COVERS. 



C 213 ] 



CRIBRARIA. 



from the various textile fibres consisting of 

 liber structures. From the absence of the 

 regular thickening layers, the cells of the 

 cotton-hairs become collapsed when dry, 

 appearing like a flat band with thickened 

 borders, while liber-cells of all kinds re- 

 main cylindrical, and taper to a point at 

 each end (PI. 28. fig. 1). See FIBROUS 

 STRUCTURES ; and Mitchell, Qu. Mic. Jn. 

 1864, 218. 



COVERS. See INTRODUCTION, p. xxiv. 



CRASPEDODISCUS, E. A genus of 

 fossil Diatomaceae. 



C. Coscinodiscus, J&.za PyxicKeuIa Coscino- 

 discus, E. = Coscinodiscus pyxidicula, Kg. 

 (PL 18. fig. 21). 



C. elegans, E. = Coscinodiscus craspedodis- 

 cus, Kg. (PL 25. figs. 7 & 8). 



BIBL. Ehr. Ber. d. Berl Ak. 1844, 261- 

 266 ; Kiitzing, Sp. Alg. 126 ; Greville, Mic. 

 Trans. 1866, 79; Pritchard, Inf. 831, 939. 



CRASPEDO'PORUS, Grev. A genus 

 of Diatomacese. 



Char. Frustules free, disk-shaped ; valves 

 with club-shaped rays, each with an ocellus 

 near the margin. 



C. Ralfsianus. Valves areolar, rays 8; 

 diam. 1-220". Barbadoes. 



C. Johnstonianus. Rays 5 ; diam. 1-400". 

 Barbadoes. 



BIBL. Greville, Mic. Trans. 1863, 68. 



CRATERIUM, Trent. A genus of 

 Myxomycetes, consisting of minute yellow 

 or brown cup-like bodies, of papery con- 

 sistence, closed by a deciduous operculum 

 (fig. 145); arising 

 from an evanes- 

 cent gelatinous 

 mycelium, grow- 

 ing over moss, 

 leaves, bark, &c. 

 Most of the spe- 

 cies are common. 

 The black spores 

 contained within 

 these cups are 

 intermixed with crowded, obscurely arti- 

 culated filaments (destitute of spiral "fibres), 

 which do not anastomose, and are at length 

 erect. Five British species. A. Murray's 

 remark upon Craterium, that it is an 

 Acarus, applies to Atractobolus. 



BIBL. Hook. Brit. Fl v. pt. 2. 316; 

 Sowerby, Fungi, t. 239 (C. minutum, as 

 Cyaihus minutus). 



CRATEROSPER'MUM, Braun. A ge- 

 nus of Zygnemacese, with the green endo- 

 chrome not in spiral bands. Conjugating 



Fig. 145. 



Craterium pyriforme. 

 Magnified 10 diameters. 



filaments geniculate ; sporange or zygospore 

 with a double cyst ; the inner spherical, the 

 outer thick, shortly cylindrical, subquad- 

 rate, with an annular furrow, and ex- 

 cavated at each pole. 



C. Icetemrem (PL 3. fig. 10). In pools. 



BIBL. Braun, Alg. Unicell. 1855, 60; 

 Rabenhorst, Fl Alg. iii. 258 (fig.). 



CREATINE or KREATINE. Occurs 

 in the juice of the flesh of Mammals, Birds, 

 Amphibia, and Fishes ; in exudations, in the 

 amniotic liquid, the blood, and the brain. 

 It crystallizes from an aqueous solution, in 

 transparent, highly refractive, oblique-rhom- 

 bic prisms and needles (PL 11. fig. 22) be- 

 longing to the oblique-rhombic prismatic 

 system. 



CREATININE or KREATININE. 

 Occurs in the urine of man and of Mam- 

 malia. The crystals form colourless prisms 

 belonging to the oblique -rhombic prismati 

 system (PL 11. fig. 23). 



Creatinine forms a crystallized compound 

 with chloride of zinc (PL 1 1. fig. 24) . Thi s 

 is verv difficultly soluble in water, and not 

 at all in alcohol or ether. 



CRE'NOTHRIX, Cohn. A genus of 

 Oscillatoriaceae (Confervoid Al^ae). 



Char. Filaments narrow, jointed, ar- 

 cuate or twisted into little free or ad- 

 herent tufts ; with hyaline sheaths ; endo- 

 chrome homogeneous ; sporanges terminal. 

 Microgonidia formed from a row of cells by 

 successive division, rounded, very minute, 

 crowded, and without cilia. Macrogonidia 

 of the entire or 2-4-divided ceU"Contents. 

 Intermediate between Lyngbya and C/<- 

 mfssiphon. 



C. polyspora. In wells and springs. 



BIBL. Cohn, Beit. Biol. i. 108. 



CRESS WEL'LIA, Grev. A genus of 

 fossil DiatomaeesB. 



Char. Frustules cylindrical, cohering by 

 short filiform (spine-like) processes into a 

 continuous filament. Valves cup-like, are- 

 olar, destitute of siliceous connecting band 

 or hoop. 



C. turris. Clyde. Other species. 



BIBL. Greville, Win. Ph. Tr. 1857, xxi. 

 538; Mic. Tr. 1861, 68; 1865, 4; 1866, 

 78. 



CRIBRA'RIA, Schrad. A genus of 

 Myxomycetes (Gasteromycetous Fungi), 

 consisting of minute stalked capsules grow- 

 ing upon rotten wood &c. The capsules 

 (peridia) are membranous; the upper part 

 falls or decays off when the spores are 

 mature j and the anastomosing filam n ts 



