 



USNEA, Ach. A genus of Parmeliaceae 

 (Gymnocarpous Lichens), with a somewhat 

 crustaceous branched thallus, bearing peltate 



