512 NEW AND RARE FRESHWATER ALGiE, 



specimens agree perfectly with them in all points, as well as with 

 Sp. mirabilis. 



SpiROGVRA NEGLECTA (Hass.) Klltz. (PI. Iviii., f.l 13). 



A. — Cell. veg. diam. 46-57, alt. 53-360; cell, fruct. diam. ad 

 dissep. 46-57, ad inflation. 65-68, alt. 42-125/^. Zygospora^ ut 

 sequitur: — 



a. Zygo. late ovales, long. 52-66, lat. 42-49//. (PI. Iviii., f.3). 



h. Zygo. longiiis ovales, long. 64-74, lat. 45-51/j(.. (PI. Iviii., f.4). 



c. Zygo. elliptic^, long. 78-91, lat. 46-51/x. (PI. Iviii., f.5). 



cL Zygo. oblongse, long. 75-80, lat. 45-51/x. (PI. Iviii., f.6). 

 Lismore (353). 



Cf. Petit, Spirog. d. Paris, p. 26, PL ix., f.l -5; Borge, Zygne- 

 males, p. 2 9, f.3 6. In the very short cells, there are generally 3 

 chloroplasts making 1 turn: in the long cells, 3-5 chloroplasts 

 making 2-3 turns. Three forms of chloroplast also were noted 

 intermixed; all, however, had the central ridge, which is said to 

 be characteristic of the species: — 



(1). As in Petit, /.c, a narrow delicate band with minutely 

 irregular edges, and very small, almost indistinguishable, pyre- 

 noids. Only noted in uncopulated cells of fertile filaments. 

 (PI. Iviii., f.7, 8). 



(2). A very delicate band with finely fimbriated edges; also 

 with very minute pyrenoids. (PI. Iviii., f.9, 10). 



(3). A more robust band with edges irregularly scalloped, not 

 fimbriated, and with large, distinct pyrenoids. (PI. Iviii., f. 1 M3). 



Four distinct shapes of zygospore were noted in this one 

 sample, and, in such profusion, as to be all present under the 

 cover-glass at one time. Inflated sporangial cells, and uninflated, 

 were noted in the same conjugated filament (PI. Iviii., f.l, 2). 



B. — Cellular vegetativse paullo crassiores ; zygosporis paullo 

 majoribus; chloroplastidibus tenuibus laciniatis. 



Cell. veg. diam. 62-64, alt. 70-120; zygo. long. 94-100, lat. 

 52-56/x. Lismore (297). 



A broader specimen than usual, with slightly larger zygospores. 

 In gatherings of Sp. neglecta there may generally be noted a few 



