WELWlTaCIl's AFRICAN FRESHWATER ALG^. 117 



brana punctata. Long. 34-5-42 /x ; lat. 28-33 // ; hit. isthm. 

 14-5-19 /x; crass. 18-2i //. 



Pungo Andongo. Inter Scytonema myochrous v. chorogmphicum 

 et Dichotrichem qypsopliilam ad latera boreal, et occid. de Pedra 

 Songue ; April 1857. No. 12. 



Huilla. Inter Forphyrosiphonem Notarisii prope lacum Ivantala; 

 March 1860. No. 17. 



In outline this species calls to mind C. rectcnujularc Grun. 1868 

 (= C'. Gotlandicum Wittr. 1872), but the more angular semicells, 

 the much broader isthmus, and the plications present on the upper 

 half of the semicells, at once distinguish it. 



20. C. PSEUDOPROTUBERANs Kirchn. in Cohn, Kryptng.-jioia von 

 Schlesien Ziveit. Bel. 150 (1878); Nordst. in Off. K.Vet.-Akad. 

 Fork. no. 3, 8, t. vii. f. 3 (1885). A small form agreeing with var. 

 pyymaum Gutw. [Flora f/lonow oJwUg Licoica, 54, t. ii. f. 9) in 

 dimensions, but of the same form as the type. Long. 14-5 p- ; lat. 

 11-5 /x ; lat. isthm. 5 /x. 



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



21. C. POLYGONUM (Nag.) Arch, in Pritch. In/us. 732 (1861). 

 Euastnim polyyonuiii Nag. Gait. Einz. Ahj. 120, t. 7a, f. 9 (1849). 



Var. EXILE, var. n. Var. minor, a vertice visfe sine tumore 

 central!. Long. 9-5 p; lat. 9 /v.; lat. isthm. 3.8 /x; crass. 4-4 p.. 



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

 1857. No. 177. 



Compare with C. polyyonuni v. viinus Hieronymus. 



22. C. ELLiPsoiDEUM Elfv. in Acta Sac. Fauna et Flora Fenn. ii. 

 no. 2, 13, t. i. f. 10 (1881). 



Var. MINOR Racib. in Pamietnik Akad. Uiniej. w Krakoivie, Wydz. 

 Matem.-jn-z. x. (84), t. x. f. 9 (1885). C. proleiforme W. B. Turn, in 

 K. Sv. Vet.-Akad. Handl. Bd. xxv. no. 5, 64, t. ix. f. 26 (1892). 

 Long. 28 p\ lat. 23 // ; lat. isthm. 6 /x ; crass. 14 //. 



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

 1857. No. 177. 



23. C. submamilliferum, sp, n. (tab. 368, fig. 8). C. parvum, 

 tam lougum quam latum, profunde constrictum, sinu lineari; semi- 

 cellulffi brevissime truncato-pyramidatre, augulis iuferioribus et 

 superioribus rotundatis, lateribus leviter convexis, granulis duobus 

 juxta sed intra marginem ad medium apicis latissimi ; a vertice 

 visae elliptici© granulis duobus ad medium utrobique ; a latere visa? 

 subglobosfe granulo prope apicem utrobique ; membrana glabra. 

 Long. 23 //; lat. 21 p; lat. isthm. 8 /a; crass. 11-5 p. , 



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

 1857. No. 177, 



This is distinguished from G. mamilUfenim Nordst. in Yidensk. 

 Medd. Naturh. Furen. Kjoben, 1869, no. 14-15, 212, t. iii. f. 22 (1870) 

 by the very different form of the semicells in front view. 



24. C. meteoronotum, sp. u. (tab. 367, fig. 18). C. mediocre, 

 1^-plo longius quam latius, profunde constrictum, sinu lineari ; 

 semicellulie ineequaliter hexagons, marginibus superioribus laterali- 

 bus longioribus quam inferioribus, apicibus levissime convexia et 



