50 



C.longata. Vaucheu. Hi/!, des Conf. d'cau douce, p. 71. t. 6. f. 1. 

 A part of the filaments reprefented in T. 3. f. A. belongs to this, and a 

 part to the following fpecies. The fpires are fometimes though rarely, 

 double, but even in this ftate it may be diftinguiihed from C decimlna by 

 its more flender filaments and fomewhat fliorter joints. I have never feen 

 a fpecimen of C. inflata of Englifh Botany, but am led by the defcription 

 and figure to fufpecl that it is not diftincT: from this fpecies. 

 37. fpiralis. C. filis fimplicibus, demum conjugatis, flavo-virentibus; granulis 

 in fpiram unicam compadtam difpofitis j articulis diametro fub-duplo lon- 

 gioribus. T. 3. f. C. and T. C. 



C. porticalh. Vaucher. Hi/1, des Conf. p. 66. t. 5. f. I. (exc. Syn. 



Mulleri.) 

 Since the Introduction was printed, a curious fpecimen of this fpecies 

 has been gathered by Mr. E. Home, at Clapham, and examined by Mr. 

 Woods, who gives the following account of it. " The plant is a pale 

 dirty green nearly without glofs, about the ufual fize of C. fpiralis ; when 

 magnified, the length of the joints is feen to be about equal to their width 

 or a little more, and the fpiral tube is in moft parts nearly obliterated, but 

 the chief Angularity of this plant is in the connecting procefies which are 

 uniformly at the ends, inflead of as ufual in the middle of the joints ; and 

 each of which appears to unite with the procefs of the next joint of the 

 fame filament. No indication of the conjugation of two filaments is to be 

 obferved ; the dark globules appear only where the two joints are thus con- 

 nected, and the adjacent one is uniformly empty. 

 38. bipunHata. C. filis fimplicibus, demum conjugatis, viridi flavefcentibus, 

 lubricis ; articulis bipunctatis, diametro fub-fefqui longioribus. T. 2. 



VAUCHER. 

 Mr. Hooker informs me that he has lately found this fpecies, with the 

 joints feparated like thofe of C. focculofi, and that, when fcparated, the 

 joints became rounded at the corners, and the internal maffes completely 



