516 NEW AND RARE FRESHWATER ALGvE, 



a massive parietal chloroplast with a central globular locellus in 

 which the pyrenoid (when present) is situated.* Excellent 

 figures are given by Goroshankin, I.e., PL ii., f.l4, and by G. S. 

 West, Br. Frw. Alg., p. 18 8, f.73A, B, but in each case the 

 pyrenoid is eccentric. Fresenius says '■'■In der Mitte p'ln scharf 

 umschriehener Kern.^' Ours, on the other hand, are smaller, 

 (Rabenhorst, however, rejDorts specimens of 6-8/x diam.) quite 

 spherical and without any apical protuberance. The cell-wall, 

 generally very thin, is sometimes stratified. This species, con- 

 sidered the most common in Europe, is very rare here, in my 

 experience. I obtained it (the only time) from two local ponds 

 in October, 1917, after the spring rains, in some quantity- 

 Though I had assiduously worked these pools for five years pre- 

 viously, I had never seen a sign of it before, nor have I noted it 

 since from either. 



Carteria bullulina, nom.nov. 

 Syn., Carteria multifilis, forma, Australian Frw. Phytoplankt., 

 these Proceedings, 1917, p. 824, PL Ivi., f.1-4. The expression 

 "closely fitting membrane" {dicht anliegenden Hant) in Frese- 

 nius' description of C. imdtifilis rules out this form from any 

 connection with the latter. My description. I.e., applies to the 

 cell-membrane ; the mass of cytoplasm is much smaller and 

 attachea at the apex (fig.l). The details of the chloroplast, I 

 have not yet noted. 



Carteria granulosa, n.sp. (PL Iv., f.7, 8). 



Cellula compressa, fronte visa psene circulata, superne fissura 

 obliqua instructa; a latere valde compressa, superne in cornua 

 duo divisa, cornibus evolutis. Membrana rufescens, granulosa. 

 Cytoplasma retractum, ad cellulse apicem affixum, a latere com- 

 pressum. Pyrenoidis nulla nee stigma (in speciminibus notatis). 



Long. 31|, lat. 29|, crass, 10/x. Lismore. 



A compressed form, with granulate cell-wall. Above, the cell- 

 wall is divided into two rounded overlapping heads by a deep 



* When the pyrenoid, as in this ease and manj' others that I have 

 noticed, is. central, it would seem to enclose the nucleus. 



