32 QUARTERLY CHRONICLE. 



pyriform shape, about 0'072 mm. in diameter, and whose 

 Avail is composed of polygonal, firmly connected convex rings, 

 or perforated plates. Its surface consequently presents nume- 

 rous dej^ressions. The fenestrce are of various sizes and forms ; 

 most have a rounded or polygonal, more or less regular out- 

 line, but the smallest are large enough to admit conveniently 

 CMamydoraonadce, spores of Alf/a, &c. The stem is many 

 times longer than thick, and it is tubular, the calibre being 

 about 0003 mm. 



Clathndina multiplies itself much in the same way as 

 Actinojjhrys, Sec, viz., by scission, and the production of 

 motile zoospores after having undergone the process of 

 encysting ; of course it is only the soft protoplasmic mass 

 that participates in these processes. In either case the 

 segments of the divided body, or the motile zoosjjores, escape 

 through i\\Q fenestr(e; and either at- once, or after moving 

 about for a short time, become affixed, and, secreting the 

 fenestrated case, become Clatlirulince. 



The systematic relations of this interesting genus are too 

 obvious to require remark, but, as the author observes, it is 

 extremely interesting to find in it an intermediate form of 

 Hhizopoda between Actinophrys and the Radiolaria?, as re- 

 presented, for instance, by Coscinosphcera of Stuart,* which 

 may, in fact, as he says, be described as a cased Actinophrys 

 furnished with pigment-cells. 



4. "On the Origin and Development of Bacterium termo, 

 Duj., Vihreo Vineola, Ehrb," by Job. Liiders, of Kiel. 



5. "Remarks on the above 2)aper^^ by Dr. Hensen. The 

 very interesting observations of Frau Liiders on the develop- 

 ment of Vibriones from the spores and germ -filaments of 

 various of the lower fungi were first communicated in the 

 ' Botanische Zeitung ' (1866, p. oo) ; and her results were 

 commented upon, and strongly controverted, by Professor 

 Hallier in the ' Archiv. f. Mikroskop. Anatomic,' vol. ii. 

 p. 67, 1866. 



The present paper by Frau Liiders is intended to support 

 her previous observations, and to establish her conclusions 

 upon fresh experimental grounds. 



In the second brief communication by Professor Hensel, 

 all that she says is strongly supported ; and there can be no 

 doubt that the subject is one demanding the earnest and 

 zealous attention of microscopists. 



Madame Liiders conceives thatshe has proved that Vibriones 

 (leaving aside the question of there being more than one 



* ' Zeitscb. f. wiss.,' Bd. xvi, Heft, 3. 



