INFUSORIA. 
571 
3. Butsciili, O. Vorlaufige Mittheilung einiger Resultate von Studien 
liber die Conjugation der Infusorien, &c. Z. wiss. Zool. xxv. pp. 
426-441. • 
4. Fromentel, E. de. ^Itudes sur les Microzaires ou Infusoires pro- 
prement dits comprenant de nouvelles recherches sur leur organisa- 
tion, leur classification et la description des especes nouvelles ou peu 
connues. Planches et notes descriptives des especes par Mme. J. 
Jobard-Muteau. Paris: 1874, 364 pp. 30 pis. (c/. J. Zool. iv. pp. 
340-342). 
6. Hertwig, R. XJeber Podophrya gemmipara nebst Bemerkungen zun 
Bau und zur system atischen Stellung der Acineten. Morphol. JB. 
i. pp. 20-82, pis. i. & ii. (Separately, “ Beitrage zur Kenntniss der 
Acineten”: Leipzig and Jena.) (Abstr. Arch. Z. exp^r. v. pp. viii. 
ix.) 
6. Jackson, W. H. On a new peritrichous Infusorian {Cyclochoita epon- 
gillce). Q. J. Micr. Sci. xv. pp. 243-249, pi. xii. 
7. Sim ROTH, H. Zur Kenntniss des Bewegungsapparates der Infusions- 
thiere. Arch. mikr. Anat. xii. pp. 61-86, pi. ix. 
Anatomy and Physiology. 
According to the researches of Hertwig (5), the Acineta are true uni- 
cellular animals ; in Podophrya gemmipara the tentacles are differen- 
tiated into pointed prehensile organs and suctorial tubes ; they are not 
pseudopodial prolongations from the protoplasm of the body, but con- 
tinued through the investing cuticle towards the cenj;ral part of the 
body. Podophrya propagates through partially ciliate “ swarmers,” 
which are formed as buds froin the upper tentaculiferous surface. The 
“nucleus” is first horse-shoe shaped, afterwards strongly ramified, 
one clavate branch penetrating into each bud. The partial ciliation and 
rudimentary “cytostome” is favourable to the hypothesis, that the 
Acineta ov Infusoria suctoria are derived phylogenetically from the In- 
fusoria ciliata. Critical remarks on the morphology, &c., of the In- 
fusoria are scattered through the paper. 
E. Buck, “ Die Acinete im Aquarium ” ; Zool. Gart. xvi. pp. 90-92. 
Balbiani (2) criticises Stein’s observations on the conjugation and 
reproduction of Vorticellina {Carchesium)^ and maintains that a fecun- 
dation through spermatozoic filaments really takes place ; during the 
conjugation, the “ nucleolus ” (testis ?) of the swarmer or “ microgoni- 
dium,” is divided into 2 nucleoli, which are afterwards found in the new 
individual, resulting from the conjugation. Some of the nuclear frag- 
ments become ova, while the others reconstitute the nucleus; but they do 
not form a “ placenta,” in the interior of which the embryos originate, 
as Stein describes. 
On cases of Balantidium coli and their treatmefit; S. Henschen & 
J. A. Walderstrom, Upsala, Lakare foren. Forh. ix. p. 579, x. p. 120 
(Nord. Med. Ark. vii. No 4, p. 17). 
