ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 347 



Dasycladaceae of the Danish West Indies.* — F. Borgesen gives an 

 account of the species of Dasycladaceae collected by him in the Danish 

 West Indies. The first species is Neomeris anaulata Dickie, of which 

 he describes and figures variations in the form and size of the sporangia. 

 The plant occurs both on sheltered and exposed coasts, and seems to be 

 rather common. Batophora Oerstedi is next discussed, and the author 

 agrees with M. A. Howe in considering the name Batophora must hold 

 good instead of Botryophora. Acetubalaria caliculus is fully described 

 and treated of, and its identity with A. Suhrii is regarded as fairly 

 established. A. crenulata and Acicularia Schenhii are also recorded. 



Tetmemorus in New England.f — J. A. Cushman records for New 

 England the four species of this genus known from the British Isles. 

 In New England the plants occur mostly in sphagnum pools, and seem 

 to be more common at an elevation, being found very abundantly in 

 certain mountain ponds with sphagnous borders. A description and the 

 corrected synonymy for each species is given and measurements taken 

 from New England specimens. A key to the New England Tetmemorus 

 describes shortly the differences between the species.. 



Lower Chlorophyceaa.} — B. Gerneck has made cultivations of a 

 considerable number of the lower Chlorophyceas, which he gathered in 

 ditches, etc., in the neighbourhood of Gottingen. In the introduction to 

 his paper on the subject, he describes in detail the methods he employed 

 in obtaining his cultures, while in the special part which follows he gives 

 the results of his work in connection with each special organism, and 

 describes new genera and species. In the second or general part the 

 author discusses such questions as the influence of light and temperature, 

 that of the substratum of the culture, and of higher concentration of 

 nutritive solutions in connection with his results ; also the influence of 

 the culture medium on the manner of growth and on the formation of 

 gelatin, as well as the production of reserve material. He then describes 

 the transition to resting stages in the older cultures, the formation of 

 involution cells under conditions of exhausted soil, the formation of 

 swarm-spores and the methods of bringing this about, and the occur- 

 rence of gametes. Copulation was only observed in two species of 

 Cystococcus, and did not take place in ChJorosarrina minor nor Gbrocystis 

 vesiculosa, which possesses zoospores generally regarded as sexual. The 

 author regards the appearance of akinetes and aplanospores as being 

 probably the result of a lack of nutritive salt in the culture substratum. 

 Finally a list is given of the literature consulted. 



Diatoms in an Aquarium. §— H. Peragallo has examined the diatoms 

 growing in an aquarium at Banyuls which had been left untouched for 

 five years, and he states that he has rarely met so interesting a collection. 

 Among the 63 species and 9 varieties, only two are surface epiphytes, 

 which were probably introduced at the time of washing, previous to 

 examination. The predominating species in the aquarium vary very 



* Bot. Tidssk., xxviii. (190S) pp. 271-83 (9 figs, in text), 

 t Bull. Torrev Bot. Club, xxxiv. (1907) pp. 599-601. 

 X Beih. Bot. Centralbl., xxi. (1907) pp. 221-90 (2 tables). 

 § C.R Soc. Biol. Paris, Ixiv. (1908) pp. 99-100. 



