CH^TOMORPHA. 



[ 130 ] 



CH.ETOTYPHLA. 



CHiETOMORPHA, Kutz.=CoNFERVA 

 spec. 



CH.ETONOTUS, Elir.— A genus of mi- 

 croscopic aquatic animals, placed by Ehren- 

 berg among the Rotatoria (Rotifera), and by 

 Dujardin with the Infusoria. 



Ehrenberg places it in the family Ichthy- 

 dina (which see). Dujardin gives the follow- 

 ing characters : 



Body oblong, convex, and furnished with 

 hairs or scales above; flat and provided with 

 very minute vibratile cilia beneath ; termi- 

 nated in front by a rounded margin, near 

 which is a distinct mouth ; posteriorly bi- 

 furcate or terminated by two caudiform pro- 

 cesses. 



The three or fom* species are found in 

 fresh water, amongst aquatic plants. Their 

 structure requires further investigation. 



Chcetonotus larus (PI. 24. fig. 24). Length 

 1-710 to 1-220". 



Dujardin appends Ichthydium, Ehr. to this 

 genus. 



BiBL. Ehr. Infus. p. 389; Duj. Infus. 

 p. 568. 



CHtETOPIIORA, Schrank.— a genus of 

 Ch8etophorace8e(ConfervoidAlgse),character- 

 ized lilieDraparnaldiahy setigerous branched 

 filaments, but difi'ering from the latter by 

 the filaments being imbedded in a gelatinous 

 matrix. The Ch(Btoj)hor(B are found in 

 fresh water, forming little green protuber- 

 ances on stones, sticks, &c., usually bright 

 green. The zoospores are formed singly in 

 the joints, and bear four cilia. The account 

 of the fructification given by Miiller {Flora, 

 1842. p. 513) seems to relate to Coleocheete. 



The membrane of the filaments is very 

 delicate, and the zoospores appear some- 

 times to escape by its solution. Br. species : 



1. C endivicefoUa, Ag. Hassall, Br. Fr. 

 Alg. pi. 9. figs. 1, 2; Kiitz. Tab. Pliyc. iii. 

 pi. 21 . fig. 3, Ulva incrassata, Eng. Bot. 967. 

 Common in streams. 



2. C. tuberculosa, Hook. Hass. /. c. pi. 9. 

 7, 8; Kiitz. I. c. pi. 19 and 21. Rivularia 

 tuberculosa, Eng. Bot. 2366. Boggy pools. 



3. C. elegans, Ag. Hass. I. c. pi. 9, 3, 4 ; 

 Kiitz. I. c. pi. 20. Stagnant pools; com- 

 mon. 



4. C. pisiformis, Ag. Hass. I. c. pi. 9. 5, 

 6 ; Greville, Crypt, t. 150 ; Kiitz., I. c. pi. 18; 

 Thuret, Ann. des Sc. nat. 3 ser. xiv. pi. 19. 

 fig. 1-3. Subalpine lakes. 



5. C. dilatata, Hass. I. c. pi. 13. fig. 2. 



6. C. longava, Carm. A doubtful species. 

 Hook. Br. Flora, vol. ii. pt. 1. 



BiBL. As above. 



CHJ]:TOPHORACEiE.— AfamilyofCon- 



fervoid Algae, growing in sea or fresh water, 

 invested wdth gelatine ; either filiform or (a 

 number of filaments being connected toge- 

 ther) expanded into gelatinous, branched, 

 definitely-formed or shapeless fronds or 

 masses. Filaments jointed, furnished with 

 bristle-hke processes. Fructification con- 

 sisting of spores and four-ciliated zoospores, 

 formed out of the contents of the articula- 

 tions. 



Synopsis of British Genera. 



1. Draparnaldia. Filaments free, gelati- 

 nous, the primary nearly colourless, bearing 

 tufts of coloured ramuli at the joints ; zoo- 

 spores formed singly in the joints of the ra- 

 muli. 



2. Chcetophora. Filaments aggregated 

 into shapeless, incrusting or branched gelati- 

 nous fronds, the joints bearing bristle-like 

 branches ; zoospores solitary in the articula- 

 tions ; the membranes of the filaments very 

 fugacious. 



3. Bulbochcete. Filaments free, each joint 

 truncate at the apex, and bearing there either 

 an articulate deciduous bristle bulbous at the 

 base, or a sessile inflated cell crowned by a 

 bristle. Zoospores and spores formed in the 

 inflated cells or in the bulbs of the bristles. 



4. Coleochcete. Frond disk-shaped or ir- 

 regularly expanded, adherent to leaves, &c. 

 of aquatic plants under water, formed of 

 jointed dichotomous filaments radiating from 

 a centre, more or less conjoined laterally ; 

 the joints producing from the back a trun- 

 cate open sheath, from which a long bristle 

 is exserted. Fructification : spores and zoo- 

 spores formed in the joints. 



5. Ochlochcete. Frond discoid, appressed; 

 filaments cylindrical, radiating from a centre, 

 irregularly branched, consisting of a single 

 series of cells, each of which is commonly 

 prolonged above into an inarticulate bristle. 



Foreign genus. See Aphanoch^te, 

 Kiitz. 



BiBL. See the genera. 

 CH.ETOPSIS, Greville=DEMATiuM. 

 CHtETOSTROMA, Corda. See Volu- 



m p» T T A 



CHiETOTYPHLA, Ehr.— A genus of In- 

 fusoria, of the family Peridinaja. 



Char. Carapace (siliceous?) hispid or co- 

 vered with rigid hairs ; no transverse furrow, 

 no eye-spot. 



C. armata (PI. 23. fig. 26 : a, side-view, 

 b, posterior end view). Ovato-subglobose, 

 rounded at each end, hispid, with short setae, 



