124 PROCEEDINGS OF SOCIETIES, 



the bright spect at one end, they had thus a great and curioua 

 resemblance to some Bacterian forms. 



Cosmarium fontigenum, Nordst. — Mr. Archer showed examples 

 of the only Cosmorium he could find in the stuff labelled Cos- 

 marium fontigenum in Nordstedt's and Wittrock's " Algse exsie- 

 catse" — this, if it be the form had in view by Nordstedt, is a 

 very common one in this country and in Scotland, but it hardly 

 agrees with the figure accompanying the material. That under 

 view is somewhat like Cosmarium bioculatum, but differs in its 

 truncate top, and in possessing a slight depression just beneath 

 the obscure upper angles, thus causing the ends to appear as if 

 somewhat produced. If this be Nordstedt's C. fontigenum, it 

 would be the first time that author would have so far exaggerated 

 the characteristics of any of the many species brought forward by 

 him as to render the least doubt of the identity, for they are 

 always most truthful and charmingly accurate in all details. It 

 is possible, however, the true form may have yet to be en- 

 countered. 



Triceratium frohlematic, shown. — Eev. E. O'Meara exhibited 

 a form of Triceratium found by him in Mr. Moseley's collection 

 at Kerguelan's Laud, but only one example of which was met 

 with, and that not quite perfect. It was very large, and the 

 areolatiou distinct ; he could not as yet identify it with any form 

 of this genus as yet described. 



I*ithophora Kewensis, State of, exhibited. — Dr. E. Perceval 

 Wright exhibited a series of mounted specimens of Fitho- 

 phora Keicensis, and some living specimens, for which he 

 was indebted to the goodness of Sir Joseph Hooker, C.B. 

 This species, described by Dr. Wittrock from specimens found 

 in the Tropical Aquarium at Kew, was in general appearance 

 somewhat like a Cladophora. But it was remarkable to fiud in 

 the specimens exljibited, which seemed to represent the winter 

 stage of the plant, aliiost the same brauchle.*s, tortuous, and 

 irregularly knobbed filaments as he had shown at the May 

 meeting in Flumosa. The resemblance was, of course, only a 

 very general one, for in the one plant we had an unicellular, in the 

 other a multi-cellu'ar algal form ; still this stage of Pithophora 

 was well worthy of beiug very attentively studied. 



