68 W. B. TURNER, FRESH-WATER ALG.K OK KAST INDIA. 



(Sinne Desm. ]>. 935, t. XVI, f. (i), but dififers therefrom in the basa! angles, mem- 

 brane and tumidity, isthious and sinas. 



105. C. gradatum, n. sp. C. submediocre, paullulum latius quam longius, late ovale; semi- 

 cellula3 late flabelliformes, centro tumida!, dorso semicirculares, angulis basalibus sub- 

 rectse; margine einarginato-incisa (vcl in eugositatibus latis secta — circ. 16), emar- 

 ginationibus ipsis plerumque incisis; membrana glabra; sinn profundo, angusto-eune- 

 ato. A vertice visum acnte-ovale, centro tumidum; a latere modice constrictum, 

 semicellulse longe ovales, medio tumidae, verrucibus conspicientibus »gradatim» ordi- 

 natis (ex quibus noiuen speciei). Zygospora gloltosa, processubua longis ad apices 

 trifidis (apud marginem circ. 12) armata. 



Long. 44, lat. 47, lat. isth. 11, crass. 19; zyg. diam. s. acul. 27, c. acul. 44 ,u, 

 T. X, f. 1 (also Wallich Mscr. 269; zyg. No. 276). 

 In this species the apex is sometimes sub-truncate. 



106. C. depressum, (Näg.) Lund. {Eaastrum (Tetracanthium) depressum, Nägeli, Einz. Alg. 

 p. 114, t. VII c, f. 2; Cos. depressum Lund. Desm. Suec. p. 38; non Bailey) var. 

 gramilatum. Parvum, magis depressum, superficies min ute granulata (see. Wallich 

 Mscr. No. 155). 



Long. 20.5, lat. 25, lat, isth. 6 ,«. T. X, t'. 3. 



Smaller and more depressed tlian the type. : Covered with very delicate tubercles 

 (granules) which give a rough appearance to the edge», G. G. \Y. 



et typica. I have the typical form of C. depressum, eomm. (i. v. L., from Kha- 

 sia, upon the river Brahmaputra (ex Utricularia sp.), and froin East Bengal (ex 

 Utr. flexuosa); both from the Stockholm Museum. 



107. Cos. sp. (C. punctulato Bréb. accedens) forma monstrosa. 



T. IX, f. 52x600, after Wallich Mscr. No. 152, faesimile. 



This very curious monstrosity has two aborted cells proceding from the dexter 

 and sinister sides of the isthmus of a normal semicell. 



108. C. Barrackporeanum, n. sp. (.'. submediocre, tertia parte longius quam latum; clepsydri- 

 forme; semicellulae late ovatae, e basi leniter dilatatae, apice rotundata», margine cre- 

 nato-Undulatae; membrana juxta isthmum laevi, in superiore parte semieellularum serie- 

 bus tribus granulorum concentrice ordinatis instrueta; sinu valde aperto, brevi, rotun- 

 datOj extrorsum amplissimo. A latere visum fere ut a fronte sed paullo compressum. 



Long. 42, lat. 31, lat. isth. 16, crass. 24 ,". T. X, f. 4. 

 Barrackpore. 



109. C. occidentale, Nob. (C. gemmatum, Turner, Some Desm. p. 935, t. XVI, f. 5- — non 

 Cos. (Eu'l) gemmatum (Bréb.) Ktz., Kalks' Br. Desm. p. S7) var. ornatuin, n. v. 

 C. cum duabus (non tribus) seriebus granulorum marginalium, et ventre semieellu- 

 larum eum granulis vel nodulis in lineas duas (circ. nuniero 3 et 1) eoneentrice po- 

 sitis ornato; reliqua ut in f. typica. 



Long. 46, lat, -12, lat. isth". 18 ,". T. X, f. 5. 



My friend Dr. Nokdntkdt has suggested that, to avoid confusion, it will be weU 

 to ehange this naiiie; I do so accordingly. Cfr note under No. M, a species some- 

 what related to this one. 



