16 \Y. 15. TURNER, FKF.SH-WATFK AI.O.F OF FAST IMMA. 



Long. 120—150, lat. 19—20 /u. 



T. I, f. 19. 



Much like M. De Greyii, Nob., but far larger. I was at first in doubt that these 

 might prove to be the cellules of a stage of Zyynema, but further inspection proved 

 them not to be so, as no signs of median divisions are apparent. 



Gen. 3. Cylindrocystis, Mengh.; De Bary. 



Organogr. p. 26, 1838! De By. Conj. p. 74, 1858; Penium Breb. and Ralfs Ex. p.; 



Palmogloea Kutz. Ex. p. 



1. Cyl.? minutissima, n. sp. Cyl. parvissima, eire. duplo longior quam lata, utrinque 

 rotundata, paullo in mediam partem incurvata. Membrana glabra; apicibus rotundatis. 



Long. 12—13, lat. 6.5—7 ,u. 



T. I, f. 24. 



Nearest to Cyl. Tatrica, Raoib., from which it differs principally in being slightly 

 constricted, and also smaller in size. From the remnants of the endochrome I judge 

 it to be a Cylindrocystis. 



2. Cyl. diplospora, Lund. (Desm. Suec. p. 83, t. V, f. 7; Schizospora pachyderma Reinsch, 

 Contrib. p. 87, t, XVII, f. 1). 



Long. 64, lat. 31 /u. 



T. VII, f. 8 (also Wallich Mscr. No. 93). 



3. Cyl.? depressa, n. sp. C. mediocris, circ. duplo longior quam lata; lateribus leniter in- 

 curvatis, apicibus depresso-rotundatis. A vertice visa perfecte circularis. Membrana glabra. 



Long. 42—50, lat. 23—25 ,//. 

 T. VII, f. 11, (also Wallich Mscr. No. 94). 



Near to the preceding species, but smaller and slightly different in shape, and 

 without the apical inerassation of the membrane found in Cyl. diplospora. 



4. Cyl. ovalis, n. sp. C mediocris, 2 — 2 1 / 2 ~pl° longior quam lata; eellulis ovalibus, la- 

 teribus ventricosis, apicibus rotundatis. Membrana crassa, glabra. 



Long. 40—42, lat. 17—20 //. 

 T. I, f. 5. 



This is nearest in size to Cyl. crassa De By., but differs from it in its regularly 

 oval shape. 



5. Cyl. Brebissonii, Mengh. (Organogr. pp. 5, 26, 1838; .Penium Brebissonii Kai.fn Br. 

 Desm. p. 153, t. XXV, f. 6 b— i, non a, 1848). 



Long. 40—50, lat. 20—34 /*. 



Central India, J. S.; (Himalayas, Roy). 



The genus Cylindrocystis, like Penium, makes two sub-genera, dependent upon the sides 

 being plain or contracted; the sides in many forms being incurved although not »constricted» # 



A. Cyclocystis (;<r^og, orbis; xvotig, cellula). Sides not concave. 



Typ. sp. Cyl. crassa, ovalis. 



B. Clitocystis (xAtrog, devexitas; etc). Sides concave. 



Typ. sp. Cyl. diplospora, depressa. 



