ZOOLOGY AND BOTANY, MI0RO80OPY, ETO. 977 



conjugation in Difflugia glohulosa. He further describes cases of actual 

 conjugation in Euglypha, and enumerates the points by which these can be 

 distinguished from cases of division. The individuals, after conjugation, 

 either divided or encysted in the manner which Gruber describes ; but, in 

 one instance, two conjugated Euglyphse formed one large one, which in- 

 cluded the protoplasm and fused nuclei of both elements, and which finally 

 encysted. 



Planispirina.* — M. C. Schlumberger describes the three most import- 

 ant species of the genus Planispirina, whose dimorphism has not yet been 

 noticed : they are, P. sigmoideM Brady, P. celata Costa, and P. edioardsi 

 n. sp. He next proceeds to discuss the opinion of Mr. H. B. Brady as to 

 the generic distinctiveness of these and some allied forms, and, contrary to 

 the judgment of that naturalist, comes to the conclusion that the mode of 

 disposition of the chambers of their tests is suflQciently characteristic to 

 justify the creation of a new genus, for which M. Schlumberger proposes 

 the name of SigmoiUna. 



New Parasitic RMzopod.f — M. A. Giard finds that at Concarneau, 

 and especially at Fecamp, the Cancerilla, which is parasitic on Amphiura 

 8quamata,t has on its own carapace a fine parasitic Ehizopod. This, which 

 may be called Podarcella Cancerillse g. et sp. n., is a pedunculated Arcellid. 

 The peduncle adheres to the cephalothorax of the host by a small discoidal 

 expansion ; it is once and a half as long as the funnel-shaped cupule which 

 terminates it, and, like it, it is formed of a substance which is apparently 

 chitinous. The amoeboid body moves slowly in this cupule. 



Amoebae of Variola vera.§ — Dr. A. van der Loeff placed some pock 

 matter taken from two persons suffering from confluent small-pox in 

 sterilized tubes, and examined it on the evening of the same day in 

 hanging drops. The same corpuscles — Proteida> or Amcehse — were found 

 in large numbers and of various configuration, as were found by the author 

 in fresh animal lymph. Even in cover-glass preparations the Amcehae 

 could be easily recognized after staining with fuchsin. 



Protozoa of the Black Sea.|j —Miss B. Pereraslavtzeva has endeavoured 

 to make the list of Black Sea Protozoa more approximately complete. The 

 memoir includes a list of 100 species. Of these 18 are new, and are 

 described and carefully figured. The author has also sought to test the 

 accuracy of the generalizations formulated by Merejkowski in regard to 

 the geographical distribution of the Protozoa, and has been forced to 

 refute them. 



Parasites in the Blood.^f — Prof. B. Danilewsky concludes his study 

 of the hematozoic parasites of the tortoise. In investigating the different 

 organs, he found but little of importance in the spleen or kidney, except 

 that in the latter he detected the presence of the Gregarinoid spores in the 

 pseudonavicella stage. The study of the medulla in the bone-cavities yielded 

 valuable results, especially in young tortoises. In this tissue the hfemo- 

 Gregarinid parasites are extremely abundant in all stages of development — 

 young, adult, and free. The various forms are described in detail. The 

 investigation of the marrow was the more important since Bizzozero and 

 Torre have maintained that this tissue is in the tortoise the sole seat of 

 the manufacture of red blood-corpuscles. In the haematoblasts, as was to 



* Bull. Soc. Zool. France, xii. (1887) pp. 475-88 (1 pi.). 



t Comptes KenduB, civ. (1887) p. 1191. % See this Journal, ante, p. 537. 



§ Monatshefte f. prakt. Dermatol., 1887. 



II Mem. Soc. Ne'o-Russ. Natural. Odessa, x. (1886) p. 2 (3 pis.). Cf. Arch. Slav, de 

 Biol., iv. (1887) p. 116. \ Arch. Slav, de Biol., iii. (1887) pp. 370-417. 



