CYCLOTEIOHA. 



[ 226 ] 



CYLINDROTHECA. 



E.). Valves convex ; striae broad, reaching 

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

 diam. 1-7G0". 



Kiitziug characterizes three marine spe- 

 cies, Avith the valves free from striae, and 

 seventeen doubtful species, marine and fos- 

 sil, belonging to the genera Actinocydus, 

 Discoplea, and Hyalodiscus of Ehreuberg. 

 Rabenhorst describes 9 species, 



BiBL. Kiitzing, Syn. Dial. Bacill. 50, and 

 Sj). Aly. 18; Ehrenberg, Bcrl. Ber., Infus., 

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

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



CYCLOT'RICHA, Kent.— A genus of 

 Holotrichous Infusoria. 



C citrea=Ophryoylena citreum, 01. & 

 Lachm. 



CY'CLOUM, Hass.— A genus of Infun- 

 dibulate Ctenostomatous Polyzoa. 



Char. Zoar}' fleshy, iucrusting, covered 

 with imperforate papillfe ; ova in clusters. 



C. impUlosum. Tentacles 18 ; on Fucus 

 serrafns : referred to Alcyonidium. 



BiBL. Hassall, Aym. N. H. 1841, vii. 

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

 Hincks, Polyz. 493. 



CYLINDROCYS'TIS. See Cocco- 



CHLOHIS. 



CYLINDRCE'CID^. — A family of 

 Ctenostomatous Polyzoa. 



Gen. : Cylindroccbim and Anyuixella. 



CYLINt)R(E'CIUM, Hincks.— A genus 

 of Cyhudrrecidee, Ctenostomatous Polyzoa. 



Cliar. Cells elongate, cylindrical, arising 

 from a creeping stolon; no gizzard. 3 

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



BiBL. Hincks, Polyz. 535. 



CYLTNDROLEBE'RIS, Brady.— A ge- 

 nus of Ostracode Entomostraca, fam. Cypri- 

 dinidee. 



2 recent British species : C. marue and 

 C teresj both marine. 



BiBL. Brady, Linn. Trans, xxvi. p. 404. 



CYLINDR'OPSYL'LUS, Brady.— A ge- 

 nus of Copepodous Entomostraca. C. Icevis, 

 in dredgiugs. 



BiBL. Bradv, Copcp. (Bay Soc), iii. 30. 



CYLINDRbSPER'MUxAI,Klitzing(^r2rt- 

 buina, Bory and others). — A genus of 

 Nostochaceae (Confervoid Algae), with the 

 filaments less radiating than in the allied 

 Sphccrozyya ; distinguished under the mi- 

 croscope by the resemblance of the filaments 

 to an aunulose animal ; the ordinary cells 

 looking like a long jointed body, the large 

 elliptic sporangial cell like a thorax, and the 

 terminal ve.:^icular cell often bearing fine 

 hairs, like a head. British species : 



C. catenatum, Ralfs (PI. 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. 



O. macrospermiim, Kiitz. Filaments 

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

 of a line in diameter ; sporanges oblong, 

 tm-gid, fh-m, fuscous, 1-100 to 1-00" ' long, 

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

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

 haina impalpehralis, Hassall, Alyce, pi. 75. 

 fig. 3. Standing water; forming an aeru- 

 ginous green stratum. 



C. mesohptum, 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. Aly. ; 

 Tah. Phyc. vol. i. pi. 98. fig. 5. Anahaina 

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

 ^riiginous green ; in brackish marshes. 



Excluded species of Kiitzing : — C. elon- 

 yatum = Spha'rQzyya eJastica, Ag. (Ralfs); 

 C. leptospermum = Sphcerozyya leptosperma 

 (Ralfs) ; C. Car michaelii= Sphccrozyya Car- 

 michaclii (Harvey) ; C. Balfsii= IJoIicho- 

 spiermiua Balfsii (Ralfs) ; C. HassaUii= Co- 

 niophytum Thompsoni (Hassall). 



Rabenhorst describes 13 European species. 



BiBL, Ralfs on Nostochinece , Ann. N, H. 

 1850, vol. V. 321 ; Kiitzing, Sp. Aly. ; Ra- 

 benhorst, Fl. Ah/, ii. 180. 



CYLINDROS'PORUiAI, Grev.— A sup- 

 posed genus of parasitic Fungi, stated by 

 Tidasne to consist of the conidiiferous forms 

 of Sphaeriacei. 



C. concentricum, Grev. = Uredo cylindro- 

 spora ,\\oo\<.. Br. FL, grows upon the leaves 

 of cabbages. It appears however, that 

 Greville's plant is really a species of Glao- 

 sporinm, and quite different from the fungi 

 with Avhich it has been confounded. 



BiBL. Grev. <S'c. Crypt. Fl.t. xxix.; Berke- 

 ley, Mort. Tr. iii. 2Go; Tulasne, Ann. Sc. 

 Nat. 4 ser. v. 100 ; Berkeley, Oidl. 325. 



CYLINDROTHE'OA, Rab.— A genus 

 of Diatomacoa?. 



Char. Frustules fusiform, free, ends acute ; 

 with 2 (rarely 1 or 3) longitudinal flexuous 

 costae ; no nodules. 



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

 i'ruatules cylindrical, obtusely attenuate at 



