268 SUMMARY of CURRENT RESEARCHES RELATING TO 



development of intercalary bandson each side of the meridional suture. 

 These bands show the specific ornamentation. The formation of inter- 

 calary hands is a structural preparation for division, and the hands are 

 transitory protective screens, which are got rid of when division occurs. 

 The division restores the typical form of individual. Some systematic 

 consequences of this interpretation are noted. Thus P. vastum is the 

 megacytic form of a species, the normal types of which are represented 

 by the so-called acuta variety of P. vastum. 



Upper Silurian Foraminifera of Gothland.* — John Smith reports 

 on a collection including several new species of Hyperammiuu, Webbina, 

 Laijena and Nodosaria. Twenty-nine species are recorded, of which 

 ten are new. Thirteen of the twenty-nine species are also recent, and 

 all the Cambrian species (eleven) are still extant. 



Leishmaniosis of Dogs.f — A. Laveran has studied the natural 

 leishmaniosis of dogs which has been observed in all the regions where 

 .Mediterranean kala-azar is endemic. It is symptomatically and other- 

 wise closely allied to the leishmaniosis which is readily produced by 

 inoculating dogs with Leishmania infantum. The author discusses the 

 relationships between L. tropica, L. donovani and L. infantum, asking, 

 for instance, whether L. tropica may not be a variety of one of the 

 others. 



Schizogony in Sarcoeystis muris.J — Ehoda Erdmann finds that 

 small amoeboid and schizogonic forms appear in the intestms six 

 days after infection. These small schizogonic forms (0'3-0'4u) 

 -consist of a minute protoplasmic body with a karyosome nucleus, and 

 arise from smaller amoeboid organisms which shew typical Bchizogonj , 



* Ann. Nat, Hist., xv. (1915) pp. 301-9 (1 pi.). 



t Ann. Inst. Pasteur, xxix. (1915) pp. 71-104 (2 pis ) 



% Proc. Soo. Exper. Biol., xi. (1914) pp. 152-3, 



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