ZOOLOGY AND BOTANY, MICROSCOPY, KTC. 421 



Apical Growth of Trentepohlia.* — G. S. West and E. 0. Hood 

 give an account of the structure of the cell-wall and the apical growth 

 in the genus Trentepohlia. The cell-walls are lamellose, and consist of 

 cellulose. In some species the lamellae are parallel, and extend and 

 grow in proportion to the growth of the apical cell. In other species 

 the apical cell covered by the youngest lamellae grows up by bursting 

 through the older layers ; the lamellte diverge above. In many species 

 an apical cap of pectose is secreted at the free end of the apical cell, 

 being more developed where the apical wall is thin. The pectose cap is 

 protective in function. 



Bacillarieae Immobiles.t — A. Forti discusses a method of classifica- 

 tion of the immobile Bacillarieog founded on the morphological affinity 

 of the frustules, and in relation with the evolution of the ausospore. 

 He gives a series of tables to show the genealogical derivation of the 

 genera of the BaciJlariese Lmnobiles, and a series of analytical tables of 

 the families and genera in relation to their genealogy. These are in 

 Latin, and are full of microscopic characters. 



Diatoms of Boulog'Qe-sur-Mer.J — G. Cepede gives an account of the 

 fauna and flora of the old l)oats and quays of Boulogne-sur-Mer. In 

 the intestines of Ciona and in other animal organisms were found various 

 diatoms, nearly a score in number. 



Italian Fossil Diatoms. § — A. Forti gives a preliminary list of the 

 fossil diatoms in the white calcareous marl of Monte Gibbio (Sassuolo- 

 Emilia), a stratum of the Middle Miocene, The number of species 

 enumerated is 102. 



DiatomaceaB of the Pacific. || — H. and M. Peragallo give an account 

 of the marine Diatomace^ collected by C. Rechinger in the Solomon 

 Islands, Samoa, and Hawaii during his expedition in 1905. 



Scenedesmus and Pediastrum.f — J, B. Petersen writes on the 

 tufts of bristles in Scenedesmus and Pediastrum. They are arranged in 

 fascicles, and resemble those already described by Schroeter, Zacharias, 

 and Chodat. Petersen indicates the method employed to render them 

 visible — for they are very small, • 2-0 ' 6 ft or less ; and they are not 

 always present even in organisms from the same locality. They occur all 

 the year round in Scenedesmus, and disappear during the winter in 

 Pediastrum. 



Morphology of Dasycladaceae.** — W. Arnold! writes on the mor- 

 phology of some of the Dasycladace^ — BorneteUa and Acetabularia. He 

 collected the material in the Malay Archipelago, and fixed it according 

 to the most approved methods, his object being to compare his results 

 with that of previous authors, who have had only dried specimens and 

 alcohol-material for study. He gives the life-history and structural 



* New Phytologist, x. (1911) pp. 241-9 (figs.), 



t Atti R. 1st. Veneto, Ixxi. (1912) pp. 677-731. 



X Ann. Inst. Oceanogr , iii. fasc. 5 (1911) 7 pp. (1 pL). 



§ Nuov. Notar., xxiii. (1912) pp. 79-84. 



Il Denkschr. Mat. Nat. k. Akad. Wiss. Wien, Ixxxviii. (1911) pp. 3-11 (2 pis.), 



t Bot. Tidsschr., xxxi. (1911) pp. 161 -76 (figs.). 



** Flora, iv. (1912) pp. 85-101 (1 pi. and figs.). 



