32 QUARTERLY CHRONICLE. 



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

 wall is composed of polygonal, firmly connected convex rings, 

 or perforated plates. Its surface consequently presents nume- 

 rous depressions. The fenestra 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 

 Chlamydomonadce, spores of Algce, ike. The stem is many 

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

 about OOOo mm. 



Clathrulina multiplies itself much in the same way as 

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

 motile zoosiDores after having undergone the process of 

 encysting ; of course it is only the soft protoplasmic mass 

 that participates in these processes. In cither case the 

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

 through the fenestra ', and either at once, or after moving 

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

 fenestrated case, become ClathruJince. 



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 

 Rhizopoda between Actinojihrys and the Radiolariaj, 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. " Oil the Origin and Devetopnient of Bacterium termo, 

 Duj., Vibreo lineola, Ehrb," by Job. Lliders, of Kiel. 



5. " Remarhs on the above paper ^'' by Dr. Hensen. The 

 very interesting observations of Fran 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. 38) ; 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 j)revious 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 that she has proved that Vibriones 

 (leaving aside the question of there being more than one 



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



