64l) Mil. W. JOSHUA OK BUKMKSE DESMIDIEjE. 



divisions of lobes linear, circular at base. Length 58 /i, width 

 35 /i ; "width of isthmus 8 fx. 



E. exile, n. sp. (Plate XXIII. figs. 10, 17, & 18.) 

 E. parvum, quadratum, diametro plus duplo longius : semi- 

 cellulis 1-lobatis, constrictionibus tribus lateralibus, et promi- 

 nentia unica conica, a vertice conspectis ovatis : apicibus trun- 

 catis ; angulis polaribus spinis longis robustioribus projectis : 

 isthmo divisione lineari. Lougit. (sine spinis) 30 /u, latit. ad 

 punctum divisionis 13 /x: isthmo vix \ latitudinis. 



Small, quadrate, rather more than twice as long as broad ; 

 semicells 1-lobed, having three lateral constrictions and one 

 conical protuberance ; apex truncate ; polar angles with long, 

 rather stout spinous projections ; end view ovate ; isthmus 

 scarcely one third of width ; division linear. Length without 

 spines 30 /u ; width at point of division 13 /x. 



E. ditebgens, n. sp. (Plate XXIII. figs. 8 & 0.) 

 E. fere tam longum quam latum, centro prof unde constrictum, 

 angulo lineari valde dilatato : semicellulis profunde 3-lobatia, 

 granulis magnis, supra centri inflationem concentrice dispositis; 

 lobis lateralibus semifusiformibus, apicibus truncatis, parte supe- 

 riori granulis margaritaceis paulum elongate, seriebus vertica- 

 libus dispositis, minute ornatis ; lobo polari quadruto, truncato 

 (latitudine aequanti tertiam partem diametri transversi cellulffi). 

 Longit. 48 /u, latit. 48 /u : lobi polaris latit. 15 n : isthmi latit. 10 ft. 

 About as long as wide, in the middle deeply constiicted; 

 linear angle much w idened ; semicells deeply 3-lobed ; granules 

 large above central inflation, in concentric arrangement ; lateral 

 lobes semifusiform ; ends truncate; the upper part of lobes 

 minutely ornate with pearly granules a little elongated, placed 

 in vertical rows ; polar lobe quadrate, end truncate. Some- 

 what similar at first sight to E. hreviceps, Nord., and E. helium, 

 Nord., also E. platycerum, Eeinsch ; but differing in ehape of 

 basal lobes. Length = breadth 48 /x; width of polar lobe I5f; 

 breadth of isthmus 10 fi. 



E. obbicula be, Wallich (I c. p. 282, plate xiv. figs. 8-11). 



8. Staubastbvjm, Meyen. 

 S. bihijlm, Salfs, var. (Plate XXIV. figs. 8& 0.) 

 S. buoboscideum, Breb., f. javakica, Nordst. 

 S. mabuabitaceum, Ehrenb., var. niKTUM, JSordst. 



