WELWITSCH's AFRICAN FRESHWATER ALG.E. 87 



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

 1857. No. 177. 



Var. cRAssuM, var. n. (tab. 3G6, fig. 3). Var, robustior quam 

 forma typica ; processibus brevioribus et crassioribus, deuticulis 

 obtasis 4 ad apices processuum basalum. Long. 131 ix ; lat. bas. 

 Ill //; lat. apic. 77-86 /x; lat. isthm. 20 /x. 



Huilla. Inter Utriculariam ecalcaratam, Morro de Lopollo ; 

 April 1860. No. 179. 



3. M. robasta, sp.n. (tab. 366, figs. 5, 6). M. mediocris, 

 circiter l|-plo longior quam iatior, profunde constrictum, siuu 

 aperto et semi-elliptico ad extremum acuminato ; semicellulfe tri- 

 lobas ; lobo polari magno, late expanso et extento utrobique ultra 

 lobos laterales, subincudiformi cum collo brevi crasso et parte 

 apicali subfusiformi, apice convexo serie dentium magnorum (cir- 

 citer) 12 (maximis in medio) pra^dito, margine inferiori subrecto 

 denticulis 2-3 utrobique prasdito, truncato ad extremitatem unam- 

 quamque et cum denticulis 4 ; lobis lateralibns brevibus crassisque, 

 arcuatis, margine superiori multe convexo denticulis acumiuatis 3 

 instructo, margine inferiori concavo et glabro, extremitate truncata 

 dentis parvis 3 instructa ; semicellulte serie granulorum (iiiterdum 

 geminatorum) intra marginem unumquemque colli lobi polaris, 

 serie irregnlari granulorum infra apicem et seriebus duabus irregu- 

 laribus intra lobum lateralem unumquemque, in centro granulis 

 sparsis 4-5 (nonnunquam majoribus) ; a vertice vis£e parte basali 

 late ellipticfe polls truncatis, parte apicali fusiforme-ellipticfe polls 

 truncatis. Long. 88-106 /x ; lat. bas. 57-63 /x ; lat. apic. 61-69 /x; 

 lat. isthm. 15-21 /x ; crass. 29 /x. 



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



This beautiful and characteristic species has a very robust 

 appearance on account of the shortness and thickness of the lobes ; 

 the subuncinate form of the lateral lobes is also peculiar. 



4. M. poLONicA West & G. S. West in Jouni. Bat. xxxiii. 66 

 (1895). M. Kitclielii Wolle, forma polonica B. Eichl. & Gutw. in 

 Iiospr. Akadem. Umie jet. Krakow. Wijdz. matem.-prz. Ser. ii. tom. viii. 

 vol. xxviii. 173, t. v. f. 41 (1895). Long. 46 /x ; lat. 36-5 /x ; lat. 

 apic. 21 /x ; lat. isthm. 11 /x (tab. 366, fig. 4). 



Huilla. Lopollo ; Febr. 1860. No. 192. 



The African form has a higher polar lobe than the Polish one, 

 and the infra-apical incision is a little more open. Eichler & Gut- 

 winski's measurement given in the text, "long. cell. = 86 /x," is 

 evidently a mistake, as their figure measures but 39 ji. 



5. M. CRENATA Breb. in Ralfs, Btit. Desni. 75, t. vii. f. 2 & t. x. 

 f. 4 (1848). This plant is proportionately longer than M. truncata 

 Breb. ; it has a more robust and deeper polar lobe, which is never 

 retuse in the middle, though often flattened ; it is also a very much 

 rarer species. Long. 75-83 /x ; lat. 54-58 /x ; lat. isthm. 17-19 /x. 



Huilla. In uliginosis editioribus prope Humpata, Empalanca 

 et Lopollo; May 1860. No. 15. Etiam inter (lonatoncma trnphuni 

 et Teinnix/aiiietnin heteronporuw , Morro de Lopollo ; Feb. 1860. 

 No. 172. ' 



