WELWXTSCh's AFRICAN FRESHWATER ALG.E. 115 



minuto ad angulum uaumquemque. Long. 09 /^ ; lat. 96/^; lat. 

 istlim. 20 [X ; crass. 40 /x. 



Huilla. Inter Utriculariam, Morro de Lopollo ; April 1860. 

 No. 179. 



Compare with C. Baileyi v. major West & G. S. West (in Trans. 

 Linn. Soc. 2nd Ser. v. 246, t. xiv. f. 36). 



10. C. PYRAMiDATUM Breb. in Ralfs, Brit. Desm. 94, t. xv. f. 4 

 a, h, c (1848). Long. 96 /* ; lat. 55 /x ; lat. istlim. 20 //. 



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

 inter Utriculariam, Morro de Lopollo ; April 1860. No. 179. 



Forma tropica. Forma multe major et longior, apice minus 

 truncato. Long. 165-170 /x; lat. 86-90 jx ; lat. isthm. 29-31 yu. 



Huilla. Cum typ. ; Nos. 176 and 179. 



Var. PARALLELUM, var. n. Var. semicellulis angustioribus, an- 

 gulis basalibus rectangularibus et leviter submamillatis, lateribus 

 subparallelis, apicibus late rotundatis ; membrana densissime scro- 

 biculata. Long. 127 /x ; lat. 55 /x; lat. isthm. 19 /x. 



Huilla. In editis de Morro de Lopollo ; Febr. 1860. No. 192. 



11. C. PSEUDOPYRAMiDATUM Luud. in Nova Acta r. Soc. Sclent. 

 Ups. ser. 3, vol. viii. no. ii. 41, t. ii. f. 18 (1871). Long. 43 /x ; lat. 

 24 fx; lat. isthm. 7 /x. 



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



12. C. ligoniforme, sp. n. (tab. 367, fig. 12). C. submediocre, 

 circiter If-plo longius quam latius, profunde constrictum, sinu 

 linear! ; semicellulfe semiellipticfe, ad apicem depressfe, angulis 

 basalibus subrectangularibus, leviter rotundatis et levissime pro- 

 ductis; a vertice et latere visoe ellipticne; membrana dense punctata. 



ZygosporfB globosae, elevationibus mamillatis, spina supra eleva- 

 tionem unamquemque obsessfe. Long. 57*5-59'5 /x; lat. 37 /x; 

 lat. isthm. 14-5-16 //.; crass. 19 /x; diam. zygosp. sine spin. 47-52 [x, 

 cum. spin. 59-61 /x. 



Huilla. In uliginosis editioribus prope Humpata, Empalanca 

 et Lopollo ; May 1860. No. 15 (freq, c. zygosp.). Morro de Lo- 

 pollo; April 1860. No. 182. 



This species closely resembles some forms of C. pseudopyramidatum. 

 Lund., but is comparatively broader with wider apices, has different 

 basal angles, and the zygospore is very different. 



13. C. VARioLATUM Lund. I.e. 41, t. ii. f. 19 (1871). 



{a.) Forma scrobiculis numerosioribus. Long. 31-34-5 /x ; lat. 

 17-19 /x; lat. isthm. 5-5-5 /x; crass. 11-13 /x. 



Huilla. In uliginosis editioribus prope Humpata, Empalanca 

 et Lopollo ; May 1860. No. 15. 



Golungo Alto. Inter Scytonema Arcamjelii ad muscos prope 

 fontem magn. ad Banca do Soba Bango; Sept. 1855. No. 159. 



{b.) Forma semicellulis latioribus. Long. 34-5 /x ; lat. 22 /x ; 

 lat. isthm. 7-5 /x. 



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



14. C. africanum, sp. n. (tab. 368, fig. 1). C. subparvum, 

 l|-plo longius quam latius, profunde constrictum, sinu linear! ; 



I 2 



