ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 535 



Grubcr poiuts out that eveu Maupas' researches owe their impulse to 

 the precedence of hypotheses. 



Gruber notes two cases, one observed by Jickeli, the other by him- 

 self, where the micronucleus of a Paramsecium appeared to be absent, 

 but where the symptoms of senile degeneration were not exhibited. 

 According to Gruber the macroinicleus consists of " histogenetic " 

 plasma, the micronucleus of germ-j)lasma. 



Finally, Gruber refers to his recent exjjeriments on Actinoi^lirys sol. 

 The marine form, with few vacuoles, soon acquires them in fresh water, 

 which soaks in much more abundantly. The reverse experiment was 

 also made. The marine Amceba crystalligcra also became ricbly vacuo- 

 lated in fresh water. None of the environmental variations, however, 

 wer^ more than transitory, that is to say, they disapj^eared when the 

 original conditions were restored. 



Two New Infusorians.* — M. Fabre-Domerguc describes a new 

 species of Colpoda, which he calls G. Henneguyi, which was found in an 

 old maceration of leaves and dried detritus collected in the garden of 

 the College de France. Its slow movements and its large size would 

 make it comparatively easy to study, were its protoplasm not obscured 

 by fine and numerous granulations. It differs in form from G. cucullas, 

 and normal individuals vary from 0*31 to 0*65 mm. in length. After 

 describing the details of its appearance, the author states that it gives 

 rise to division-cysts and to lasting cysts ; the former have a very 

 delicate membrane, and the contents divide into four. The lasting 

 cysts are smaller and more rounded, and have a thick and resisting 

 envelope. 



Pronocfiluca pelagica is the name given to a new genus of flagellate 

 Infusoria found on the surface of the sea at Concarneau. In the form 

 of its mouth, and the presence of two flagella, it approaches Cliilomonas, 

 but, on the other hand, its tentacle is exactly like that of a Noctiluca 

 minus the striation. The author believes that we have here a form 

 which is intermediate between the Flagellata and the Cystoflagellata. 



Anoplophrya aeolosomatis-t — Mr. H. H. Anderson gives a descrip- 

 tion of a new ciliate infusorian parasitic in the alimentary canal of 

 Aeolosoma chlorostictum (Wood- Mason, MSS.). It differs from all 

 members of its genus excei^t A. mytili in possessing a single contrac- 

 tile vesicle, and from it it may be distinguished by the shape and form 

 of its eudoi^last, which is axial, band-shaped, extending nearly the whole 

 length of the body, in most specimens straight, though in a few some- 

 what curved or S-shaped ; this endoplast is coarsely granulated, and in 

 one specimen, five large and highly refractive, though not crystalline, 

 particles of different sizes were seen in it. The surface of the infusorian 

 is densely ciliated, and finely striated in a longitudinal direction. The 

 contractile vacuole is situated centrally above the endoj)last. An inter- 

 esting process of multiplication by transverse fission, was observed to 

 resemble that which takes place in A. nodulata. It was noticed that 

 the individuals in process of division were far larger than those that 

 were not being divided, and that the segments were very much smaller 

 than the parent one. 



* Ami. de Microgr., ii. (1889) pp. 353-7 (1 pi.)- 



t Jouru. Asiat. Soc. Bengal, Ivii. (1889) pp. 381-3 (1 pL). 



