LEPTOTIIYR1UM. [ 460 ] 



LEUCOPIIRYS. 



LEPTOTIIY'RIUM, Kutz. A genus of 

 Sphaeronemei (Stylosporous Fungi). 



L. jualandis, Lib., L. frag aria, and 

 L. ribis have been found in ' Britain ; they 

 are probably stylosporous forms of Asco- 

 mycetes. 



BIBL. Fries, Sum. Veg. 371, 423; Berke- 

 ley, Ann. N. H. 2 ser. v. 371 ; Tulasne, 

 Ann. Sc. Nat. 4 ser. v. 115. 



LEPTOTRICHA'CE^E. A family of 

 operculate Acrocarpous Mosses, branching 

 by innovations, or with the fertile summits 

 several times divided. Leaves lanceolate 

 or awl-shaped, often canaliculate-concave, 

 with a nerve, mostly flattened or terete ; 

 cells prosenchymatous, often mingled with 

 parenchymatous, lax or firmish, empty, not 

 unfrequently thickened at the apex, then 

 square. Capsule ovate or cylindrical, some- 

 times naked, sometimes erect, often stru- 

 mulose at the base ; operculum conical or 

 subulate. Differing from Dicranaceae in the 

 absence of alar cells to the leaves. Brit, 

 gen.: 



Angstrcemia, BracJiyodus, Campyloste- 

 lium, Leptotrichum, Seligeria. 



LEPTO'TRIOHUM, Hampe . A genus 

 of Acrocarpous operculate Mosses, including 

 certain Didymodonta and Trichostoma of 

 other authors. 



LEPTOTRICHUM, Corda. A genus of 

 Sepedonei (Hyphomycetous Fungi) j not 

 British. 



LEPTUS, Lam. See TROMBIDIUM. 



L. autumnalis (Trombidium autumnale), 

 the harvest-bug. 



LERN^EA. A genus of Pcecilopoda 

 (Crustacea). 



L. branchialiS) on the gills of the cod. 

 (Baird, Br. Entom. 344.) 



LERNEONE'MA, Edwards. A genus 

 of Siphonostoma (Crustacea). 



Char. Body long, slender, narrowed an- 

 teriorly in the form of a neck, terminated 

 by a swollen head, with two or three 

 simple, curved, horn-like appendages ; abdo- 

 men of inconsiderable length, simple ; ovi- 

 ferous tubes long and slender. 



Two British species : L. spratta (PI. 19. 

 fig. 24), length 2 inches ; andZ. encrasicholi. 

 Both found upon the sprat. 



BIBL, Baird, Brit. Entomostraca, 339. 



LESKEA, Hedw. A genus of Mosses. 

 See HYPNUM. 



LEUCINE, or caseous oxide, is a normal 

 constituent of the lungs, spleen, pancreas, 

 the salivary glands, &c., and is produced 

 during the putrefaction of albuminous and 



gelatinous matters. Usually accompanied 

 by tyrosine, it crystallizes in minute spheres, 

 which frequently unite and form radiating 

 clusters, which often present a yellow tin<re 

 and a concentric lamination. It is soluble 

 in water, less so in alcohol. The alkaline 

 pancreatic juice transforms albumen into 

 leucine and tyrosine. It also occurs in the 

 Crustacea, Arachnida, and Insecta. 



BIBL. Frey, Hist. 49; Rindflrisch, 

 Path. Hist. 14 ; Voit, KoU. $ Sieb. Zeitsch. 

 ii. 1868. 



LEUCO'BRYUM, Hampe. A genus of 

 Bryaceae, Acrocarpous Mosses,but exhibiting 

 also lateral fruit-stalls. Capsule, lid, and 

 peristome as in Dicranum ; out the leaves 

 whitish, spongy, and composed of two 

 layers of cellular tissue, the nerve indistinct. 



L. ylaucum. On moist heaths, woods, 

 &c. 



BIBL. Wilson, Bryol. Br. 82. 



LEU'COCYTES. These are the colour- 

 less corpuscles of the blood, lymph, &c. 



LEU'CODON, Schw03gr. A genus of 

 Pleurocarpous Mosses. 



Char. Capsules oval, erect, pedicel short, 

 calyptra large ; outer teeth 16, bifid or 

 perforated, not hygroscopic : shoots simple ; 

 leaves plicato-striate, nerveless. 



L. sciuroides, trunks of trees and walls, 

 frequent ; L. Layurus. rare. (Wilson, Bryol. 

 Br. 313.) 



LEU'COPHRYS, Ehr. A genus of the 

 family Bursarina (Ciliated Infusoria.) 



CJtar. No sheath ; body truncated in front 

 obliquely ; buccal cirri surrounding the 

 truncation ; anus at the posterior extremity ; 

 no watch-glass organ ; no rows of cilia in 

 the interior of the buccal fossa. 



Ehrenberg describes eight species ; they 

 are found in salt and fresh water, both sweet 

 and putrescent. 



L. patida (PI. 31. fig. 38, a dorsal, b ven- 

 tral surface). Body ovato-campanulate, 

 hyaline or white, turgid ; mouth large, pa- 

 tulous. Freshwater and marine. Length 

 1-288 to 1-96". The alimentary canal, 

 with the sacculi, according to Ehrenberg's 

 view, is represented in fig. 31 a. 



L. spathula (Spathidium hyalimim, D.) 

 (PI. 31. figs. 75, 76). Body lanceolate, 

 compressed, whitish, membranous, obliquely 

 truncated and dilated in front ; freshwater. 

 Length 1-144". Dujardin denies the exist- 

 ence of the anterior row of cilia. A very 

 doubtful form. 



PI. 31. fig. 37 represents L. tfriala, D., 

 which is one of the Opalina. 



