SÉANCE DU 25 JUILLET 1884. 337 
E. simplex. — Cell. paulo longior quam lata, rectangularis, profunde 
constricta. Semicell. rectangulares, apicem versus paulo angustiores, 
margine subtilissime denticulata, lateribus convexis, dorso truncato. 
Membrana subtilissime punctata, punctis concentrice dispositis. Long. 35, 
lat. 28, isth. 10 p. 
Environs de Montpellier. 
E. decorum. — Cell diametro longior, subcircularis, profunde con- 
strieta. Semicell. semicirculares ambitu 6-ies inciso, lobis 7 truncato- 
rotundatis margine denticulata, lobis basalibus latioribus. Membrana 
punctala, punctis in series radianles ordinatis. Long. 40, lat. 32, isth. 
13 p. 
Montagne de l'Espinouse (hautes Cévennes). 
6. In quaque semicellula chromatophori bini. 
E. transiens. — E. intermedium Fr. Gay, Mon. loc. Conj. p.63, non 
Cléve. — Cell. minima, vix longior quam lata, profunde constricta. Semi- 
cell. semicirculares, paulum depressæ, ambitu leviter undulato, angulis 
basalibus rectis vel obtusis. In quaque semicell.chromatophori bini lami- 
nis geminis constituti. Long. 17-18, lat. 14-15, isth. 5 y. 
Montagne de la Margeride. 
E. ellipticum. — Cell. maxima, elliptica, diametro duplo longior, pro- 
funde constricta. Semicell. margine crenulata, subtriangulares, dorso 
rotundato, lateribus convexis et angulis basalibus rectis. Membrana verru- 
cis regulariter ordinatis ornata. Long. 70-90, lat. 48-64, crass. 30-36, 
isth. 16-19 y. Zygosporæ armate, aculeis 3-4 dentatis; diam. sine acul. 
60 u. 
Basses Cévennes et environs de Montpellier. 
Gen. 5. STAURASTRUM (Meyen 1829) Menegh. Synops. Desmid. 1840, 
incl. gen. Arthrodesmus Ehrenberg, Infus.1838. — Staurastrum Lundell, 
De Desmid. 1871, excl. sect. Pleurenterium. 
Cell. a vertice visæ ellipticæ vel 3-6-angulares, vel radialæ, medio pro- 
funde constrictæ, sinu dilatato, semicellulis divergentibus. In quaque 
semicellula chromatophorus unicus axilis e laminis geminis, tot quot an- 
guli, radiantibus, apice convergentibus formatus, pyrenoidem unicum 
includens. Zygospor:e aculeatæ. — Sp. 15. 
S. tumidulum. — Cell. paulo longior quam lata, sinu medio acutan- 
gulo. Semicell. ellipticæ, a vertice visæ triangulares, lateribus convexis, 
angulis rectis vel obtusis, muticis. Membrana subtiliter punctata. Long. 
35, lat. 30, isth. 12 p. 
Montagne de la Margeride. 
TS XXXI. (SÉANCES) 22 
