COVERS. 



[ 213 ] 



CRIBRAKIA. 



from the various textile fibres consisting of 

 liber structures. From the abseuce of the 

 regular thiekouiug layers, the cells of the 

 cottoD-hairs bect)me collapsed when dry, 

 appearing like a flat baud 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 iiBuous 

 STRUCxniES ; and Mitchell, Qu. Mic. Jn. 

 18G4, 218. 



COVERS. See Ixtroduction, p. xxiv. 



CRASPEDODISCUS, E.— A genus of 

 fossil Diatomaceoe. 



C. coscinodisciiSy '£,.-= Pyxidiciila coscino- 

 discm, 'E.= Coscinodiscus 2)i/xidicula, Kg. 

 (PI. 18. fig. 21). 



C. eleyans, E. = Coscinodiscus craspedodis- 

 cm, Ko-. (PI. 25. figs. 7 & 8). 



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

 2r,6; Kiitzing, Sp. Alq. 126 ; Greville, Mic. 

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



CRASPEDO'PORUS, Grev'.— A genus 

 of Diatomaceae. 



Char. Frustules free, di>k-shaped ; valves 

 with club-shaped rays, each with an ocellus 

 near the margin. 



C Half's ianus. Valves areolar, rays 8; 

 diam. 1-220". Barbadoes. 



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

 Barbadoes. 



BiBL. Greville, Mic. Trans. 18G3, 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- Fig. 145. 



cent gelatinous 

 mycelium, gTow- 

 ing over moss 

 leaves, bark, c&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 Afractubolus. 



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

 Sowerby, Func/i, t. 239 (C. minutum, as 

 Cijathuti minutu&). 



CRATEROSPER'MUM, Braun.— A ge- 

 nus of Zyg-nemacese, with the green endo- 

 chrome not in spiral bands. Conjugating 



Craterium pyriforme. 

 Magnified 10 diameters. 



filaments geniculate ; sporange or zygospore 

 with a double cyst ; the inner spherical, the 

 outer thick, shortly cylindrical, subf^uad- 

 rate, with an annular furrow, and ex- 

 cavated at each pole. 



6'. laievirens (PI. 3. fig. 10). In pools. 



BiBL. Braun, Alg. tlnicell. 1855, 60; 

 Rabeuhorst, 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 (PI. 11. fig. 22) be- 

 longing to the oblique-rhombic prismatic 

 system. 



CREATINIXE or KREATINIXE.— 

 Occurs in the lU'ine 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 crvstallized cnmpiiund 

 with chloride of zinc (PI. 11. fig. 24). This 

 is very difficultly soluble in water, and not 

 at all in alcohol or ether. 



CRE'NOTIIRIX, Cohn. 



-A genus 



of 



Oscillatoriacefe (Confervoid Algfie). 



CJiar. 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. Macrngonidia 

 of the entire or 2-4-divided ceU-contents. 

 Intermediate between Lynyhya and Cha- 

 incpsiphon. 



C. polyspora. In wells and springs. 



BiBL. Cohn, Beit. Biol. i. 108. 



CRESS WEL'LIA, Grev.— A genus of 

 fossil Biatomaceae. 



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. Clvde. Other species. 



BiBL. Greville, Edin. Ph. Tr. 1857, xxi. 

 5.S8; Mic. Tr. 1801, 68; 1865, 4; 1806, 

 78. 



CRIBRA'RIA, Schrad.— A genus of 

 Myxomycetes (Gasteromycetous Fungi), 

 consisting of minute stalked capsules grow- 

 ing upon rotten wood kc. The capsules 

 (peridia) are mem1)ranous ; the upper part 

 falls or decays oft' when the spores are 

 mature ; and the anastomosing filam n ts 



