108 W. B. TUKNER, FRESH-WATER ALO.E OF EAST INDIA. 



externe eapitato-rotundatis. Forsan varietas sp. prseeedentis, sed in speciininibus nul- 

 Inni aculeura observatum fuit. 



Long. 25 — 30, lat. 27 — 31, lat. isth. eirc. 7 /u. T. XV, f. 17 (also in Wallioh 

 Mscr. Xo. 264, f. 2). 



Like Xo. 18, verv comnion. Xokdstedt suggests that tliis is the preceding spe- 

 cies, »in wich the spines had been broken off». I think not; as if so some would 

 have been seen with only 1, 2 or 3 spines — but in nos. 18 and 1!) I saw either 3 

 — 4 aculei or none! 



20. 8. baculiferum, n. sp. S. subinedioere, circ. tam longius quam latins; semicellulis 

 cuneatis, ad angulos protento-mammillätis, dorso cönvexis, lateribus sinuatis; angnlis 

 processulms tenuibus capitatis divergentibus instrnctis; isthmo elongato, tenui; mem- 

 brana laevi; sinu apertissimo, interne angnlato. A vertice visum triangnlare, lateribus 

 magis eoncavis; ad angulos inflatum, angulis acuto-rotundatis. 



Long. 30—35, lat. 35, lat. isth. 6, long. spin. 10 //. T. XIV, f. 25 (after Wal- 

 lich Mscr. No. 268). 



Raneegunge, Xov. 23, 1855. G. C. W. 



21. S. bifldum (Ehub.) Bréb. (in Ralfs Br. Desm. p. 215; Lundell Desm. Suec. p. 62, 

 t. I\ r , f. 2; Desmidium bijidum, Ehr. Abhl. Berl. p. 292, 1832; Infus. p. 141, t. X, f. 11 

 (in tabulå D. bidens pro errore!); Phycasirum bijidum, Kutz Phyc. Germ. \). 138; 

 Stu ur. exsectum, ('leve in Rabh. Alg. Eur. Xo. 1925. fide Lundell 1. c). Var. tortum, 

 n. v. Angulis tortis; spinis non verticaliter nec exacte transverse positis; 3 — 4-gonum 

 (S. bijidum Eiik. f. 11, I. c; Meteor]), t. I, f. 14? non auet.). 



Long. 40—44, lat. 54—58, lat. isth. 12 ,//; 4-gonum lat. 40 //. T. XV, f. 8 

 (c, oblique view); XVI, f. 37, f. tetragonum. 



Not uncommon in the Bengal gathering (Wallich Mscr. No. 240, f. 1, 2). Ra- 

 neegunge, Oct.-Xov. 1855, G. C. W. 



Stau. diptilum Nordst. (Desm. Brås. p. 227, t. IV, f. 56) is so near to the In- 

 dian form of this species that it raight be called var. diptilum. I have a verv curious 

 form of this species, from the Himalayas, ex Utricularia stellari, communicated by 

 Lagerheim; it differs from the type in having the bifid prolongations of the angles 

 incurved and recurved (like horns of oxen) it is of normal size. It might stånd as 

 /'. uncinata. 



22. S. trifidum Nordst. (Desm. Brås. p. 226, t. IV, f. 51, 1N6!>). Forma reversa, n. f. 

 In ieone Nordstedtii loc. c-it. aculei 1 superior et 2 inferiores positi, sed inf. reversa 

 aculei 2, 1, positi sunt. 



Long. 38, lat. 52 (incl. sp.), lat. isth. 12, long. spin. 8 — 'J u (also in Wallich 

 Mscr. Xo. 243). 



Raneegunge, rare. Xov. 1855, G. G \Y. 



The same peculiar reversion of the spines oeeurs in a related species S. tritur- 

 catum. T. XVII, f. 9, <p v. 



23. S. paténs, n. sp. S. mediocre, paullo latins quam longum, bi-cunetatuni; semicellulu' 

 cuneatae, basi inflatae; latere sinuatae, angulis .'» brevibus produetis bi-aculeatis; aculeis 



