102 
WITTROCK AXD NORDSTEDt’s ALG.E . 
Closterium subtuzgidum, Nordst, 
Habitu Glost. turgidi, sed majus et prae longitudinem crassius, 
nucleis multis sparsis, membrana dilute fuscescente subtiliter 
striata, striis 6-7 in ‘Ul mm., apicibus rectis magis truncatis et 
membrana incrassata ornatis s«epe rufescentibus. 
Lat. '082 X '1 mm., long wd-'l mm., lat. apic. ’02 mm. 
In fresh water. Brazil. 
Clostexium laterale, Nord^t. v 
Leviter semilunare, lineari-lanceolatnm, diametro 8-11 pio 
longius, ventre late subtumidum, utroque polo sensim attenuatum, 
apicibus truncatis, membrana parum colorata subtilissime striata, 
striis fegre conspicuis, laminis cliloropb}dlaceis circ. 5 sublatera- 
libus nucleos amylaceos multos in quaque lamina in seriem uni- 
cam ordinatos includentibus, locello apicali granulis (circ. 10) 
repletis, 
Diam, ’OS-’OC mm,, long '4b-'b3 mm. lat., apic. circ. -008 mm. 
In river, Brazil. 
Allied to Cl. acerosum, var. subangusium (Klebs.), Cl. Ralfsii 
(Breb,), Cl. angustum (Hantsch), Cl hirudo (Delp), Cl. decorum 
( Breb.), but differing in the amylaceous granules not being unise- 
riate or central, 
Cosmazium binum, Nordst. 
Diametro quarta, 1. quinta parte longius, medio profunde con- 
strictum, sinu lineari angustissime (extremo ampliato) ; semi-cellulse 
pyramidatae apice late truncato 6-crenatae, angulis inferioribus 
rotundato-obtusis, lateribus modice convexis crenatis, crenis circ. 
10 (bigranulatis), supra isthmum tumore plus minus circulari 1. 
elliptico granulato, granulis in series circ. 7 verticales apicibus 
convergentes, dense ordinatis et infra magis sparsis vel in 2 
series horizontales positis ornatae, ad marginem versus granulatae, 
granulis radiatim et concentrice dispositis in seriebus (2-3), in- 
terioribus singulis, ceteris binis; a latere visse tumore basili ; a 
vertice oblongae medio utrinque tumidae. Latitudo isthmi latitu- 
dine apicis modo paullo minor ; nucleo amylacei bini. 
Lat. *07-* 072 mm. long -OdG-’OO mm., lat. isthm. •021-’024 
mm. 
Cosmazium quazteznazium, Nordst. 
Paulo longius quam latius, medio profund econstrictum, sinu 
lineari (interne paullum dilatato), extremo ampliato; semi- 
cellulae subtrapezic^e basi subreniformi, apice late truncatee granulis 
nullis, angulis inferioribus obtuso-rotundatis, superioribus rotun- 
datis, lateribus paullo convexis, granulato-crenatis, membrana 
granulis sub- parvis ex apice radiantibus ornata, in area magna 
centrali sub-circulari-elliptica, granulis inter se jugis connexis, 
unde scrobicLilse fiunt ; a vertice Ausse ellipticie granulis e centro 
non granulato radiantibus ; a latere circulares. Massa cliloro- 
phyllacea e laminis 4 parietalibus nucleis amylaceis singulis for- 
mata. 
