f 



STAURASTRCM. 



tin 



It sirould also be compared with typical 



Umneticum 



by the different form of th. iafau. ZTZ ,« ( '' ^ fcom Which * » *• 



*»*». T„ a K—^__ .; mCe " 8 ' " nd ^ the M"** »»hu« of the more ele-ntl, 



elt antly 



curved processes. In St. limnetic the process are ..17 T ^ n ""'* ' 



numerous dentieulations on their lower sur Zl u • °\ " PPW 8UrfMee ' bu ' » > ""« 



consist of three or four definite nd dTstW 7' 7 ," ^ ^ i? " r " M " M ' ' *»*">*«■ 



apices of the processes are also Ztd tSTft^T L^spt" ™ * ^ *» ** 



Compare also with «. *,» ri ;„, w Schmidle var . ^^^ 



K ' 7 \ T. Tanet f ° f S ° hmidle ' 8 ■»"» * ,bta '™ 4 *™» 'he plankton of LL wJLn 

 New Zealand. Thrs vanety approaches very cicely the var. B,,^. Tne ,„ ' ^ ^T 



in the more elevated apices of the semicells, and in the fewer and iJ. vT 7, TU 

 dentieulations on the processes. In specimens of var „ I I JZL™ "f ''T" "T 



Victoria Nyanza 



var. aculeatum recently examined from the 



on the process 



var. Burmense and were to a certain extent irregularly scattered. 



more numerous than in 



159. Staukastb™ t^phorum W. & G. & Westj FresllW) A , c , , 



iyi, t. J^, i. 23-25. 

 Forma Burmense. (PI. xv, fig. 28). 



Forma processibus magnis longioribus, processibus parvis profunde bifurcatis 

 formatis) ad basin semicellularum miuoribus. 



Long. 62/*; lat. cum proc. 115-123/t; lat. isthm. 7ft. 

 Hal. — In the Kan-gyi at Mudon (No. 24505). 



160. Staurastrum distentum Wolle, 1882; Desm. U. S. 1884, p. 149 t . 41 



f. 15, 16 (figures erroneous); W. & G. S. West, Some Desm. U. S. \s%% 

 p. 316, fig. xylogr. U-f (p. 315). 



Long. 23-24,*; lat. 32-35/*. 



Hal. — Mansang, near Hsipaw (No. 24193). 



The forms observed from Burma possessed rather stouter processes, and the three small spin 

 at their apices were a little more divergent. 



The Desmid recently described from Brazil by Borge as St. mbpolymorphum (Borge, Alg. ertt 



Regnell. Exped., ii. Desmid. 1903, p. 107, t. 4, f. 13) is a very close ally of St. distentum 



Wolle ; in fact it can scarcely be separated from it. Another very closely allied 



Schmidle (Ost-Afrika Desmid. 1898, p. 56, t. 4, f. 13). 



species is St. Engh 



161. Staurastrum quadricornutdm Roy & Bias. Jap. Desm. 1886, p. 240, t. 268, 



f. 4. 

 Long, sine proc. 17^, cum proc. 31/*; lat. sine proc. 15/*, cum proc. 30m; la;. 



isthm. 6*5/* 



Hal. — Mansang, near Hsipaw (No. 24193). 



162. Staurastrum Hantzschti Reinsch, 1867. 



Var. congruum (Racib.) W. & G, S. West, Some N. Amer. Desm. 1806, 



p. 257, t. 16, f. 15. . 

 St. Renardi Reinsch var. congruum Racib., 1889. 

 St. Hanizschu var. depauperatum Gutw., 1892. 

 St. intricatum Delp. (in parte). 





Akn. Roy. Bot. Gard. Calcutta Vol. VI. 





