ZOOLOGY AND BOTANY, MICROSCOPY, ETC. o41 



Moss Exchange Club. — Tirenty-fifth Annual Report. (York : 

 Coultas and A'olaiis, 192(i, 255-66.) A list of the British and foreign 

 mosses and hepatics collected and distributed by the members of the 

 club, with critical notes on the more interesting specimens. A. (t. 



Thallophyta. 

 Algae. 



Auxospore-formation of Chsetoceros debile Cleve. — K. Yexdo and 

 J. Ikari {Bot. Mag. Tokyo, l'.)18, 32, 145-9, 1 pL). Auxospore-forma- 

 tion has been observed in about 20 out of the 160 genera of diatoms. 

 It has been previously described in Chsetoceras by Schiitt and others, 

 and the present authors give a detailed account of the process in 

 C. (Mile, which they had the chance of observing on a free scale near 

 Oshoro. A. Ct. 



Diatomaceous Earth of Lompoc, Santa Barbara Co., California. — 

 X. Yermoloff {Geoloji. Mag., 1020, 57,271-7). The siliceous remains 

 in the fossil deposit of Lompoc belong to two main and dominating 

 groups of organisms, Dictyochidie and Diatomaceae. The diatoms are 

 all pelagic and nearly all discoid, with only a very few gonoid forms. 

 They are all undoubtedly northern forms ; indeed, very similar to those 

 usually common in European seas. The author discusses the composition 

 of the deposit in detail, noting the presence or absence of certain genera 

 and species. The predominating genera are Euodia, Coscinodiscus and 

 Thdlassionema, together with the silico-flagellate Dictyocha, and these 

 give to the deposit its characteristic facies. Of the nine groups of 

 Coscinodiscus only five are represented in Lompoc ; the constituent 

 species of these groups are analysed and discussed. Finally, an enumera- 

 tion is given of all the species recorded. E. S. Gepp. 



Rare Species of North American Diatomaceae. — C. S. Boyer {Bull. 

 Turr. Bot. Club, 1920, 47, 67-72, 1 pi.). Descriptions of eleven new 

 species, and of Xavicula Attwoodii Perag., which is here figured for the 

 first time. Abnormal forms of Aulacodiscus oregonus are discussed and 

 compared, and it is suggested that these specimens may be evidences of 

 the formation of gonidia. Numerous valves occur in rich gatherings 

 much smaller than the normal valve and of uniform size, equal to that 

 of the partially formed valves in the specimen figured. In each of the 

 specimens examined the internal finely granular plate is distinctly 

 shown, but its function in the formation of new valves is problematical. 



E. S. G. 



Fresh-water Diatoms from Iceland.— Ernst 0strup {The Botany of 

 Iceland : Copenhagen, J. Frimodt : London : J. Wheldon, 1920, 2, Part I., 

 1-98, 5 pis.). A posthumous paper based upon 572 samples of diatom 

 material collected by various hands in several parts of Iceland. The 

 work is divided into two parts : — 1. A. systematic list containing refer- 

 ences to literature and descriptions of 57 new species and 13 varieties, 

 which are all figured in the plates. 2. An alphabetical list of the 468 



