Physiologie. — Palaeontologie. 651 



Plasma erklärt wissen. Bezüglich des Wertes der Blütenfarben stellt 

 er sich auf den Standpunkt von Hess nachdem die Bienen alles 

 grau in Grau sehen, weil sie farbenblind wären (eine Auffassung 

 welche bekanntlich von Frisch starken Widerspruch erfahren hat). 

 Er misst denselben keine ökologische Bedeutung bei. sondern meint 

 auch hier, dass sie nur als Photokatalysatoren die Entstehung spe- 

 zifischen Eiweisskörper vermitteln. Neger. 



Tubeuf, C. V., Wann keimt der Ulmensamen? (Naturw. 

 Zeitschr. Forst und Landwirtsch. XIII. p. 481-482. 1915.) 



Der Verf. erörtert näher die bekannte Tatsache, dass Ulmensa- 

 men die im Sommer geerntet wurden, z.T. sofort z.T. erst im fol- 

 genden Frühjahr oder erst nach Verlauf mehrerer Jahre zur Keimung 

 kommen. Neger. 



Stephenson, L. W., Cretaceous deposits of the eastern 

 Gulf Region. (U. S. Geol. Surv. Prof. paper 81. p. 1—77. PI. 

 1-22. 1914.) 



This paper is chiefly stratigraphical and zoological. The strati- 

 graphical part contains on some pages f. i. 11, 26, 33, 39, lists or 

 determinations of fossil plants. These list are chiefly copied from 

 the papers by Berry, who also named most of the plants of the as 

 yet unpublished lists. Jongmans. 



Walcott, C D., Cambrian Geology and Paleontology. 

 III. 2. Pre-cambrian Algonkian Algal Flora. (Smithson. 

 Miscell. coli. LXIV. 2. p. 77—156. PI. 4-23. 1914.) 



The first part contains general considerations on continental 

 conditions during Algonkian time, the origin of Algonkian limestones, 

 the deposition of limestone ihrough the agency of algae, magnesian 

 limestones and the algal flora. In the latter chapter a comparison 

 is made between recent Blue-green algae deposits and those of 

 Algonkian time. Special attention is laid on the resemblance of 

 some of the fossils and the so-called Lake balls. 



A large number of new genera and species are described and 

 illustrated. 



Newlandia nov. gen. occurs in the lower portion of Newland 

 limestones on the eastern slope of Big Belt Mountains, Montana. 

 Four species are distinguished : N. concentrica, N. frondosa, N. 

 lamellosa, N. major. These species are more or less irregulär 

 semispherical or frondlike forms built up of concentric, subparallel, 

 subequidistant thin layers that may be connected by very irregulär, 

 broken partitions. 



Kinneya nov. gen. with K. simulans occurs in the same locality. 

 It differs from Newlandia in its finely laminated arrangement of its 

 layers and interspaces and the marked bifurcation of the layers 

 forming the body. 



Weedia nov. gen. with W. tiiberosa occurs in the upper part of 

 the Altyn limestone series, Glacial National Park, Montana. The 

 specimens show a concentric laminated structure which points to 

 an origin similar to that of the encrustations made through the 

 agency of Cyanophyceae. 



Greysonia nov. gen. with G. basaltica occurs in the lower portion 

 of Newland limestone, on the eastern slope of Big Belt Mountains, 



