ZOOLOGY AND BOTANY, MICROSCOPY, ETC. Ml.:! 



those along each side of the orifice, are bicuspid, large, and similar to 

 those on the supra-oral lamina. In this combination of characters, the 

 new type, which was found in the open Atlantic, differs from Bathymyzon 

 and Petromyzon. A small black fresh-water lamprey, Abbott's Ammo- 

 codes cepytera, also known as Lampetra wilderi Gage, is re-named Lam- 

 pet ra (epytera (Abbott). 



Faunistic Results of German South Polar Expedition.* — 

 H. Lohmann summarises the distributional data. The distribution of 

 01igocha3ta and Isopoda does not support the idea of the previous 

 existence of an Antarctic Continent uniting the three Southern Con- 

 tinents. Regarding plankton — Pteropods, Salpa, Appendicular ia, Tin- 

 timiEB — the Antarctic region is throughout richer in species than the 

 Arctic. The majority of the polar forms deviate widely, yet bipolar 

 varieties and species groups have been proved. Of sea mites, only 

 Halicaridas were found in the Antarctic region. Of these a small species 

 group of Polymela proves to be bipolar. This family also predominates 

 in the Kerguelen Islands. On St. Paul and at the Cape the Antarctic 

 species and most of the Kerguelen forms are absent. A brief description 

 of the sea mites found is given. 



&* 



Bipolarity of Marine Animals.t — W. Kukentkal discusses this 

 subject, treating of littoral, abyssal, and pelagic forms. A number of 

 littoral animals show marked bipolarity. With regard to abyssal forms 

 no very valuable results appear to have been attained, yet the author 

 regards the existence of bipolar animals as possible. It is most strongly 

 indicated amongst plankton. The author considers that migrations of 

 different kinds have been the cause of bipolarity, e.g. in the case of 

 pelagic forms from the warm water areas. The floor of the sea has 

 probably been the former connecting path for many littoral forms ; in 

 others the west coasts of the continents may have made an exchange 

 possible. 



Northern Animals.} — Fritz Romer has published an interesting 

 lecture on the northern animals in their relation to the fauna of tem- 

 perate zones, and in their special adaptations to boreal conditions. 



INVERTEBRATA. 



Mollusca. 

 a. Cephalopoda. 



Chromatophores of Cephalopods.§ — W. Marchand reviews the 

 literature— more particularly the works of Rabl, Steinach, Chun, and 

 Hertel — on the subject of the structure and function of these bodies. 

 The play of colour in the skin of Cephalopoda is conditioned by the 

 iridocytes and by the chromatophores. The latter possess a distinctive 



* Schrift. Natur. Vereiu. Schleswig-Holstein, xiv. (1906) pp. 1-14. See also 

 Zool. Zentralbl., xiv. (1907) pp. 392-3. 



t Veroffentl. Institut. f. Meereskunde, heft 11 (1906) 28 pp. See also Zool. 

 Zentralbl., xiv. (1907) p. 392. 



% SB. Senckenberg. Nat. Ges., 1907, pp. 63-112. 



§ Zool. Zentralbl., xiv. (1907) pp. 289-301. 



