CERVINIA. 



[ 155 ] 



CILETOGLENA. 



ternal coat of connective tissue, with scat- 

 tered, somewhat spindle-shaped nuclei, and 

 very fine nuclear fibres ; a layer of smooth, 

 longitudinal, muscular fibres, consisting of 

 short fibre-cells with elongated nuclei ; and 

 an inner single layer of epithelium, com- 

 posed of polygonal cells, from 1-1800 to 

 1-1100" in diameter, with roundish nuclei. 

 These cells contain round or irregularly- 

 shaped yellowish-brown, granules, of very 

 various sizes, as also globules of oil. The 

 duct has a coat of connective tissue, and an 

 epithelial coat, consisting of several layers 

 of small nucleated cells, not containing fat 

 or pigment-granules. 



CERVIN'IA, Norman. A genus of 

 marine Copepodous Entomostraca. 

 C. Bradyi. Oban. 



BIBL. Brady, Copepoda (Ray Soc.), i. 85. 

 CESTODISCUS, Grev. Frustules disk- 

 shaped, circular or oval ; valves with radia- 

 ting granules, and a submarginal circle of ob- 

 tuse nrocesses unconnected by special radia- 

 ting lines of dots with the centre. 4 species. 

 BIBL. Greville, Mic. Trans. 1865, 48 j 

 1806, 123. 



CE'TERACH, Willd. A genus of Ferns, 

 usually arranged with the ASPLENIE.S:, 

 although there is only a rudimentary indu- 

 sium, the place of this being supplied by 

 scales. C. officinarum (Asplenium Cete- 

 racli), the native species, occurs chiefly in 

 limestone districts. 



OETOCHTLUS. A genus of Entomos- 

 traca (Crustacea), belonging to the order 

 Copepopa, and family Cetochilidee. 



Distinguished by the two small styliform 

 appendages to the head ; the two-branched 

 inferior antenna, the branches nearly equal ; 

 the unbranched jaw-feet; the six-jointed 

 thorax, and four-jointed abdomen; and the 

 last pair of legs being formed like the rest. 

 Marine. C.septentrionalis] bright red; forms 

 part of the food of the whale and various 

 fishes; length 1-10". 



BIBL. Baird,.Z?n'f..E'n0m0*.p.233; Grob- 

 ben, Clauses Arb. 1880, 243, iii. (Jn. Mic. 

 Soc. 1881, i. 734). 



CETRA'RIA, Ach. A genus of Lichens 

 tribe CetrarieL 



Char. Thallus bright brown, rigid, erect 

 or ascending, divided into lacinise, with 

 shining cortical layer. Apothecia dull or 

 "bright brown. Spermatia cylindrical. 



3 British sp. : C. islandica,"ihe well-known 

 Iceland Moss ; C. Delisei ; and C. aculeata. 

 BIBL. Nylander, Syn. 298; Leighton 

 Lichen-Flora, 1879, 91. 



CETRARIE'I. A tribe of Lichens ; 

 family Lichenacei. 



Char. Thallus compressed, fruticulose, or 

 membranously dilated ; apothecia marginal j 

 spores 8, small, colourless, simple. 

 Genera : Cetraria and Platysma. 

 CEUTHOS'PORA, Fr. A genus of Me- 

 lancouiei (Stylosporous Fungi) closely re- 

 lated to Phoma, one common species of 

 which (C. phacidioides) grows on holly- 

 leaves ; another occurs on the Cherry-laurel 

 (C. Lauri). It is probable that these are 

 only forms belonging to some Ascomycetous 

 genus. 



C. phacidioides, Grev. 3-5 cells in the 

 stroma, splitting into 3-5 plain short teeth. 

 C. Lauri, Sow. Unilocular, splitting into 

 3-4 acute teeth. 



BIBL. Berk. Hook, Br. Fl ii. pt. 2. p. 283 j 

 Grev. Crypt. Fl. pis. 253, 254. 



CELETO'CEROS, Ehr. A genus of Dia- 

 tomaceas. 



Char. Frustules concatenate; valves equal, 

 subcylindrical, with two processes, one on. 

 each side, which, in the young state, are 

 very short and tubular, forming very long 

 horns as the frustules become older ; horns 

 subsequently converted into very long, thin 

 and interwoven siliceous filaments. Marine 

 and fossil. 



Somewhat allied to Biddulphia. Raben- 

 horst admits 18 species. C. didymus (PI. 50. 

 fig. 47). Some British. 



BIBL. Ehrenb. Ber. d. Berl. Ak. 1844, 

 198; Kiitzing, Sp. Aly. 138; Brightwell, 

 Micr. Jn. vi. 155 ; Lauder, Mic. Tr. 1864, 

 75 ; Rabenhorst, Fl. Alg. i. 321. 



CILETOCOC'CUS, Ktz. A doubtful 

 genus of Algse. 



Char. Filaments rigid, short, spiniform, 

 arising from a cellular substratum. 



C. violaceus, radiate, green, becoming 

 violet on drying, on Rhizoclonium ; C. hyali- 

 nus, on Cladophora. 



BIBL. Rabenhorst, Flor. Alg. ii. 199. 

 CH^ETODIS'CUS, Grev. A genus of 

 DiatomaceaB. 



Char. Frustules disk-shaped; valves cir- 

 cular or oval, with radiating dots and a 

 submarginal circle of obtuse processes un- 

 connected by means of special radiating 

 lines of dots with the centre. 

 4 speciee. 



BIBL. Greville, Mic. Tr. 1865, p. 48; 

 1866, p. 123. 



CH^ETOGLE'NA, Ehr. A genus of In- 

 fusoria, of the family Peridinsea. 



CJiar. Carapace hispid, or studded with 



