854 THE FRESHWATER ALG OF MAINE, 
Desmidium cylindricum Grey. Between Orono and Bangor. — 
D. Swartzit Ag. var. amblyodon (Itz.) ya Pass membrana 
distincte punctata. Walker’s Frog Pond, 
Closterium oe (Bory. Ehrnb. Ee we p. Gorham.— 
C. lineatum Ehrnb. 
: subengustatur, n. a Cl. diametro circiter 25-plo loa 
leve curvatum, subrectum ad medium, sensim attenuatum, apices 
cabetingatos versus ; membrana cubferruginea, costata (costis 5 in 
18 »), delicatissime punctata. Long. 780 »; lat. 31; lat. ad apic. 
This differs from C. angustatum Kiitz. in being less curved, in 
having more ribs, and in bs tend mor = ieants the ends: it differs 
from C. lineatum E in being oats and not striate, and in 
being less tapering and less curved towards the oe Com- 
pare with C. lineatum Ehrnb, var. costatwm Wo 
C, Delpontii Klebs. Scarbro’.— C. rostratum Bab. Between 
Orono and Bangor. 
Penium annular i. ©. ane eich circiter 7-plo longius 
quam tating, gaboylindriouan: medio constrictum (vel subcon- 
b 5and6. Scarbro’, abundant. This is a very distinct 
Va OBESUM, nov. var. Var. circiter 3-plo longius quam latius 
cum annulis paucioribus Meo sheng 9). Long. 106 p; lat. 31-34 p 
lat. isthm. 20-22 ». Bog between Orono and Ban gor, fraquent. — 
= Rogeenga es ) Ralfs, var. inflata pte Tong. bid st ; lat. 
; lat. isthm. 17-5 ». Scarbro’. — Var. p Var 
rig inferioribus semicellularum profunde bifidis, ‘rogue lobulo 
bidentato, membrana punctulata. Long. 61-75 p; 
lat. isthm. 17°5-20 ». Fig. 8. Bog between Orono 2 Bangor.— 
M. oe Ralfs. Long. 182-140 »; lat. 98-115 »; lat. mer 
20- Bog between = and Bangor; Scarbro’, frequ 
we Galactum Nord. Seaahent ‘ ge Paeoeent Wolle. Long. 65- 
75 »; lat. 830-34-; lat. isthm. 8-10 »; crass. 18 u. Scarbro’, 
uncommon.— FE, —— Bréb. pe ones rare. — E. elegans 
(Bréb.) Kiitz. var. bident Nag. LE. elegans (Bréb.) Kiitz. var. 
speciosum Boldt (Desm tree Gronand, p- 9, tab. as fig. 10)]. Between 
Orono and sea —E. denticulatum (Kirch, )G she Orono 
and Bangor.— E. abruptum Nord. (Desm. Brasil, tab. 2 fig. 3) var. 
evolutum Nord. ion lg Brasil. p. 21, tab. 2 2, fig. 7). Long. 60-— 
dw 3 lat. 42-50 p ; lat. isthm. 10-12°5 »; crass. 27-830 ». Scar- 
margaritum Wolle, Long. 27-30 4; lat. 23-24 »; 
