CYCLOTRICHA. 



[ 226 ] 



CYLINDROTHECA. 



E.). Valves convex ; striae broad, reaching 

 neither the centre nor the margin ; fr. wat. ; j 

 diam. 1-760". 



Kiitzing characterizes three marine spe- 

 cies, with the valves free from striae, and 

 seventeen doubtful specie?, marine and fos- 

 sil, belonging to the genera Actinocyclus, 

 Discoplea, and Hyalodiscm of Ehrenberg. 

 Rabenhorst describes 9 species. 



BIBL. Kiitzing, Syn. Diat. BacilL 50, and 

 Sp. Alg. 18; Ehrenberg, Berl. Ber., In/us., 

 and Mflerog.; Smith, Brit. Diat. 27; 

 Thwaites, Ann. N. H. 1848, i. 169. 



CYCLOT'RICHA, Kent. A genus of 

 Holotrichous Infusoria. 



C.citreaOphryoglena ritreum, 01. & 

 Lachm. 



CY'CLOUM, Hass. A genus of Infun- 

 dibulate Ctenostomatous Polyzoa. 



Char. Zoary fleshy, incrusting, covered 

 with imperforate papillae ; ova in clusters. 



C. papillosum. Tentacles 18 ; on Fucus 

 serratus : referred to Alcyonidium. 



BIBL. Hassall, Ann. N. H. 1841, vii. 

 p. 483; Gosse, Mar. Zool. ii. 19 (fig.); 

 Hincks, Polijz. 493. 



CYLINDROCYS'TIS. See Cocco- 



CHLORIS. 



CYLINDRCE'CID^E. A family of 

 Ctenostomatous Polyzoa. 



Gen. : Cylindrcecium and AnguineUa. 



CYLINDRCE'CIUM, Hincks. A genus 

 of Cylindrcecidae, Ctenostomatous Polyzoa. 



Char. Cells elongate, cylindrical, arising 

 from a creeping stolon; no gizzard. 3 

 species, marine, on rocks, sea-weeds, &c. 



BIBL. Hincks, Poliiz. 535. 



CYLINDROLEBE'RIS, Brady. A ge- 

 nus of Ostracode Entomostraca, fam. Cypri- 

 dinidae. 



2 recent British species : C. tnaria and 

 C. tereS) both marine. 



BIBL. Brady, Linn. Trans, xxvi. p. 464. 



C YLINDROPS YL'LUS, Brady. A ge- 

 nus of Cppepodotis Entomostraca. C. Icevis, 

 in dredgings. 



BIBL. Bradv, Copep. (Ray Soc.), iii. 30. 



CYLINDRbSPER'MUM,Kiitzing(^a- 

 baina, Bory and others). A genus of 

 Nostochaceae (Conferyoid Algae), with the 

 filaments less radiating than in the allied 

 Sphcerozyga ; distinguished under the mi- 

 croscope by the resemblance of the filaments 

 to an annulose animal ; the ordinary cells 

 looking like a long jointed body, the large 

 elliptic sporangial cell like a thorax, and the 

 terminal vesicular cell often bearing fine 

 hairs, like a head. British species : 



C. catenatum, Ralfs (PL 8. fig. 4). Fila- 

 ments monilif orm ; ordinary cells orbicular ; 

 vesicular cells oval ; sporanges oval, cate- 

 nate. (Ralfs, Ann. N. H. 1850, vol. v. pi. 9. 

 fig. 14.) Forming a bluish stratum, con- 

 taining very delicate, elongated, straight or 

 slightly flexuose, generally parallel filaments. 



The remaining British species are not de- 

 scribed by Ralfs ; but the following are 

 noticed as British by Kiitzing. 



C. macrospermum, Kiitz. Filaments 

 thick, equal ; ordinary cells oblong, l-700th 

 of a line in diameter; sporanges oblong, 

 turgid, firm, fuscous, 1-100 to 1-60'" long, 

 1-300 to 1-200'" thick. Kiitzing, Sp. Alg. 

 293 ; Tab. Phyc. vol. i. pi. 98. fig. 4. Ana- 

 baina impalpebralis, Hassall, Alga, pi. 76. 

 fig. 3. Standing water; forming an aeru- 

 ginous green stratum. 



C. mesoleptum, Kiitzing. Filaments 

 densely entangled, unequal, 1-800 to 1-850'" 

 thick; sporanges oblong, 1-180 to 1-150'" 

 long, 1-350 to 1-300'" broad, slightly con- 

 stricted in the middle. Kiitzing, Sp. Alg. ; 

 Tab. Phyc. vol. i. pi. 98. fig. 5. Anabaina 

 constricta, Hassall, Algce^ pi. 75. fig. 9. 

 ^Eruginous green ; in brackish marshes. 



Excluded species of Kiitzing : C. elon- 

 gatum = Sphcerozyga elastica, Ag. (Ralfs) ; 

 C. kptospermum = Sphcerozyga leptosperma 

 (Ralfs) ; C. Carmichaelii=-Sph(erozyga Car- 

 michaelii (Harvey) ; C. Ralfsn=l)olicho- 

 spermum Ralfsii (Ralfs) ; C. HassaUii= Co- 

 niophytum Thompsoni (Hassall). 



Rabenhorst describes 13 European species. 



BIBL. Ralfs on Nostochineee, Ann. N. If. 

 1850, vol. v. 321 ; Kiitzing, Sp. Alg. ; Ra- 

 benhorst, Fl. Alg. ii. 186. 



CYLINDROS'PORUM, Grev. A sup- 

 posed genus of parasitic Fungi, stated by 

 Tulasne to consist of the conidiiferous forms 

 of Sphaeriacei. 



C. concentricum, Grev. = Uredo cylindro- 

 spora, Hook. Br. Fl., grows upon the leaves 

 of cabbages. It appears however, that 

 Greville's plant is really a species of Glcco- 

 sporium, and quite different from the fungi 

 with which it has been confounded. 



BIBL. Grev. Sc. Crypt. Fl.t.xxix.; Berke- 

 ley, Hort. Tr. iii. 265 ; Tulasne, Ann. Sc. 

 Nat. 4 ser. v. 109 ; Berkeley, Outl 325. 



CYLINDROTHE'CA, Rab. A genus 

 of Diatomaceae. 



Char. Frustules fusiform, free, ends acute ; 

 with 2 (rarely 1 or 3) longitudinal flexuous 

 costee ; no nodules. 



C. Gerstenbergeri (PI. 51. fig. 34). Living 

 frustules cylindrical, obtusely attenuate at 



