114 W. B. TURNER, FRESH-WATER ALGM OF EAST INDIA. 



processu prominentiis brevibus emarginatis binis instructo. A vertice visum stellatum, 

 medio corona circulari aculeorum parvorum ornatum. 



Long. 32, lat. 38. lat. isth. 13, long. proc. 9 fi\ f. hexagona. 



T. XIII, f. 24 (also Wallich Mscr. No. 219, i. 1). 



This is much larger than the German and British planta, and in outline eom- 

 bines sorae of the features of the preceding species. The endochrome is radiate, the 

 number of rays being the same as that of the angles. It is not uncommon in Bengal- 

 [It occurs to me to note that the species named S. stellatum by Mr. F. Börgesen, 

 Desm. Brås. p. 953, t. V, f. 53, must be renamed.] 



46. S. coroiiiferum, n. sp. S. submédioere, tam longum quam latura; semicellulis fusi- 

 formibus, e basi regulariter et valde inflatis, apice verruculis parvis quadrangularibus 

 6 ornatis, apice truncata; sinu aperto, sub-rectangulo. A vertice visum 6-stellatum, 

 angulis in processus rectos crassos 6 transverse granulato-striatos productis; centrale 

 parte hexagonum, angulis rotundatis. Apicibus processuum truncatis granuliferis ve] 

 min ute mucronatis. 



Long. et lat. 40, lat. isth. 12, long. proc. 11 /a. 



T. XIII, f. 21, also in Wallich Mscr. No. 219, f. 1 a. 



This differs from S. rotida Norost. (Desm. Brås. p. 227, t. IV, f. 38) and from 

 S. coronulatum Wolle (Desm. U. S. A. p. 135, t. XLIV, f. 11, 12) in general out- 

 line, in size, and in being as broad as long. 



47. S. Willsii, n. sp. S. submédioere, paullo latins quam longum, superiore parte granu- 

 lata, apice sub-truncatum yel truncato-rotundatura; semicellulai late euncata*, angulis 

 basalibus rectis; juxta isthmum aculeis brevibus 12 (6 a fronte visis) instruetaj; an- 

 gulis 6 in processus rectos crassos protentis; processubus striato-granulatis, apice trun- 

 cato-mucronatis, ad basin verrucis binatini positis pra?ditis; sinu brevi, cuneato; mem- 

 brana in inferiorem partem semicellularum non gi-anulata, kevi. A basi visum angulis 

 interne rotundatis; a vertice centro hexagonum, angulis bi-emarginato-rotundatis, in- 

 terne verrucis parvis hexagonatim dispositis ornatum. 



Long. 38, lat. 40, lat. isth. 12, long. proc. 9 (4.. T. XIII, f. 25. 



I have seen almost exaetly the same form, but ratlier smaller (23X26 /u) in 

 England, and long ago I wrote upon it to my friend A. W. Wills, to whoni I dedi- 

 cate this, as S. margaritaceum forma. Nearest to «5, odontatam Wolle (Desm. U. S. 

 A. ]). 134, t. XLIII, f. 8) from which it differs in size and apical arrangement, though 

 agreeing in possession of basal teeth. 



48. S. gemmnlatnni, n. sj>. S. mediocre, quarta parte latius quam longum; semicelluhe 

 late cuneiformes, processubus rectis crassis granulato-striolatis 6 ad apicem cujusque 

 semicellula? instrueta 1 ; apicibus elevatis, paullo rotundatis vel sub-truncatis, duobus 

 cireulis gemmulorum ornatis; centrali parte frondis hevi, margine ci-enulate sinuato; 

 sinu brevissiino, fere rectangulo. A vertice visum sex-radiatum, angulis introrsum late 

 rotundatis; processubus apice rotundatis. 



Long. 38, lat. 46—51, lut. isth. 12—14, long. proc. 11 — 13 ,u. T. XIII, f. 26. 

 Northern India. 



