HO \V. H. TITRNER, FRESH-WATER AI.o.K OF KANT INDIA. 



Closteria (evidently copied from Ehrenbergs Infusionstihierchen'), nearljy all the re- 

 maining Desmids are figured (vithout acknowledgement) fro'm the plates by Halfs in 

 Annals N. H., and Träns. Bot. Soc. Edin. ; even Ralfs' errors are reproduced!] 



23. E. siiiuosuni, Lenormand (in Herb. 1845, see. Ralfs Br. Desm. p. 85; E. circulare, 

 Hass. Br. Fr. Alg. p. 383, t. XC, f. 5, 1845, figura vitiosa!). 



Long. 68, lat. 41, lat. isth. 14 ,«. 



This, as Lundell aptly observes, includes the E. circulare of Hansall, whose 

 figure is only E. sinuosum very badly drawn! and which could be nothing else (if it 

 did exist) than a torra of E. ansatum, Focke. 



Northern India. 



24. E. cymatium, n. sp. E. minus, fere duplo longius quam latuni, truncato-ellipticum; 

 semicellula' truncato-pyramidatae, lateribus sub-profunde 3 — 4 undulatse; angulis basa- 

 libus rotundatis, apicalibus paullo dilatis, conico-rostratis; apicibus truneatis, cuneate 

 incisis; sinn lineari, angusto, extrorsum parum ampliato; membrana glabra, Inter E. 

 rostratum, Ralfs et E. inerme, Lundell. 



Long. 42, lat. 23, lat. isth. 8 ,«. T. X, f. 49. 



I have only seen one specimen of this plant, on a micro-slide mounted by Dr. 

 Wallich, from Bengal collection. I believe it is the E. rostratum var. fi of Wallich, 

 Beng. Desm. p. 283. 



25. E. levatum, n. sp. E. parvum, circ. l^^-plo longius quam latum, sub-ellipticum ; semi- 

 cellula? cuneatae, angulis totis rotundatae, lateribus leniter sinuatse; apicibus fissis, in- 

 cisura acuta; angulis basalibus apud sinum unusquisque dente minuto dejecto munitum; 

 sinn angusto, sub-lineari, parum aperto; membrana lajvi. 



Long. 31, lat. 21, lat. isth. 6 «. T. X, f. 48. 



E. inermi, Lund. (Desm. Suec. p. 20, t. Il, f. 3; = E. elegans fi inmur, Ralfs, 

 Br. Desm. p. 89, t. XIV, f. 7 e) proximum. 



26. E. annulatom, n. sp. E. minus, circ. duplo longius quam latum, sub-quadratum; vix 

 lobatum, fere simplex; apicibus protento-rotundatis, centro late fissis, utroque tine cor- 

 nutis; lateribus e basi rotundatis, supra incurvatis; sinu acuto, externe ampliato; mem- 

 brana glabra, sed centro semicellularum annulo granulorum ornata. A latere visum 

 parum constrictum; semicellula» basi ovatae, supra attenuato-incurvata", apice truncatae. 



Long. 36, lat. 19, lat, isth. 8, crass. 13 ,u. T. X, f. 36, 52. 



Also Wallich Mscr. No. 199. 



Nearest to E. elegans, Bréb. (Cos. elegans, Bréb. in Mengh. Synops. p. 222 1840; 

 E. elegans, Krz. Phyc. Germ. p. 135, 1845) smaller forms with rounded basal lobes; 

 and Ej. binole, forma />., Lund. (Desm. Suec. p. 23), vide No. 28 infra. 



27. E. dentiferum, n. sp. E. minus, circ. tertia parte longius quam latum, quadraticum; 

 semicellula' quadratae, angulis superioribus quaque latere bidentatse, infra contractae; 

 angulis basalibus rotundata\ incisa»; apud incisuram basalem utroque latere dente acuto 

 praeditae; apicibus truneatis, triangulariter incisis; membrana glabra, sed tumoribus 6 

 lateralibus praedita, et centro tumöre tum annulo parvo granulorum ornata; sinu line- 

 ari, angustissimo. 



Long. 21, lat. 16, lat. isth. 5 ,«. T. X, f. 38. 



