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SUMMARY OF CURRENT RESEARCHES RELATING TO 
spores within the cyst show an areolar proplasm with granulations, an 
excentric nucleus, and a central body. The development of the central 
body is described. It begins as a cluster of eosinophilous granulations, 
which form a group of vesicles, and these condense into a large spherical 
body with a concretionary concentric structure. The spores within the 
cyst are often united in groups by delicate strands. J. A. T. 
Eimeria in Pigeons. — Otto Nieschulz ( Archiv . Protistenkunde , 
1921, 44, 71-82, 1 pi., 3 figs.). A description of Eimeria pfeifferi 
Labbe, which infects pigeons and may be the same as E. tenella (Raillet 
and Lucet) in fowls. The parasites are most abundant in the mucous 
membrane of the intestine 50-70 cm. behind the stomach. The author 
deals with the schizogony, the development of the microgametes, the 
development of the macrogametes, the fertilization, and the oocysts. 
J. A. T. 
New Gregarines. — R. Poisson ( Oomptes Rendus Soc. Biol., 1921, 
84, 73-5). In the intestine of the fresh-water amphipod Echinogam- 
marus berilloni there was a new species of Cephaloidophora, probably 
the first of this genus in a fresh-w^ter crustacean. For a Gregarine in 
the food-canal of the sandhopper Orchestia littorea the name Frenzelina 
mereieri sp. n. was suggested. This name is pre-occupied, and a 
reference to the genus Uradiophora is proposed. J. A. T. 
Giardia enterica in Man.— Charles E. Simon ( Amer . Journ. 
Hygiene , 1921, 1, 440-91, 3 pis.). A description of the trophozoite of 
this remarkable flagellate and of the encysted stage. The shape is 
pyriform, the dorsal surface arched, the ventral surface with a large 
cytostome. The nuclei are two, dorsal to the cytostome. They are 
elliptical in the resting stage, each with a karyosome, whence a fine linin 
fibril leads to a chromatin mass at the anterior nuclear pole which 
probably represents a centrosome. From each centrosome a rhizoplast 
curves slightly forward and inward to a blepharoplast granule. The 
flagella are in four pairs. The caudal flagella pursue a straight though 
convergent course from the blepharoplasts to two basal granules at the 
tip of the somewhat bifurcated tail. Their intra-cytoplasmic portions 
are the axostyles. The ventral flagella originate from two basal “ rods ” 
apparently attached to the axostyles. A little posterior to their origin 
lies a club-shaped “ parabasal body.” J. A. T. 
