ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 183 



Diatoms of Artesian Wells.* — P. Friedrich and H. Heiden give an 

 account of the litorine and prelitorine formations under the Priwall at 

 Travemiinde. The diatoms, met with in two strata of sand passed 

 through during the boring of artesian wells, were found to be of fresli, 

 brackish, and sea-water types, and belong to several tribes of the 

 Diatomaceaj. 



Revision of ChaBtoceras.t — C. H. Ostenfeld publishes a revision of 

 the marine species of Chsetoceras, section Simplicia, giving for each 

 species the synonymy, description, critical notes, and text-figures ; also 

 an analytical key. 



Algae of Franche-comte.J — J. Yirieux gives a list of the principal 

 algae of interest found by him in Franche-Comte, some rare, others not 

 previously recorded for France, others new to science. He describes the 

 latter and annotates the rest. 



Bryopsis muscosa.§ — A. Famincyn writes a few notes on Bryopsis 

 muscosa Lam., which he studied in a fresh condition at Monaco in 1909 

 to 1910. After summarizing the differences between the genera Bryopsis 

 and Fseudobryopsis, he describes his observations on the chlorophyll- 

 grains and chromatophores of B. muscosa. This alga is, he states, the 

 only one in which chlorophyll-grains and chromatophores may be 

 observed side by side in the same cell. The " chromatophore " is, ac- 

 cording to this author's definition, simply the coloured plate of the 

 chlorophyll-grain ; while the " chlorophyll-grain " includes the coloured 

 plate, the pyrenoid, the protoplasm, and the membrane. The author 

 proceeds to describe these bodies in detail, as well as the experiment by 

 which he demonstrated the functional difference between the outer, and 

 inner side of the chlorophyll-grain. The chromatophores are cut off 

 from the chlorophyll-grain by transverse division. The author remarks 

 also certain oval cells containing zoospores, which he found fairly often 

 on the main stem of B. muscosa — whether belonging to the alga or 

 epiphytic on it he could not determine. Also he observed that small 

 cells are cut off from many gametangia. Their development he was 

 unable to follow. 



Dictyosphaeria.ll — W. xlrnoldi continues his studies on the morpho- 

 logy of marine alg^e, and in the present paper describes the structure 

 of the thallus of Dktyosphseria. The material was collected by him- 

 self in the Malay Archipelago. The early stages of D. favulosa with 

 the long foot-like prolongation are described and figured, as also the 

 development of the tenacula, which may arise either from the foot-cells 

 or from the thallus direct. The other species, D. Versluysii^ W. v. B. 

 and D. intermedia W. v. B. were also examined. The structure of the 

 protoplast of Dictyospheeria is discussed ; and remarks are made on the 



* Mitt. Geogr. Ges. Nat. Hist. Mus. Liibeck, Reihe 2, Heft 25 (1912) 78 pp. See 

 alsoNu'ov. Notar., xxiv. (1913) p. 51. 



t Medd. Komm. Havundersog. Plankton, i. (1912) No. 10, p. 11 (24 figs.). 



: Biill. Soc. Hist. Nat. Doubs, No. 21 (1911) 10 pp. See also Nuov. Notar., 

 xxiv. (1913) p. 53. 



§ Ber. Deutsch. Bot. GeseU., xxx. (1912) pp. 431-5 (1 pL). 



II Flora, n.f., v. (1913) pp. 144-61 (1 pi. and figs.). 



