248 



Layers in striped Muscles. With. 1 pi. in: Zool. Jahrbb. (Spengel), Abth. 

 f. Anat. u.Ontog. 7. Bd. 3. Hft. p. 533—544. 



The questions: »can the phenomena presented by the muscle fibrils in the 

 difl'erent phases of contraction be explained as the attraction of the isotropous 

 layer towards, and its absorption by, the anisotropous layer; is this the only 

 factor in the movement of contraction ; can the anisotropous layers be considered 

 as nuclear, attracting as such the clear protoplasmatic substance?« the author 

 answers in this way. The isotropous layer in some way disappears into the 

 anisotropous (which possibly has a definite structure [Schäfer's longitudinal 

 pits]) . The whole contraction of the muscle »element« can be accounted for by the 

 movements of the isotropous substance , the anisotropous layer only indirectly 

 causing the contraction by absorbing the isotropous substance. The anisotropous 

 substance is nuclear. 



Driesch, H., Entwicklungsmechanische Studien. VII — X. Ausz. von F. v. Wag- 

 ner, in: Zool. Centralbl. 1. Jhg. No. 7. 15. Mai [8. Juni], p. 263—264. 

 Mitth. Zool. Stat. Neapel. — v. Z. A. 1893. p. 406. 



Roux, W., Experimental Embryology. Abstr. in: Journ. R. Micr. Soc. London. 

 1894. P. 3. p. 320—321. 



Biol. Centralbl. — v. Z. A. 1893. p. 406. 



Zlebs, Geo., Über das Verhältnis des männlichen und weiblichen Geschlechts 

 in der Natur. Jena, G. Fischer, 1894. 8». (30 p.) Ji —,80. 

 Rectoratsrede. 



7. Descendenztheorie. 



Lendenfeld, K. von, Haacke's Gemmarienlehre. in: Biol. Centralbl. 14. Bd. 

 No. 11. p. 413—416. 



v. L. hält die Lehre für wenig glücklich. 



8. Faunen. 



Fleutiaux, E. , (Pour la défense du continent lémurien). in: Ann. Soc. Entom. 



France, Vol. 62. 4. Trim. Bull. p. CCCXXIX. 

 Wallace, Alfr. Euss. , The Palaearctic and Nearctic regions compared as re- 

 gards the Families and Genera of their Mammalia and Birds, in : Natural 

 Selene, Vol. 4. June, p. 433 — 445. 



By a careful comparison of their mammalia and birds, founded on statistical 

 lists, it is shown, that the Palaearctic and Nearctic Regions , instead of being so 

 much alike that they should be united to form a single region, are really excep- 

 tionally distinct. 

 Dahl, Friedr., Die Thiervs^elt Schleswig-Holsteins. III. Die Säugethiere. in: 

 Die Heimat. 4. Jhg. No. 5/6. p. 113—141. 



8 Chiropter., 5 Insectivor., 11 Carnivor., 15 Rodent., 2 Perissodactyl., 6 Artio- 

 dactyl., 4 Pinniped., 15 Cetac. 

 Moller, Adph. Fred., Subsidies para o estudo da Fauna de Portugal, in: Annaes 

 de Selene. Naturaes, Porto, Ann. 1. No. 1. p. 41. 

 Lumbriciden und Unionen. 



Notas sobre a fauna da Serra do Suajo. ibid. p. 42 — 45. 



"Wesentlich Notizen über Wirbelthiere. Arion Nohrei Pollonera , u. A. lusi- 

 taniens Mabille Allolobophora complanata Dug. 

 Keller, Oonr., Das Leben des Meeres. Lief. 2. Leipzig, T. O. Weigel Nach- 

 folger. 1894. (p. 49—96, 1 Taf., Fig. 9—29). Jl 1,—. 

 V. supra, p. 130. 

 Koehler, K., Une excursion zoologique à Cette. Lyon, impr. de A. Storck. 

 1894. 80. (8 p.). 



Compte rendu sommaire. 

 Vanhöfifen, Ernst, Biologische Beobachtungen während der Heimreise der 

 Expedition von Grönland, in: Verhdlgn. d. Ges. f. Erdkde. Berlin, 

 21. Bd. 1894, No. 2/3. p. 143—150. 



Zoologische Vorkommnisse in dem durchfahrnen Meere. 



