WELWITSCH's AFRICAN FRESHWATER ALG.E. 183 



Pungo Aiidoiigo. lu stagnis prope Anbilla (Contlo) ; March 

 1857. No. 177. 



24. S. angolense, sp. n. (tab. 368, fig. 22). S. siibmediocre, 

 cii'citer 1^-plo longius quam latins (sine processibus), submodice 

 coustrictum ; semicelluhB late cuneatre, apicibus subrectis ct levis- 

 sime granulatis, angulis superioribus in processus divergentes 

 lougos denticulatos productis, apicibus processuum tridenticulatis, 

 pauUo supra medium cum seriebus transversis duabus granulorum 

 (in serie unaquaque 3}, serie superior! majori ; a vertice vis^e 

 anguste elliptic^, polis iu processus longos denticulatos productis, 

 cum grauulis 3 ad margiuem uuumquemque. Long, sine proc. 

 27 iJ; cum proc. 35 /x; lat. cum proc. 52 /x ; lat. isthm. 11-5 //. ; 

 crass. 11 '5 //. 



Pungo Andongo. In stagnis prope Anbilla (Coudo) ; March 

 1857. No. 177. 



The nearest species to this is S. hrachioprominens Burg, in 

 Vidensk. Medd. /. d. Natnih. Foren., Kjijben. (1890), 47, t. v. f. 52 

 (1891); West & G. S. West in Trmis. Linn. Hoc. ser. 2, v, 265, 

 t. xvii. f. 12 (1896), from which it differs in the absence of the 

 denticulate apical verrucre and the basal rings of grannies, in the 

 presence of the two transverse rows of grannies at each side, and in 

 the somewhat shorter and thicker processes. 



25. S. quadridentatum, sp. n. (tab. 369, figs. 15, 16). S. sub- 

 magnum, dnplo latins qnam longius (cum processibus), modice 

 constrictum ; semicelluhB subcyathiformes, ad basin bulbosis et 

 irregnlariter granulatis, angulis superioribus in processus longos 

 snbhorizontales rectos (vel leviter sigmoideos) cum marginibus 

 denticnlatis productis, apicibus processuum tridentatis, serie verru- 

 carum emarginatarum 7-8 (majoribus earum in medio) juxta et 

 infra apicem semicellulfe uniuscujusque, etiam verruca dentata 

 intra basin processus uniuscujusque (circiter 10 ji seorsum) ; a 

 vertice visas elliptico-fusiformes, polis iu processus longos denticu- 

 latos productis, serie verrucarum emarginatarum intra marginem 

 lateralem unumquemque, etiam verrucis dentatis duabus prope 

 medium utrobique, cum annulo dentium minorum circa dentem 

 centralem supra verrucam unamquamque, base semicellularum ob- 

 longa polis rotundatis granulatis. 



Zygosporte globos;e et mamillatre, processu delicato et leviter 

 curvato supra mamillam unamquamque, apicibus processuum pro- 

 funde bifidis, divisionibus patentibus et leviter recurvatis. Long. 

 37-42 /x; lat. cum proc. 73-84 /x; lat. isthm. 11-5-12-5 /x ; di{im. 

 zygosp. sine proc. 40 /x, cum proc. 54 /x, 



Huilla. In paludibus exsiccandis ; April 1860. No. 176. Etiam 

 inter Utricular icun, Morro dc Lopollo ; April i860. No. 179. 



(To be conlinuLcl.) 



