36 W. Ef. TURNJBR, ERESH-WATER ALGyE OF KAN I' INDIA. 



have t lic terminal strirc verv faint, suture not projecting, plications scarcely visible; basal 

 markings or stigmata strongly marked, and pyriform in shape. Apices ahvays truncate. 

 I was formerly of opinion that Dov. dilatatum Cleve (Bidr. p. 494, t. IV, f. 6, 

 1863) was the same as this species, but, after a careful examination of speeimens kindly 

 communicated by Dr. 0. Nordstedt, I am sure that, though nearlv allied, they cer- 

 tainly differ. The remarks of Racibo-rski (Desm. Nov. 1889, p. 3) seem to indicate 

 t hat lie is of like opinion, but he does not observe that the speeies is reallv that of 

 Bailey, as he attributes it to Richter; and Luxdell, 1. e. pp. 88 — 89, confuses the 

 plants, as under /). dilatatum he tigures D. undulatum. 



40. 1). truncatuni, Bréb. (Closterium truncatum Bréb. in Mengh. Synops. p. 235, 1840; 

 Cl. trabecula, Ehr. Infus. ex. p. (quoad tig. Il, 1) 1838; D. truncatum, Bréb. in Ralfs' 

 Br. Desm. p. 15(5, t. XXVI, f. 2, 1848; in litt. ap. Ralfs, 1846; Pleurotceniwn trun- 

 catum (sp. commixta!) Nag. Einz. Alg. p. 104, 1849; Rabii. Fl. Eur. Alg. III, p. 142, 1868). 



Forma paullo tenuior quam f. typica. 



Long. 370, lat. bas. 24, It. max. 26, apic. 19 ,</. 



Northern India. 



41. 1). parvuni, n. sp. D. minimum, forma sub-clavatum, eire. 8-plo longins quam latins; 

 basi bis inflatum; prope apices attenuatum, ad apices leviter dilatatum; apicibirs trun- 

 catis, angulis rotundatis; sutura prosiliente; membrana pallide rubido-luteola, glabra, 



Long. 130, lat. bas. et centr. 16 — 17, lat, apic. 10 ti. 



T. IV, f. 18. (Wallich, Mscr. No. 111). 



»Slightly bulging at centre of segments, and then tapered towards the extreraity, 

 which is truncate. Suture distinct, projecting. With two inflations at base of seg- 

 ments, that next the suture being the larger. Empty frond of a påle reddish-yellow 

 (•<)loiir. Endochrome in irregular bands, with large granules interspersed,» G. C. V\ . 

 — Common in Bengal. — Dr. Wallich observed the state of »swarming of the gra- 

 nules in this species, a state which precedes death in many forms. 



42. I), inornatum, n. sp. D. minutum, circ. 12 — 14-plo longius quam latum; rectum; apices 

 versus attenuatum; basi maximum; sutura non prosiliente; apicibus rotundato-truncatis; 

 inflatio basalis nulla. Membrana glabra. 



Long. 142—168, lat. 11—13, lat, apic. 6—8 //. 



T. IV, f. 20. 



Much resembling D. minutum Ralfs (Br. Desm. p. 1Ö8, t. XXVI, f. ö, 1848) 

 but rnore tumid, and attenuated slightly towards the apices, which are more abruptly 

 truncate than in Ralfs' form. 



43. D. latum, n. sp. Doc. latum, longit, mediocre; sernicelluke longe ovata;; membrana 

 pallide fusco-luteola, crassa, valde punctata; apicibus late rotundatis, emarginatis?; 

 sutura ampla, prosiliente; divisione vel conjugatione incipiente sutura fissa. Forma 

 egregia in se insignes duorum generum conjungit, apicem emarginatum Tetmemori 

 cum sutura valida Docidii! Sistit teque ac Tetmemorus latus! 



Long. 258—260, lat. max. 63—90, lat isth. 36—40, lat. sutune 44, membr. 

 crass. 2.3 — 3 ,«. 



T. VII, f. 1 (divisione incipiente?). 



