160 
granulis subirregulariter concentrice ordinatis, in cen¬ 
tro membrana pellucido-punctata (incrassata). Long. 
44—53 /t, lat. 35—41 ,t/. 
C. subpunctulatum. Semicellulæ trapezoideo-subre- 
niformes, dorso truncatæ, basi subreniformes, lateribus 
modice convexæ, angulis inferioribus obtusis, supe¬ 
rioribus obtuso-rotundatis, membrana (præcipue margi¬ 
nem versus) subtiliter granulata granulis (in margine 
laterali circ. 10, apicalibus nullis) concentrice (et radia- 
liter) vel verticaliter (ut interdum videtur) ordinatis, 
supra isthmum serie horizontali granulorum 4 ornato, 
in centro granulis nonnullis paullo majoribus (vulgo 
6 periphericis et 1 centrali vel pluribus plus minus 
regulariter dispositis). Long. 32—'34 ( tt, lat. 27—32 
( tt, crass. 17 u . 
(Cosmarium punctulatum Nordst. Desm. Spetsb. 
pag. 26 tab. 6, hg. 1 et 2 nova propria species: 
C. solidum). 
C. subspeciosum ß validius. Semicellulæ tumore ba¬ 
sali majore granulis in series (cir. 9) verticales dispo¬ 
sitis ornato, crenis lateralibus 9—10. Long. 68—84 
tf, lat. 47—53 ju. 
C. amoenum Ralfs ß mediolæve. Nullæ granulæ in 
centro semicellularum. Long. 47—66 /u , lat. 28—40 u. 
— — y intumescens. Semicellulæ paullum tu- 
midæ. Long. 85—86 t u ; lät. 51—52 tt. 
C. pseudamoenum Wille ß basilare. Membrana gra¬ 
nulata granulis in series horizontales et transversas 
(plus minus evidenter) quincuncialiter ordinatis, serie- 
bus 2 inferioribus exceptis, quæ in costas verticalas 
bigranulatas coalitæ sunt. 
C. distichum. C. cristato Ralfs proximum, margine 
laterali utrinque 6-undulato-crenato (apicali integro) 
præcipue differt. 
C. brasiliense (Wille) ß taphrosporum. Zygosporæ 
globosæ membrana scrobiculata. A forma brasiliensi, 
cujus sporæ sunt ignotæ, differt angulis inferioribus 
