88 CONFERVACE^. 



diameter, with occasionally a pair of swollen longer cells among the short ones. 

 (Tab. XLVI. A.) 



Hab. Key West, W. H. H., Mr. Binney. Boca di Rio Bravo, Dr. Schott. (v. v.) 



Forming decumbent strata, covering rocks, or entangled with other Algas. Filaments 

 slender, variously curved and twisted, of a membranaceous, rather rigid substance, 

 destitute of gloss, and not adhering to paper when drying, cylindrical. The articula- 

 tions appear to be normally about as long as broad, but as they divide in the middle by 

 transverse cell division, they are frequently found less than half their proper length. 

 Here and there, throughout the filament, a pair of cells occur longer than the rest, and 

 swollen, with theendochromeof each cell collected at the dissepiment: these may be con- 

 nected with reproduction. The endochrome is dispersed in drying, and does not well 

 recover its form on being moistened. 



A much more robust and rigid plant than C. tortuosa. 



Plate XLVI. A. Fig. 1. Ch^tomorpha brachygona, the natural size. Fig. 2. 

 Portion of a filament, magnified. 



9. Ch^tomorpiia tortuosa, Dillw. ; filaments very slender, somewhat rigid, densely 

 interwoven into dark green, crisped, fleecy strata ; articulations twice or thrice as long 

 as broad, filled with endochrome. Billw. Conf. t. 46. E. Bat. t. 2220. Harv. Phyc. 

 Brit. t. 54, ^1. Ag. Syst. p. 98. Kiitz. Sp. Alg. p. 376. (Tab. XLVI. B.) 



Hab. On rocks, &c. about half tide level. Halifax, W. H. H. Coast of Maine, 

 Dr. A. Young. Massachusetts' Bay, Mr. Pike, W. H. H., Sfc. Newbury Port, Mr. 

 Hoofer. Unalaschka, Wosnessensky. (v. v.) 



Strata spreading widely over the surface of rocks, &c. like a coating of dark green 

 wool. The filaments are very slender, about half the diameter of human hair, but they 

 are when recent crisp and rigid, and do not collapse when removed from the water. They 

 are densely interwoven, of a dark green colour, and not without gloss. The articula- 

 tions vary in length in difierent specimens, but are usually twice as long as broad, 

 sometimes more, sometimes less ; and the endochrome generally recovers its form on 

 being remoistened after drying. 



I have received from Dr. Ruprecht, under the name C confervicola, a specimen from 

 Unalashka that I cannot distinguish, under the microscope, from the ordinary C. tortu- 

 osa of the East coast. It grows attached to C. melagoniiim, in which it is peculiar. 

 The " C. tortuosa crassior" of Dr. Ruprecht I have already alluded to under C litorea. 



Plate XLVI. B. Fig. 1, CHiETOMORFiu tortuosa, the natural size. Fig. 2, portion 

 of two filaments, magnified. 



