ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 527 



Ccelentera. 



Hermaphrodite Tubularian.* — Charles P6rez describes a specimen 

 of Tubularia humilis Allm., which bore for the most part female buds, 

 but had also at one place, side by side, a female group, a male group, 

 and a mixed group — with one male and one female bud. The presence 

 of embryos and the absence of ripe spermatozoa showed that the herma- 

 phroditism was protogynous. Bonnevie has recorded hermaphroditism 

 in T. asymmetrica Bonn., even within the same bud, and exceptional 

 hermaphroditism in Hydractinia humilis within the same gonophores. In 

 Myrwtliela there is also hermaphroditism. 



Variations in Eleutheria dichotoma.f — A. Drzewina and G. Bohn 

 have studied the variability or plasticity of the buds produced by this 

 Medusoid. Great diversity occurred under the influence of changes in 

 aeration, temperature, staleness of water, and so on. The arms are 

 normally six, and bifurcated at about half tlieir length ; forms with five, 

 seven, and eight arms occurred, and the bifurcation was often anomalous. 

 The position of the arms and of the buds exhibited great diversity, and 

 concrescence both of arms and of individuals occurred. 



Protozoa. 



Studies on AmoebaB.^ — A. Alexeieflf continues his studies of Amoebte 

 of the Umax group. It seems that Dujardin's Amo&ha Umax should now 

 be called VahJkampfia Umax, that lYimastigammba phihppinensis Wliit- 

 more (which has probably only two flagella) is referable to Vahlkampfia 

 and Dimastig amoeba Blochmann likewise, and that Sappinia is a genus 

 on the boundary line between Amoebae and Acrasi^ (Mycetozoa). 



Lagenae from S.W. Pacific. § — H. Sidebottom reports on part of a 

 large collection of Lagenae made by the late W. Blundell Thornhill, 

 which includes many new forms. The numerous variations show how 

 many of the so-called species run into each other. 



Opalina mitotica.|| — Maynard M. Metcalf describes this interesting 

 new species (from the rectum of Amblystoma Ugrimim) in which the 

 nuclei " rest " in a mid-mitotic or late anaphase condition instead of in 

 the ordinary network or granular condition. It may be the imperfection 

 of the achromatic part of the mitotic figure, throwing all the activity 

 upon the chromatin, that allows this departure from the otherwise 

 universal behaviour in mitosis. 



Stigma of Euglenids and Kinetonucleus of Biflagellates.lF — A. 

 Alexeietf adduces evidence to show that the stigma of Euglenids is homo- 



* G.R. Soc. Biol. Paris, Ixxii. (1912) pp. 1088-90 (1 fig.). 

 t G.R. Soc. Biol. Paris, Ixxii. (1912) pp. 1027-9. 

 + Bull. Soc. Zool. Prance, xxxvii. (1912) pp. 149-68 (3 figs.). 

 § -Journ. Quekett Micr. Club (1912) pp. 375-434 (8 pis.). 



II Zool. Jahrb., Supp. XV. Bd. 1 (1912) Festschr. Spengel, pp. 79-94 (1 pi. and 

 1 fig.). 



f Arch. Zool. Exper., x. (1912) Notes et Revue, No. 3, pp. ixvi-lxxii (2 figs.). 



