136 



W. B. TUHNER, ERESH-WATER ALG.F. OF EÅST INDIA. 



infiatis siiperne valde dilatatis; aculeis magnis leniter eonvergentibus apioern versus 

 recurvatis; membrana glabra; sinn parvo sub-acuto vel vix distincto. A basi visus 

 acute ellipticus. 



Lon»-. 39, lat. s. acul. 36, c acul. 76, lat. isth. 9 — 10, crass. 15, long. acul. 20 

 iu. T. XII, f. 10. 

 I». Forma minor. Fere ut supra sed minor, apud suturam parva incisura instructa. 



Long. 23, lat. s. ac. 23, c acul. 36, lat. isth. 5 — 6, long. acul. 13 ju. Fide G. 

 C. W. Mscr. No. 173 B. 



0. A. Gan^ensis, n. sp. A. magnus, depressus, s. acul. quinta parte latins quam longus, 

 sub-quadraticus; semicellulis late cuncatis, basi valde contra etis superne multo inflatis; 

 dorso trnncatis saepe leniter incurvatis angulis rotundatis; aculeis convergentibus apice 

 recurvatis non longis crassis instructis; membrana glabra? sinu valde aperto, cuneato 

 interne rotundato. A vertice visus longe ellipticus apice acutus vel lanceolatus. 



Long. circ. 51, lat. s. ac. 60—62, c. acul. 90—94, lat. isth. 15—16, crass 23, 

 1. acul. 15-16 fi. T. XII, f. 14; XI, f. 38. 



These two species (8 and 9) form eonnecting-links between the ovate forms, as 

 A. convergens, and the distinctly triangulär ones, as A. triangularis, Lagkrh. 



10. A. incus (Breb.) Hans. (Br. Fr. Alg. p. 357, t. 85, f. 10, 1845; Ralls Br. Desm. p. 

 118, t. XX, f. 4; Cosmarium incus, Bréb. fide Mengh.; Staurastrum incus, Mengh. 

 Synops. p. 228, 1840; Ralfs in Aunals vol. XV, p. 158, t. XII, f. 2; Euastrum retu- 

 sum, Kutz. Phyc. Germ. p. 135, sec. Ralfs; Staurastrum pseudineus, Reinsch Spec. 

 Alg. Fung. p. 123, t. XXIV, C II 1866?). Forma-: 



a. Forma Ralfs f. 4 b. 



Long. 24, [at. s. ac. 16, c. acul. 28, lat. isth. 6, long. acul. 6 ,«. Fig. nostr. 6 a. 

 1). Forma Ralfs, f. 4 g. 



Long. 24, lat. s. ac. 20, c. acul. 38, lat. isth. 7, long. acul. 9 /u. Fig. nostr. 6 b. 

 c. Forma, Reinsch 1. c, f. 3, accedente, sed paullo major. »Forma Reinschii» Nob. 



Long. 15, lat. s. ac. 20, c. ac. 34, lat. isth. 8, long. acul. 7 ,m. Fig. nostr. 6 c 

 T. XII, f. 6. 



All from Northern India. 



11. A. spicatus, n. sp. A submediocris; magis latior quam longus, ovalis; semicellulis 

 ellipticis, apice et e basi aequaliter convexis, lateribus in processus curvatos paullo con- 

 vergentes acutos productis; membrana glabra; sinn pyriformi, interne acuto rotundato. 

 A latere visus biglobatus; a vertice visus acuto-ellipticus. Corpora amylacea bina in 

 quaque semicellula. 



Long. 30, lat. c. proc. 35 — 40, lat. isth. 10, crass. 16, long. proc. 5 u, sec, G. 

 C, W. T. XIX, f. 12 X 400, after Wallich Mscr. No. 177. 



12. A. phimus, n. sp. A. minor; semicellulis cuneatis, dorso incurvatis, latere e basi in- 

 flatis medio paullo convexis, angulis superioribus protentis acutis aculeis parvis imi- 

 nitis; membrana glabra; incisura mediana rectangula interne rotundata. In habitu 

 generali phimiformis, ex quo nomen specifieum. A latere visus angusto-ovaKs centro 

 paullo incavatus. 





