102 W, B. TURNER, FRESH-WATER ALG.E OF EAST INDIA. 



13. X. pulchrum, n. sp. X. mediocre, eosmariiforme, tam longum quain latum, sub- 

 circulare; semicellulae ovales, lateribus in superiorem partem quoqué latere aculeis bre- 

 vibus erassis 3, et basin versus aculeis eonsimilibus circ. 10 irregulariter positis (ad 

 marginen! ), armatae; superficie punctata, centrali parte juxta isthmum glabra, et supra 

 isthmum stigmatibus vel scrobiculis parvis 12 — 14 transverse dispositis ornata; sinu 

 aperto, cuneato, interne rotundato. Tumör ventralis nullus. A vertice visum ovato- 

 ellipticum. 



Long. 56, lat, 54 sp. incl. lat. isth. 25, crass. 28, 1. spin. 3—4 ju. T. XIII, f. 10. 

 Central India. 



14. X. eximium, n. sp. X. mediocre, paullo longius quam latius, sub-circulare; semi- 

 cellula ovata, aculeis brevibus erassis (in quäqUe semicellula circ. 10) marginalibus et 

 inträ margines serie aculeorum consimili armatae; membrana punctata; sinu brevi 

 aperto, interne rotundato. A latere visum bi-globulatum, aculeos in series verticales 

 3 habens. 



Long. 56, lat. 50 sp. inclus., lat. isth. 26, crass. 30, long. acul. 3 ju. T. XIII, 

 f. 12; XXII, f. 10.» 

 Central India. 



15. X. Raneegungense, n. sp. X. sub-magnum, tam longum quam latum, sub-circulare; 

 semicellula> ovales vel ellipticae, margine et marginem versus aculeatse; aculeis conico- 

 acutis erassis magnitudine irregularibus et irregulariter positis; tumör ventralis nullus; 

 reliqua membrana glabra; sinu profundo, lineari, angusto, extrorsum ampliato. A ver- 

 tice visum ellipticum. Quaque semicellula corpusculis amylaceis duobus instrueta. 



Long. 62, lat, 60 (sp. incl.); lat, isth. 12, crass. 32, 1. spin. 6-10 /u. T. XIII, 

 f. 11 (also in Wallich Mscr. No. 127). 

 Central India; Bengal. 



16. X. torquatum, n. sp. X. mediocre, circ. quinta parte longius quam latum, fere circu- 

 lare, cosmariiforme; semicellula^ sub-semieirculares, angulis basalibus rotundataj, mar- 

 gines versus gemmulis verrucosis ordinibus 2 positis ornata* (unica a f rönte visa), et 

 margine inter ordines gemmulorum aculeis brevibus erassis 4 armata; sinu angusto, 

 profundo, extrorsum parum ampliato. Quaque semicellula in centro tumöre gran u lat o 

 circulari instrueta, reliqua membrana glabra. A vertice visum latera tumida, apices 

 truncatae recta3. 



Long. 55, lat, 45, lat, isth. 10, crass. 25, long spin. 5 ^. T. XXII, f. 8. 

 Northern India, 



17. X. armatum, Breb. (Ehrb. Berl. Monatsber. 1840, as Zygoxantliium echinus; Iutz, Sp. 

 Alg. p. 178; X. echinus Ehrb. Berl. Nat, Gesellsch. 18 rlune 1839, tide Kutz, 1. c. [sp. 

 ined.?]; Heterocarpella avmåla Breb. in Chev. Micr. p. 272, 1839, nomen solum!; 

 Cosmariitm armatum Breb. in litt, c. ic, fide Mengh. 1839; Mengh. Synops. p. 218, 

 1840; Euastrum armatum Kutz. Phyc. Germ. ]>. 137: X. furcatum Rai.fn Annals N. 

 H. vol. XI Y, ]>. 466, t, XII, f. 1, non Ehrb.; X. annat a m, Breb. in Ralfs Br. Desm. 

 p. 112, t, XVIII, a — g). Var. incongruum, n. v. Margine 14 (non 12 ut in a) spi- 

 nas, et circiter scrobiculum centralem 4 consimiles breves, tissas habens; spinis (vel 



