596 SUMMARY OF CUERENT RESEARCHES RELATING TO 



Reproduction of Dinenympha gracilis Leidy.* — Antonio de Zulueta 

 describes the division of this Flagellate commensal from the intestine 

 of Termes lucifugus. There is distinct mitosis, in which the centre of 

 division is the basal body of the undulatorj membrane. The nuclear 

 membrane persists through all the phases. There is an intranuclear 

 achromatic spindle and an equatorial plate formed by differentiated 

 chromosomes. The author compares this type of division with that 

 occurring in other Protozoa. 



New Astomatous Ciliate.f — Iwaji Ikeda describes 3Ietaphrya 

 saqiitae g. et sp. n. from the coelom of Sagitta. It is a radially sym- 

 metrical organism, except that the anterior end is somewhat deflected 

 towards one side. Fine but long cilia occur in twelve longitudinal 

 shallow grooves. Below an investment of finely granular cytoplasm, 

 indistinctly differentiated into ectoplasm and endoplasm, there is a 

 curious strongly refractive wavy layer, and within that a clear, fluid-like, 

 non-plasmic substance. Sections show that the refractive layer is a 

 basketwork-like macronucleus, made up of threads of chromatin. The 

 micronucleus lies in the transverse plane passing through the middle of 

 the body. It is spindle-like, 5 /x in its major diameter. The central 

 substance may be reserve material, perhaps a colloid of a protein nature. 



Small individuals showed some important peculiarities. The 

 youngest was 20 /* by 10 /x in contrast to the largest 0"25 mm. by 

 0*13 mm. The body was covered uniformly with short cilia. The 

 macronucleus was of much simpler configuration— a relatively thick and 

 sinuously winding thread, which may bear some short branches ending 

 freely. The micronucleus was much as in the adult, but the central 

 non-plasmic substance was entirely absent. Excretory vacuoles are 

 present, and non-plasmic spherules. It is probable that this interesting 

 form should be referred to Anoplophryiidte, and regarded as a highly- 

 advanced representative. 



Sporozoa from Fishes. | — J. W.Mavor describes from the St. Andrews 

 region, Canada, some interesting Sporozoa from fishes, especially from 

 the gall-bladder, Geratomyxa acadiensis sp. n., Alyxidium bergense 

 Auerbach, Goussia gadi Fiebiger, etc. In the gall-bladder of the hake 

 {Urophycis chuss), the new species of Geratomyxa was usually found 

 attached to an undetermined parasite (probably a species of 31yxidium 

 or Ghloromyxum), which is itself attached to the gall-bladder. 



* Trabajos Mus. Nacional Ciencias Naturales, Serie Zool., No. 23 (1915, received 

 1917) pp. 1-26 (1 pi.). 



t Annot. Zool. Japon, ix. (1917) pp. 317-24 (6 figs.). 



X Contributions to Canadian Biology, i. (1915) pp. 25-38 (1 pi. and 6 figs.). 



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