58 W. B. TDRNER, FRESH-WATER ALd.E OF KAST INDIA. 



54. C. melanosporum? Archeb (Mscr.) forma orientalis, n. t. 



Long. et lat. L3.5, lat. isth. 5—6 /u. T. VIII, f. 43. 



Mr. J. Roy kindly informs me that this is very near to Mr. Archers spe- 

 cies, which it is proposed to publish in the Scottish Desmidieae by Messrs. Rov and 

 Bisset. 



55. C. erosura, Archer (Mscr.) aon Delp. forma minor. 



Long. 11, lat. 10, lat. isth. 2.5 ,«. T. VIII, f. 44. 



Also an unpublished species of Archer. Cfr remarks sub No. 54. I have a fig. 

 of Archers species, communicated by Mr. J. Bisset. As the name C, erosum has been 

 otherwise appropriated, I trust Mr. Archer will re-name his Irish plant. 

 50. C. pseudocoronatum, n. sp. C. raediocre, paullo latius quam longura, depresso-quadra- 

 tieum; semicellulaa depresso-quadräticse, angulis basalibus parum rotundatae, angulis 

 superioribus rotundatae, dorso leviter truncato-rotundatae; basi ad apicera seriebus gem- 

 mulis conicis concentricis 6 ornatae; cum pyrenoidibus 2 in quaque semicellula; mem- 

 brana aehroa; sinn lineari, angusto, externe parum ampliato. A vertice ovale, non 

 tumidum; a latere ovatum, modice constrictum, apice truncato-rotundatum. 



Long. 46, lat, 48, lat. isth. 18 [*. T. VIII, f. 45. 



The nearest species to this is C. coronatum, Cke. et Wills (in Grevillea, IX, p. 

 90, 1880; Wills, Desin. N. Wales, in Mid. Nat. IV, 1881, p. 74, t. V, f. 2), from 

 which it differs in the superior angles being rounded, not sub-acute, and in having 

 6 rows, not 4, of granules; the Welsh species is also l l / 2 times larger. 



57. C. insigne, n. sp. C. magnum, octa parte longius quam latius, depresso-biglobatum; 

 semicelluhe depresso-rotundatae, dorso late rotundatae, membrana verruculosa. granulis 

 magnis quincuncialiter ordinatis, et inter ea puncta minora aeque ac in quincunce po- 

 sitis, apud basin seriebus duabus granulorum (vel punctorum?), circ. 13 in quaque 

 serie; centrali parte frondis lsevi; sinu ampliato, interne rotundato, brevi. A lat. et 

 vert. non observatum. 



Long. 75, lat. 62, lat. isth. 35 /u. T. VIII, f. 46. 

 Cfr Nos. 86 et 110. 



58. C. incavatum, n. sp. C. parvuin, longum aeque ac latius, depresso-ovatum; sinu lineari, 

 profundo, extrorsum paullum ampliato; semicellula depresso-ovales, apice truncata' ii 

 crenatae; margine irregulari, basali parte rotunda, dentibus 3 ornata; parte superiore 

 lateris incavata, cum emarginatione unica bidentata; angulis superioribus singulatim 

 dentatis; superficies frondis granulosa, granulis in series 4 concentrice ordinatis; utra- 

 que semicellula tumöre verruculoso instructa. 



Long. et lat. 22, lat, isth. 6 t*. T. VIII, f. 47. 



(i planum. Planum, vel levissime tumidum, in centr. inornatum. 



Long. 22, lat, 20, lat, isth. 5 / «. T. XXII, f. 7. 



Hal», ce Lengal; />' Khasia, G. von L. legit, 



59. C. rotundum, n. sp. C. mediocre, tam longum quam latum, late ovatum; modice con- 

 strictum, sinu sub-lineari, extrorsum ampliato; semicellula' sub-semicirculares, basi ro- 

 tundatae, dorso late rotundatae paullulum depressae; ventre glabrae; membrana aehroa, 

 sub-crassa, marginem versus granulata, granulis in series regulares, concentricas, ordi- 



