78 W. B. TURNEB, FBESH-WATEB ALG^E OF EAST INDIA. 



This gpecies seems widely distrilmted. 

 Bengal; Northern India, J. S. 



15. E. crassum, Bbéb. (Cosm. crassum, Bbéb. in Mengh. Synops. p. 222, 1840; Eu. pelta, 

 Ralfs Annals p. 190, t. VII, f. 1, 1844, non Cos. />elta, Gokda; Eu. crassum, Ktz. 

 Phye. Germ. p. 135, 1845). 



Wallich, 1. c. j). "283. 



Note. The var. fi of Ralfs Br. Desm. p. 81, t. XI, f. 3 e, as suggested by Lundell 

 (L)esni. Suec. p. 19) is probably the same as E. ventiricosum, Lind., I. c. t. II, f. 2. 



16. E. ainpulluceiini, Ralfs (Br. Desin. p. 83, t. XIII, f. 4) var. im-avatum. Seinicellula- 

 parte centrali vix tumidae, tumoribus 4 (2 basalibus, 2 apicalibus) ornatse; uaembrana 

 punetata. 



Long. 66, lat. 38, lat. isth. 10 ,«. T. X, f. 59. 



This differs considerably from the type in having the ventral portion of the semi- 

 cells without swellings. 



Northern India; also Zelleb an<l Rabii. 1873. from Arracan. 



17. E. reiitricosimi, Lind. (Desm. Suec. p. is, t. II, f. 2) var. Horidamim (Eu. Floridanum, 

 TuBNER Desm. ]). 935, t. XV, f. 7). E. centrali parte sub-planum non vel paullo 

 tumidum; lobo polari exserto. Fére nt in specim. Americanis. 



Long. 94. lat. 55, lat. isth. 15 .". T. XI, f. 1!». 

 Central India; one (semicell.) only seen. 



18. E. obesum, Joshua (Burm. Desm. p. 638, t. XXIII, f. 19, 20) f. glabra. Membrana 

 glabra, non granulata. 



Long. 58—65, lat. 37—44, lat. isth. 16—17 u. T. X, f. (il. 



I at first (18<S3) deseribed this in litt. as E. latum, mihi, hut afterwards deemed 

 it to be a punctate form of E. pingue Elfv. (Finsk. Desm. ]). 7, t. I, t. 3, Oct. 18S1; 

 = E. Armstrongianum Abcheb (sp. ined.) in Dubl. Club Proc July 1881; Annals X. II. 

 vol. XI, lss;5, pp. 213 — 14); as some of the specimens resemble it in outline; still as 

 I have seen none granulate, (which nearly all the specimens of E. pingue are,) I place 

 it under the species published l»v Joshua. For the fäet that Elfvings species is the 

 same as Abchers I am indebted to Mr. J. Roy, 4 Apl. 1885. The form figured is 

 the smooth, not punctate or granulate, one. 



19. E. erosnm, Lind. (Desm. Suec p. 22, t. II, f. ii), formae: 

 b. f. attenaata. Semicellulas e basi regulariter attenuataB. 



Long. 29, lat. 15, lat. isth. 6 //. T. X, f. 21. 

 » 27, » 17, » » 7 ,». » » f. 18. 

 c f. undata. Semicellula? attenuatas, lateribus valde undatae. 



Long. 26, lat. 15, lat. isth. 5 f. T. X, f. 23. 



b. Bengal: c Northern India. 



The forms are all, apparently, smooth. It may be that c is referäble rather to 

 E. crassicolle Lind. 1. c. (p. 23, t. II. f. 8) than to this species. 



Note. The Eu. sublobatum (Reinsch) non Bbéb., forma; Keinsch Contrib. p. 92'. 

 t. XIII, f. 4 (44.8x25 ,") seems to be but a large specimen of the Swedish form of 

 E. erosum. 



