856 THE FRESHWATER ALGE OF MAINE. 
— Var. ENopton, nov. var. Semicellule a fronte vise quam forma 
typica ; a vertice vise trigone, lateribus leviter concavis, aculeis 
binis subconvergentibus ordinatis, uno utrumque terminum versus 
posito. Long. 27 «; lat. 48°5-47 p; lat. isthm. 15 yp. Fig. 1b. 
Scarbro’.—S. incisuwm Wolle. forma 6-gona. Searbro’ , very frequ 
S. Sebaldi Reinsch var. ornatum Nord., and S. iotanum Wolle. Scar- 
bro’. — S. tetracerum Ralfs. Sloachro’, abundant; between Orono 
and Bangor. 
Salk dstruun Bibraianum Reinsch. Scarbro 
Polyedrium —— ~Br. (P. Pinacidiun nice, and P. 
gigas Wittr. Sc 
goatee crassa Witte. in Nord. et Wittr. Alg. Easic. no. 855. 
b 
Osecillaria major Veoh Lat, trichom. 22-23°5 ». Scarbro’. 
Surirella 9st (Ehrnb.) Kitz. Gorham 
tula Khrnb, 
Car otancis': Arcus (Khrnb.) Kitz. Orono. 
Cymbella turgidula A. Schm. Orono. 
Cocconema parvum Sm. _ Orono 
Fragilaria capucina Desmaz. Walker" s Frog 2 A ase 
Diatoma elongatum Ag. and D. anceps Ehrnb, 
Synedra biceps Kiitz. an Orono and Bangor. 
Nitzschia linearis (Ag.) Sm. and N. coiistriehel (Kiitz.) Pritch. 
(N. dubia Sm.). Gorham 
. Navieula a Ae Ehrnb, and N, poe Kiitz. Scarbro’. — 
ve Senay Ehrnb, Beene : hime Orono and Bangor.—N. 
Ralfs (NV. obtusa Sm.). Orono.—.. trinodis Sm. (Achnanthidium 
pauls Arnott), forma crassior. © idee. 20 »; lat. 8 ». Orono. — 
N. Carassius sta oa —N, — hus Ebrnb. + NV. oe 
—iobly i Bhnb. rs — N. nensis Ralfs and N. 
Hiteheockii Ehrub. 
Ee Daca radiosa 2 kat) Rabh., P. viridula (Kiitz.), Rabh., 
and P. Dactylus Ehrnb. Orono. Re polyonca (Bréb.) Sm. Sear- 
bro’. — P. — Sm., P. globiceps Greg., and P. Digitus Ehrnb. 
3 a Beavrencie gracilis Ebrnb, and S. inflata Kitz. Oron 
ma k dichotouem Kitz. Orono, — G, Secanue Kiitz. 
Searbro’; Oron 
Tabellaria yaad (Lyngb.) Kiitz, Between Orono and Bangor. 
Fig. EXPLANATION OF ae 315. 
- 2 Seger TE, m™ in aca’ x 400; a’ 25. 
Si position ‘of conneotng glands in 
ax 100; a’ x . {another specimen. 
Central portion x 625. _ 
