SÉANCE DU 35 JUILLET 1884 . 
e. simplex. — Cell. paulo longior quam lata, rectangularis, profunde 
constricla. Semicell. rectangulares, apicem versus paulo angustiores, 
margine subtilissime denticulata, lateribus convexis, dorso truncato. 
Meinbrana subtilissime punctata, puuctis concentrice dispositis. Long. 35, 
lat. 2(3, isth. 10 p. 
Environs de Montpellier. 
E. décorum. — Cell. diametro longior, subcircularis, profunde con- 
stricta. Semicell. semicirculares ambitu 6-ies inciso, lobis 7 truncalo- 
rotundatis margine denticulata, lobis basalibus latioribus. Membrana 
punctata, punctis in sériés radiantes ordinatis. Long. 40, lat. 32, istli. 
13 p. 
Montagne de l’Espinouse (hautes Gévennes). 
(3. In quaque semicellula chromatophori bini. 
e. transîens. — E. intermedium Fr. Gay, Mon. loc. Conj. p. 63, non 
Elève. — Cell. minima, vix longior quam lata, profonde constricla. Semi¬ 
cell. semicirculares, paulum depressæ, ambitu leviter undulato, angulis 
basalibus rectis vel obtusis. In quaque semicell.chromatophori bini larni- 
nis geminis constituti. Long. 17-18, lat. 14-15, isth. 5 p. 
Montagne de la Margeride. 
E. eiiipticum. — Cell. maxima, elliptica, diametro duplo longior, pro¬ 
funde constricla. 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 juu Zygosporæ armatæ, aculeis 3-4 dentatis; diam. sine acul. 
60 p. 
Basses Cévennes et environs de Montpellier. 
Gen. 5. Staurastrum (Meyen 1829) Menegli. Synops. Desmid. 1840, 
incl.gen. Arthrodesmus Ehrenberg, lnfus. 1838. — Staurastrum Lundell, 
De Desmid. 1871, excl. sect. Pleurenterium. 
Cell. a verticc visæ elliplicæ vel 3-6-angulares, vel radialæ, medio pro¬ 
funde constrictæ, sinu dilatato, semicellulis divergentibus. In quaque 
semicellula chromatophorus unicus axilis c laminis geminis, lot quoi an- 
guli, radiantibus, apice convergentibus formatus, pyrenoidem unicum 
includens. Zygosporæ aculealæ. ~~ Sp. 15. 
s. tumiduium. — Cell. paulo longior quam lata, sinu medio acutau- 
gulo. Semicell. ellipticæ, a vertice visæ triangulares, lateribus convexis, 
angulis rectis vel obtusis, muticis. Membrana subtiliter punctata. Long. 
35, lat. 30, isth. 12 ^ 
Montagne de la Margeride. 
T. "XXXI. 
(séances) 22 
