CETOCHILUS. 



[ 129 ] 



CH^TOMONAS. 



granules, of very various sizes, as also glo- 

 bules of oil. The duct has a coat of areolar 

 tissue, and an epithelial coat, consisting of 

 several layers of small nucleated cells, not 

 containino; fat or pigment-granules. 



CETOCHILUS.— A genus of Entomo- 

 straca (Crustacea), belonging to the order 

 Copepoda, and family Cetochilidae. 



Char. Head distinguishable from body, 

 but firmly articulated with the first ring of 

 the thorax, and furnished with two small 

 styhform prolongations; eyes 2; superior 

 antennae longer than the bod}^, right only 

 fm-nished in the male with the swollen hinge- 

 joint; inferior antennae composed of two 

 nearly equal branches ; foot-jaw^s three pans, 

 strongly developed, not branched ; thorax of 

 six, abdomen of four segments; legs five 

 pairs, last pair formed in the same manner 

 as the rest. Marine. 1 British species : 



C septentrionalis. Bright red; forms 

 part of the food of the whale and various 

 fishes; length 1-10". 



BiBL. Baird, Brit. Entomos. p. 233. 

 CETRARIA, Ach.— A genus of Parme- 

 liaceae (Gymnocarpous Lichens), chiefly com- 

 posed of northern species, growing upon 

 trunks of trees, rocks, or on the ground in 

 heathy places. C. islandica, ' Iceland moss,' 

 is found sparingly on the ground in exposed 

 places in Scotland. 



BiBL. Hook. Br. Fl. ii. pt. 1. 224; Engl. 

 Botany, pi. 1330. 1036, &c. ; Tulasne, Ann. 

 des Sc. nat. 3 ser. xvii. pi. 10. fig. 1-3. 



CEUTHOSPORA, Fr.— A genus of Me- 

 lanconiei (Coniomycetous 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 ge- 

 nus. 



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

 stroma, sphtting into 3-5 plain short teeth. 



2. C. Lauri, Sow. Unilocular, splitting 

 into 3-4 acute teeth. 



BiBL. Berk. Hook. Br. Fl. ii. pt. 2. 283; 

 Grev. Sc. Crypt. Fl. pi. 253, 254. 



CHJETOCERAS, Ehr.— A genus of Dia- 

 tomaceae. 



Char. Frustules concatenate ; valves equal, 

 turgid, with two apertures (processes?) on 

 each side, which, in the young state, are very 

 short and tubular, the "two frustules being 

 contiguous, forming very long horns as the 

 frustules become remote ; the horns are sub- 

 sequently converted into very long, thin and 

 interwoven siliceous filaments. (The broken- 



ofi^ horns might be regarded as Melosirce.) 

 Marine and fossil. 



Somewhat allied to Biddulphia. 5 spe- 

 cies : C dichceta, tetrachcBta, didymus, ba- 

 cillaria, and diploneis. None British. 



BiBL. Ehrenb. Ber. de Berl. Akad. 1844. 

 p. 198; Kiitzing, Sp. Alg. p. 138. 



CH^TOGLENA, Ehr.— A genus of In- 

 fusoria, of the family Peridinaea. 



Char. Carapace (siliceous?) hispid, or 

 studded with rigid hairs (? spines) ; no trans- 

 verse furrow; an eye-spot present. The 

 organ of motion is a flagelliform filament. 



C. Volvocina (PI. 23. fig. 24 a). Oval, 

 internal substance brownish-green ; eye-spot 

 red; length 1-1100". Aquatic. This ap- 

 pears to be the same as Trachelomonas vol- 

 vocina. See Trachelomonas. 



C. caudata. Oval, hispid, with a short 

 tail ; internal substance green ; eye-spot red; 

 margin of carapace m-ceolate and toothed ; 

 length 1-850"; aquatic. 



BiBL. Ehr. Infas. ; id. Ber. d. Berl. Ak. 

 1840, p. 199; Dujardin, Infus. p. 329. 



CH.ETOMIUxAI, Kunze.— a genus of 

 Perisporacei (Ascom^-cetous Fungi), having a 

 filamentous mycelium bearing superficial, 

 roundish or ovate conceptacles clothed with 

 hairs, finally opening above and containing 

 clavate asci with paraphyses ; spores simple, 

 ovate. Br. species : — 



1. C. elatum, Kimze. Conceptacle sub- 

 ovate, black or bro^n, more or less crusta- 

 ceous ; spores apiculate at each end. Gre- 

 ville, Sc. Crypt. Fl. pi. 230. On mouldering 

 straw, old matting, &c. Very common. 



2. C. chartarum, Ehr. Conceptacles sub- 

 globose, black, surrounded by a bright yel- 

 low spot ; spores roundish. On paper. 



BiBL. Hook. Br. Fl. ii. pt. 2. p. 328; 

 Kunze, Mycolog. Heft i. ; Fries, Syst. My- 

 col. iii. p. 254, 255. 



CH.^TOMONAS, Ehr.— A genus of In- 

 fusoria, of the family Cyclidisia. 



Char. An oral vibratile organ (whether a 

 flagelliform filament or ring of cilia is un- 

 certain) ; movement of animal slow, but 

 leaping effected by means of non-vibratile 

 bristles situated upon the body. 



In putrid animal and vegetable infusions, in 

 dead bodies of other infusoria, Closteria, &c. 



C. globulus (PI. 23. fig. 25 a). Nearly 

 spherical, ash-coloured, setae numerous ; 

 length 1-2700". 



C. constricta (PI. 23. fig. 25 b). Oblong, 

 constricted in the middle, hyaline, setae two; 

 length 1-5400". 



BiBL. Ehr. Jnfus. p. 248. 



