106 W. H. TLKNKK, FRESH WATEU ALO.K OF EA8T IXDIA. 



spines so placed. In Nordstedt's form (Dk By 1. c.) this is so; tlie Indian specimens 

 having the aculei straight and nearly parallel. Is this the same as Phyc. convergens 

 Perty, Kl. Lebensf., p. 210, t. XVI, f. ,34a? 



Y recta (Ralfs in Annals 1. c. f. 5 a super, sinistr.; St, dejectum rar. /? Br. 

 Desm. p. 121, t. XX, f. 5 c). K. minor (isthino elongato). 



L. IG— 18, lat. IS (ne. incl.), Lat. isth. 3— 4 ; 1. spin. 1.5—2.7 /n. T. XIX, f. 

 15 (forma monstrosa, fide G. C. W. Mscr. No. 267, f. 3.). 



The elongate isthmus of these Indian forms is peculiar: in this and in the next 

 it is more noticeable tlian in the European planta, and might stånd as F. Indica of 

 both of them. 



12. S. dejectum (Bréb. in Mengh. Synops. p. 227, 1840; St. dejectum a Ralfs Kr. Desm. 

 p. 121, t. XX, f. 5 a; St. mucronatum fl Ralfs in Annals N. H. p. 152, t. Xa infer. 

 sinistr.; St. dejectum Lund. Desm. Suec. p. 59, No. 14). 



/? apiculatum Lund. (1. c. p. 59 — 60; Stau. apiculatum Bréb. Liste p. 142, t. I, 

 f. 23). F. Indica (isthmo elongato; latitudine minus quam F. Furopa-a). 



Long. e. acul. 22 — 25, s. acul. 16 — 1'.), lat. 13 — 16, lat. isth. 4 — 5, long. acul. 

 3 — 5; Zygosp. s. acul. diam. 22, 1. acul. 8 ,u. T. XIX, f. 14 (also in Wallich Mscr. 

 No. 267, f. 1, 2); Zyg. T. XX, f. 14 (after G. C. W. Mscr. No. 314). Buebissons 

 *S. apiculatum seems to be only a. small form of bis St. dejectum; cfr. remarks 1>\ 

 Lundell, 1. c 



Y counatuin, Lund. (1. c. p. 60, t. III, f. 2S = St. mucronatum fi Ralfs in An- 

 nals 1. c, t. X, f. 5 a super, dextr.). F. isthmo paullulum elongato. 



Long. c. acul. 30, lat. 16 — 19, lat. isth. 5 — 6, long. spin. 6 — 8 ,w. 

 Like /^, this is smaller than the European form. 

 Hab. />'. Bengal; y. Northern India. 



13. S. aristiferum? Ralfs (Br. Desm. p. 123, t. XXI, f. 2). Y. planum, n. v. Angulis 

 non productis vel mammillatis, apice planum, a vertice visum robustius et crassins 

 quam F. typica; isthmo non elongatum). 



Long. 32, lat. 38 (spin. incl.), lat. isth. 7, long. spin. 6—8 ,«. T. XVI, f. 32. 

 This plant seems intermediate between S. aristiferum and S. rasp/datum Bréij.; 

 it has the plane apex of the latter, with the shorter isthmus of the former. 



14. S. megacanthum Lundell (Desm. Suec. j>. 61, t. IV, f. 1, 1871). Var. expressuin, 

 n. v. Minus quam F. typica, depressum; fröns s. acul. latitudine magis quam Ll-plo 

 longit.; apicibus fere planis. 



Long. 24— 2S, lat. c acul. 50—56, lat. isth. 8—9, long. acul. 7—9 ,«. T. 

 XVI, f. 29. 



In the front vicw is not so robust as the Swedish plant, but in the vcrtical 

 aspect it is more so. 



15. S. Kurzianuni, n. sp. S. rnediocre, quinta parte latius quam longum; semicellulis ovato- 

 fusiformibus dorso convexis, lateribus turaidis; angulis 3 quoque in processum divcr- 

 gentem paullo recurvatum attenuatum sub-acutum protentis; sinn aperto, cuneato, in- 

 terne rotundato; membrana glabra. A vertice visum trian gulare; lateribus paullo in- 

 curvatis, apud angulos paullo inflalis. 



