158 W. B. TUftNER, FEESH-WATER ALG.E OF EAST INDIA. 



Ord. II. PROTOCOCCACEtE (Mengh.) Rabh. 

 Gen. 1. Closteridium, Reinsch. 



(Fam. 1'olvedr. Monogr., 'Notarisia' p. 510, 1888; Reinschiella De Tom Sylloge Chlor. p. 612, 1880. Ophio- 

 cytium ex p. Rabh. Flor. Eur. Alg. III, p. 66; Wolle Fr. Alg. U. S. Ainer. p. 175 ex p., non Naeg.) 



1. Cl. Bengalicum, n. sp. C. minus, curvatum, semi-lunatum, utroque line attenuato- 

 apiculatum; massas pardulas gregariter formans. Habitu fere Closterio (Closteridio!) 

 cuspidato Bailey (in Ralfs' Br. Desm. }). 219, t. XXXV, f. 11) accedens sed multo 

 minus. 



Long., across are ef cell, 16, lat. 6, long. spin. 5 — 6 /u. T. XX, f. 25, after 

 Wallich Mser. No. 322. 



»Endochrome granular», G. C. W. 



This plant is nearest to Closteridium capitatum (Wolle) Nob., Wolle 1. c. p. 

 176, t. 158, f. 3 — 7, from which it differs in the apices being attenuate. 



[There appears to be little reason for the alteration, by Dr. De Toni in Sylloge 

 1. c, of this generic name!] 



Gen. 2. Polyedrium, Näg., Einz. Alg. p. 83; Reinsch Monogr. 1888. 



1. P. tetraedricum Näg. Einz. Alg. p. 84, t. IV, B 3 f. be. 



Long. 18—23, lat. 16—20, lat. centr. 7—10 /u. 



fi torsuni, n. f. 



In this form one half of the frond is twisted at right angles to the other half. 



T. XX, f. 15 X 600; after Wallich Mser. No. 292, f. 2, 3. 



2. P. trigonum, Näg., 1. c., t. IV B, f. 1. 



Long. 10, crass. 5 /u. Sec. G. C. W. Mser. No. 295. T. XXL f. 13. 

 Raneegunge, Nov. 1855. 



3. P. bifidiiin, n. sp. P. trigonum, lobulatum, angulos versus attenuatum ; angulis pro- 

 duetis bifidis; a latere visum lanceolatum utroque fine attenuatum. 



Long. 13—17, crass. 4.5—5.5 /u. T. XX, f. 23 X 1000; after Wallich Mser. 

 No. 294. 



Can this possibly be a triangulär Pediastrum, allied to such a form as P. Sttmnii, 

 Reinsch, Alg. Frank. t. VII, f. 1 a? 



4. P. proteiforme, n. sp. P. magnum, indistincte lobulatum, 2 — 3-gonum, angulos versus 

 attenuatum; angulis magis produetis sinuatis acutis; a latere visum (3-gonum) acuto- 

 lanceolatura. 



Long. 65, crass. 12 //. F. 3-gona, lat. s. proc. 36 /'. 



T. XX, f. 24; a. f. 2-gona, b. f. 3-gona; after Wallich ^Iscr. No. 287. 



The forms have apparently a habit of crossing each other, which is suggestive 

 of Kutzing's Micrasterias cruciata (Syn. Diat. p. 71, t. VI, f. H^)\ the sinuous apices 

 are remarkable. 



5. P.? sp. Diam. 37, long. sp. 2 ,«. T. XVII, f. 11. 



This form secms intermediate between P. tetraedicum Näg. and enorme Ralfs 

 (cfr Reinsch 1. e. t. V, f. 3 b, and VII, f. 2 a. 



