I'.34 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Glugea lophii.* — R. Weissenberg discusses the remarkable tumour- 

 like cysts wliicli are produced in the nervous system of tlie angler 

 (Lophias) by the Microsporidian Glugea lophii. The hypertrophy of the 

 ganglion-cells, the retrogressive changes in the cysts, the spreading of 

 the infection within the body, are among the subjects discussed. 



Studies on Flagellates. f— Gr. Senn deals with Oxyrrhis, Nephroselmis, 

 and other Flagellates. He shows that Oxyrrhis belongs to the Peridinidae, 

 and must be placed near Hemidinium. This change is based on the 

 asymmetry of the cell, the possession of a longitudinal and transverse 

 groove, two flagella, the structure of the nucleus, and the mode of 

 division. This removes from the Euflagellata their most divergent 

 member ; and the author seeks to define the Euflagellata more precisely. 

 Longitudinal division is dominant, and there is no form with clearly- 

 defined transverse division. In the symmetry of cell, the nature of the 

 flagella, the structure and division of the nucleus, the Euflagellata are 

 clearly marked off from other Protists. 



Protozoa in the Alimentary Canal of House-fly.:}: — P. C. Flu has 

 found that the gut of Musca domestica in Surinam (Paramaribo) contains 

 two species of Flagellates — Herpetomonas muscse domesticse and Lepto- 

 monas muscse domesticse, and a new Schizogregarine, Octosporea muscse 

 domesticse sp. n. He describes their various stages, and discusses their 

 transmission from fly to fly. 



Cnidosporidian without Cnidoblasts.§ — Edouard Chatton describes 

 Paramyxa paradoxa g. et sp. n., found within a pelagic Annelid larva. 

 Its spore is remarkable in showing a single parietal cell and no cnido- 

 blast— a unique exception in the class of Cnidosporidia, It seems to 

 require a new Cnidosporidian family for itself, and its inclusion within 

 the Cnidosporidia opens that class to forms like Peltomyces from cock- 

 roaches, where the spore is without a stinging apparatus, but protected 

 by a cellular envelope. 



Conjugation in Paramoeciiun.H — H. S. Jennings publishes the results 

 of an experimental study of the conditions which induce conjugation in 

 Paramcecium. He finds that they differ greatly in the different races 

 {P. aurelia or P. caudata). Some races conjugate freely and under con- 

 ditions readily supplied in experimenting. Others under the same condi- 

 tions do not conjugate at all. The interval between conjugation may 

 be very short — in one race epidemics of conjugation occurred at intervals 

 of two weeks to a month, while in a single case there were successive 

 conjugations at intervals of five days. In other races conjugation 

 occurred only at intervals of a year or more. Tn one race, carefully 

 watched, conjugation was not observed during a period of three years. 

 Frequent re-conjugation may be observed among the progeny of a single 

 individual. Conjugation occurred in the races favourable for experi- 



* Arch. Mikr. Auat., lxxviii. (1911) Festschrift Waldeyer, pp. 383-421 (2 pis.), 

 t Zeitschr. wiss. Zool., xcvii. (1911) pp. 605-72 (2 pis. and 8 figs.). 

 t i ontralbl. Bakt. Parasitenk., lvii. (1911) pp. 522-35 (2 pis.). 

 § Comptes Rendus, clii. (1911) pp. 631-3 (10 figs.). 

 || Journ. Exper. Zool., ix. (1910) pp. 279-99 (4 figs.). 



