GO SUMMARY OF CURRENT RESEARCHES RELATING TO 



He gives diagnoses of seventeen new species of Myriothela, Etu/endrium,. 

 Balecium (2), Lafoeina, Gampanularia (2), Obelia, Thyroseyphus, Ser~ 

 tuhi rella (3), Selaginopsis (2), Schizotrichia (2), and Plumularia. 



New Leptomedusan.* — Seitaro Goto describes a new craspedote 

 medusa, Olindioides for mom. g. et sp. n., from Misaki, related closely to- 

 Gonionema and Halicalyx, more distantly to the fresh-water genera 

 Limnocodium and Limnocnida, and differing from its nearest relative 

 Olindias miilleri in many striking points, e.g. in having six radial canals 

 instead of fonr. In the meantime the sub-family Olindiadae must rest 

 under the Eucopidae among the Leptomedusan. 



Early Development of Eudendrium.f — C. Hargitt gives an account 

 of the oogenesis and early development of E. ramosum, together with 

 notes on two or three other species. The ova arise in these hydroids 

 by differentiation of cells of the entoderm or of the ectoderm or of 

 both. They appear in the region of the hydranth or lower in the 

 ccenosarc of the stem. No evidence as to the process of fertilisation 

 was found. Further, in maturation no trace of polar cells could witli 

 certainty be recognised. The nucleus disappears, probably by frag- 

 mentation and gradual dissolution. Later it shows but slight trace of 

 chromatin granules, and subsequently becomes more transparent, com- 

 pletely losing its chromophilous properties. After fertilisation its early 

 reorganisation into one or more nuclear centres constitutes the initial 

 impulse of development. With the massing of deutoplasm in the centre 

 of the egg the cytoplasm is forced into a peripheral layer. Nuclear 

 activity, slightly involving the cytoplasm, takes place ; the deutoplasm 

 divides into a series of yolk-balls within some of which bodies, sug- 

 gestive of nuclei, are present. During the whole period the egg remains 

 a syncytium. Especially in the earlier stages of this period the nuclei 

 differ greatly both in size and shape. Nests of nuclei often showed 

 evidences of having resulted from the amitotic division of a larger 

 nucleus. Other evidences of amitosis were present. The paper con- 

 tains also an account of the formation of ecto- and endoderm, and also 

 the life-history of the planula. 



Protozoa. 



Physical Imitations of the Activities of Amoeban 4 — H. S.Jennings 

 reviews the experiments made by Biitschli, Rhumbler, and others. The 

 imitations show that a drop of a certain emulsion may, through physical 

 factors, exhibit locomotion, may move toward certain agents and away 

 from others, and may exhibit " choice " in the taking in of certain sub- 

 stances and the rejection of others. But they do not show specifically 

 through what physical factors the activities are, as a matter of fact, 

 brought about in Amoeba? or in any similar organisms. 



Few of the experimental imitations of the activities of Amoeban 

 stand before a critical comparison- with what actually takes place in the 

 living animal. Such comparison shows in almost every case that the 



* Mark Anniv. Vol., 1903, pp. 1-92 (3 pis.). 

 t Zool. Jnhrb., xx. pp. 257-73 (3 pis.). 

 I Amer. Nat... xxxviii. (1904) pp. 625-42. 



