120 W. B. TURNER, FRESII-WATER ALG.E OF EAST INDIA. 



Bsbb. (Liste p. 136, t. I, f. 22), but I believe that Breb.'s plant == St. euxtephanum 

 Ehr. {Desmidium eustephanum Kun. Verbr. p. 124, t. IV, f. 23, 1843), both of which 

 are granulate, with serrate arms and margin, while this is quite smooth, besides dif- 

 fering in other details. 



67. S. subarmigeruin, Roy et Bisset (Jap. Desm. p. 239, t, 2(59, f. 2, 1886) forma. 



Long. 22, lat. 21 (s. proc), long. 28, lat, 32 (c. proc), lat. istli. 8—10, long. 

 proc 4—5 ju. Wallich, in Mscr. No. 220, gives long. et lat. (s. proc) 31, lat. istli. 

 8.7, long. proc 8—9 u. T. XIII, f. 31. 



In this peculiar plant the processes are the exact reverse of those in St. furca- 

 tum, being 2 superior and 1 inferior at each angle, and divergent. From the above 

 dimensions it appears that the forms noted by Wallich were larger than those I have 

 seen, and also the Japanese plants of R. and B. Could it not be eonsidered as a 

 reversed variety of St. furcaturn? 



68. S. arcnatiim, Nordst. (Norg. Desm. p. 30, t. I, f. 18, 1873). 



Long. 20—24, lat. 28—32 (s. proc); lat, isth. 7—9 /u. Me G. C. W. Mscr No. 

 244. T. XIV, f. 20, after Wallich 1. c 



There seems to be but little difference bctween the Norwegian and Indian forms, 

 except that the dorsal processes in the latter are a little longer and in vert. v. are 

 more divergent, 



69. S. Hantzchii Reixsch (Spec Alg. Fung. p. 129, t. XXII I) f. 4, 6, 1, 1866; St. in- 

 tricatum Delp. ex parte (Desm. Sub. Alp. ]>. 139, t. XI, f. 10, 14, 15, 20; excl. f. 

 11? 12, 13, 16, 18, 21; 1JS77) — var. cornutuni, n. v. 



L<mg. 24, lat. 20 (s. proc); long. et lat, 30 (c proc); lat. isth. 9, long. proc. 

 6—7 /u. 



This variety, though smaller in size, differs but little from Reixschs form except 

 in the length of the processes. It is nearly equal in dimensions to the Italian plant 

 of Delponte. T. XV, f. 23. 



70. S. infestum, n. sp. S. parvum, fere tam longum quam latuin; semicellulis cuneatis, 

 dorso convexis, ventre paullo inflatis; angulis tribus rotundate fissis, in processus rectos 

 binos divergentes productis; dorso apud angulos processubus 3 sub-erectis brevibus 

 munito; processubus omnibus apice furcatis; superficie tota la?vi; sinu brevi, sub-acuto. 

 A vertice visum triangulare, lateribus paullo convexis, processubus ad angulos radiatim 

 dispositis. 



Long. 17, lat, 13 (s. proc,); long. 22, lat, 19 (c. proc); lat. isth. 5, long. proc 

 dors. 2, long. proc ang. 4 — 5 ju. T. XV, f. 21. 



71. S. Royii, n. sp. S. minus, fere tam latuin quam longum; semicellulis cuneatis, dorso 

 convexis, ventre paullo inflatis; angulis 3 — 4, late rotundate tissis, in processus rectos 

 binos divergentes productis; dorso supra angulos processubus (icquali longitudine cum 

 inferioribus) sub-erectis 3 — 4 munito; processus omnes furcati; membrana glabra; sinu 

 brevissimo, rotunda to. A vertice visum 3 — 4-angulare, lateribus paullo convexis; pro- 

 cessubus (1 super, et 2 infer.) ad angulos productis radiantibus. 



Long. 22, lat. 18 (s. proc); long. 32, lat. 30 (c proc); lat. isth. 8. long. proc. 

 7—8 fi. T. XV, f. 25. 



