606 SUMMARY 'OF OUKRENT RESEARCHES RELATING TO 



stroma, Ilea, Enter omorpha. Viva, and Zetterstedtia. Of these, 

 Mastodia and Zetterstedtia are natives of the southern ocean ; Ilea is 

 represented by a single species, I fulvescens, growing at the mouths of 

 some Swedish rivers. 



Newly-found Antheridia of Floridese.* — T. H. Buffham briefly 

 sums up what is known concerning the reproduction of the Floridese, 

 and gives more particular descriptions of the antheridia of species 

 not figured by Harvey. 



In Callithamnion tetricum the antheridia appear to be almost 

 terminal, and the principal portion of the mass is on the inner face 

 of the ramulus, which in the specimen figured is bent down by its 

 weight. Call, hyssoideum has antheridia that are quite hyaline, with 

 the exception of the cellules forming the axis. The antherozoids are 

 very elongated, and their attachment can scarcely be made out. In 

 Call. Turneri the antheridia cluster thickly on the ramuli, and are of 

 ellipsoidal form, colourless, and filled with antherozoids. The 

 antheridia of Call, plumula are ramose, and occur in clusters, all 

 rising from one cell of the ramulus. 



In Griffithsia corallina the antheridia cluster round the filament 

 at the junction of two cells. 



Figures of the foregoing, as well as of the antheridia of Ptilota 

 elegans, Ceramium diaphanum, and C. strictum are given by the author. 



New Unicellular Algae. t — P. Eichter describes the following 

 new species of Algas (or Protophyta) : — Protococcus gemmosus, in 

 greenhouses, allied to P. cinnamomeus ; Dictyosphcerium glohosum ; 

 Aphanocapsa Naegelii, in greenhouses ; Aphanothece nidulans, an 

 extremely minute species, in greenhouses, along with Protococcus 

 grumosus ; Oscillaria scandens, also in greenhouses, possesses a strong 

 smell, somewhat resembling patchouli ; Scytonema Hansgirgianum, 

 in similar situations, allied to S. Hofmanni ; Nostoc Wolluyanum. 



The author states further that his Aphanothece caldariorum is the 

 bacillus-form of Glaucoihrix gracillima Zopf, and is probably identical 

 with Aphanocapsa nehulosa A. Br. and Glosothece inconspicua A. Br. 



Structure of Diatoms.} — Count Castracane gives a very useful 

 epitome of the chief points in the structure and different modes of 

 reproduction of diatoms. 



Belgian Diatoms,§ — Dr. H. van Heurck has published the first 

 two sets (including fifty species) of slides illustrating his Synopsis 

 of Belgian Diatoms, determined and described by A. Grunow. The 

 specimens are, for the most part, preserved in the fluid composed and 

 described by van Heurck, compounded of styrax and liquidambar, 

 which has a higher index of refraction than Canada balsam ; || a few 

 in solution of phosphorus. 



* Journ. Quekett Micr. Club, i. (1884) pp. 337-44 (3 pis.). 



t Hedwigia, xxiii. (1884) pp. 65-9. 



X Castracane, Conte Ab. Francesco, 'Generalita su le Diatomee,' 12 pp. 

 Eoma, 1884. 



§ Van Heurck, H., ' Types du Synopsis des Diatomees de Belgique,' Se'rie i. 

 et ii. Anvers, 1883. 



II Infra, p. 655. 



