82 



nate nach ihrer Ankunft (fast sechs Monate seit dem Verlassen von Charkow) gut 

 gediehen. Er sagt, daß es wohl keinen Ort gebe (weiter als 4500 Werst vom 

 nächsten Meere) , wohin nicht Seethiere transportiert werden könnten. 



Boveri, Th., Das Genus Gyractis , eine radialsymmetrische Aktinienform. Ausz. 

 von G. V. Koch, in: Zool. Centralbl. 1. Jhg. No. 2. p. 57. 

 Zool. Jahrbb. — v. 1893. p. 422. 



Reapparance of the Freshwater Medusa, Limnocodium Sowerhii. in: Amer. 

 Naturalist, Vol. 28. Febr. p. 181—182. 

 From »Nature«. — v. 1893. p. 422. 



Hedlund, T,, Einige Muriceiclen der Gattungen Acanthogorgia , Paramuricea 

 und Echinomuricea im zool. Museum d. Univ. Upsala. Mit 3 Taf. in : 

 Bihg. k. Sv. Vet.-Akad. Hdlgr., 16. Bd. IV. No. 6. 1890. (19 p., Tit.) 

 3 n. sp. 



Davenport, 0. B., Studies in Morphogenesis. II. Regeneration in Obelia and 

 its Bearing on Differentiation in the Germ-Plasma. With 6 figg. in: Anat. 

 Anz. 9. Bd. No. 9. p. 283—294. 



The author experimented on Obelia commissuralis , the stem of which he cut at 

 three different levels. The whole stem and the hydranth , and a few rings only 

 and the hydranth, may be reproduced after a cut through the stalk at any of the 

 levels. The nearer the cut to the proximal end of the stalk , the greater the per- 

 centage of cases of reproduction of an entire stalk ; the nearer the cut to the 

 distal end, the greater the definiteness of regeneration, the less the mean number 

 of rings regenerated and the smaller both the upper and lower limit in the num- 

 ber of rings regenerated. These facts are expressed in curves (Galton's method). 

 Conclusions: the regenerative tissue is not differentiated at different levels to 

 produce different things, independent of environment, but may produce the same 

 things at all levels. In certain embryonic tissues a usual method of development 

 may be acquired, but this is not a character of the germ-plasma at all levels. The 

 regenerative tissue at all levels has a tendency to produce preferably certain forms 

 (in Ohelia 3 — 6 or 9 — 11 rings). 



13. Echinoderma. 



Grieg, James A., Ophiuroidea. Norske Nordhavs-Exped. XXII. Med 3 tavl. 

 og 1 kart. Christiania, 1893 [Februar 1894]. gr. 40. (Tit., 41 p.) 

 24 sp. and 1 var. representing 13 genera. Jeffrey BelVs system is followed. 

 Mortensen, T., Ophiopus arcticus. Abstr. in : Journ. R. Micr. Soc. London, 1894. 

 P. 1. p. 67—68. 



Zeitschr. f. wiss. Zool. — v. Z. A. 1893. p. 424. 

 Ootteau, G-,, Études sur les Echinides eocenes. Extr. in : Revue Scientif. (4.) 

 T. 1. No. 4. p. 120. 



Farasalenia Gosseleti n. sp., Tuberaster Gauth. , 4 n. sp. du g. Euspataìtgus. 

 Marenzeller, E. v., Contributions à l'étude des Holothuries de l'Atlantique du 

 Nord. Ausz. von H. Ludwig, in: Zool. Centralbl. 1. Jhg. No. 2. p. 57—58. 

 Rés. camp. Scientif. Monaco. — v. 1893. p. 217. 



14. Vermes. 



Braun, Max, Würmer. Vermes (Bronn' s Klassen u. Ordnungen d. Thierreichs). 

 31./32. Lief. Leipzig, C. F. Winter'sche Verlagshdlg., 1894. 8^. (p.927 

 —1006.) àLfg. Ji 1,50. 



Cestodes: Name, Umgrenzung, Geschichten. Litteratur (No. 1—385). 

 Repiachoff, AV., Spermatogenesis of Turbellaria. Abstr. in: Journ. R. Micr. Soc. 

 London, 1894. P. l.p. 65. 



Zeitschr. f. wiss. Zool. — v. Z. A. 1893. p. 219. 

 Bürger, O., Südgeorgische und andere exotische Nemertinen. Ausz. vom Verf. in: 

 Zool. Centralbl. 1. Jhg. No. 2. p. 59-60. 

 Zool. Jahrbb. — v. 1893. p. 428. 



