650 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



divided into four sections: the Heterotricha, among which. Balanti- 

 diopsis is a new genus for Balantidium duodeni Stein, the Oligotricha, 

 the Hypotricha, the Peritricha. The author's views as to the phylogeny 

 of the subclass Ciliata are shown in the accompanying table : — 



/ Op alirdna . 



PERITR.H\TOTR.OLIGOTR.Stentorina / "2/ 



Bursar . PLa^iotomuia 



Isotridnina 

 LOTR.. 



Urocentrina 



ECINA (Aspirolricha) 



The author next proceeds to discuss certain physiological-biological 

 points, commencing with the phenomena of regeneration ; those of move- 

 ment are next considered, and then the processes of digestion. The 

 interesting chapter on modes of life contains a list of parasitic forms 

 arranged under the heads of their respective hosts, from which Birds 

 and Eeptiles are absent. The influences of temperature, of chemical 

 substances and of electricity are described. The part before us con- 

 cludes with an account of the parasites of the Ciliata. 



Parasitic Trichodina.* — Herr J. Carriere describes a species of 

 Trichodina (? pediculus) which is found living in the lateral canal or 

 wall as on other parts of the body of Cottus gohio and eating blood and 

 lymph-corpuscles. In bony fishes there appears to be normally a 

 constant and often very well marked migration of lymph-cells into the 



* Arch. f. Mikr. Anat., xxxiii. (1889) pp. 402-15 (1 pi). 



