Palaeontologie. — Algae. 151 



and european oligocene, also in the tertiary of South America. 



The oldest species of Eiigenia occur in ihe Upper cretaceous 

 Dakota sandstone, other species in Eu ropa from the Lower Eocene 

 to the Pliocene, and the genus is recorded from the Tertiary of 

 Ecuador. 



Myrciaria is known from the Tertiär}'- of Ecuador. 



Callistenion has been identified in both the Upper cretaceous 

 and tertiary of Europe. Callistemophylluin includes upper creta- 

 ceous forms in both America and Europe, eocene or oligocene 

 forms in Greenland and numerous oligocene and miocene species 

 in Europe and Australia. 



Metrosideros has been recorded from the uppcr cretaceous of 

 Greenland, but this is probably an erroneous identification. In 

 Europe species are found in the oligocene and miocene. 



Leptospernmm, Leptospermites and Leptospermocarpmn have 

 been identified from the upper cretaceous and tertiary of Europe, 

 Tvistanites (fruits) from the lower miocene of France and the 

 miocene of Australia. 



Psidiu-tn is represented in Chile by an early tertiary species. 



Jongmans. 



Davis, A. R., Enzyme action in the marine algae. (Ann. 

 Missouri Bot. Garden. IL p. 771—836. 1915.) 



The results of this paper are summarized by the author as 

 foUows : 



Using Standard methods of enzyme isolation and determination, 

 the following enzymes have been found in fresh or dried algal 

 tissue {Viva lactiica, Enteroniorpha intestinalis, Laminaria Agardhii, 

 Ascophyllum nodosuni, Mesogloea divaricata, Ceramium rubrum, 

 Agardhiella tenera, Rhodymenia palniata, Chondrus crisptis): 



a. Carbohydrases hydrolysing the Polysaccharides, starch, dex- 

 trin, gl3?-cogen, and laminarin, but not those hydrolysing the seve- 

 ral disaccharides employed as Substrates. 



b. Lipases acting upon neutral fats but not upon the esters of 

 the lower fatty acids. 



c. Proteinases (tryptic and ereptic) acting best under neutral 

 and alkaline conditions. 



d. Nucleases. 



e. Oxidases and peroxidases (in but two forms: Agardhiella 

 and Ulva). 



f. Catalases. 



Negative results were obtained for cellulase, cytase, maltase, 

 lactase, sucrase, amidase, and esterase. 



The action of all the enzymes isolated was very slow. 



Jongmans, 



Elenkin, A. A., Note sur une algue nouvelle, Leptobasis 

 caucasica mihi (nov. gen. et sp.), suivie dela revision cri- 

 tique du genre Microchaete Thur. (Bull, Jard. imp. bot. Pierre 

 le Grand. XV. p. 5-22. 14 Fig. 1915.) 



Au fin de son travail, public en langue russe, l'auteur donne le 

 rösume suivant en langue frangaise. 



L'auteur decrit une nouvelle espece des Cyanophycees qui a 

 et6 trouvee par lui et par M. Savicz au Caucase aux environs de 

 Gagry en 1912 sur les pierres d'un fleuve. 



