159 



enng made in a pool near the Penobscot, and which stood in the 

 laboratory two months before examination. 



F 



29. C ttcmidttm, Lund., p. 6\, Pis. XV., XVIIL— Pools 



along the Penobscot. 



From the gath- 



30. a Meneghinii, Breb., p. 65, PI. XVI 

 ering which stood in the laboratory. 



31. C, U7idtdatum, Corda., p. 6^, PI. XVI. — Pools at Old 

 Town, Great Works, etc. 



32. C. crenatum, Ralfs, p. 6^, PL XLIX. — Pools and shal- 

 low ponds along the Penobscot. 



33. C. pyrainidattmt, Breb., p. 69, PL XIV. — Pool on the 



Pool near the 



college farm. 



34- C' pachydernmm, Lund., p. 70, PI. XV. 

 Penobscot, on the college farm. 



SS^ C. Botrytis, Menegh., p. 74, PI. XIIL—Pools near Old 

 Town, Great Works and Orono. 



36. C. dentatum, Wolle, p. ^6, PI. XIII. — Pools along the 

 Penobscot, Orono. 



37. C. amoenum, Breb., p. "J^^ PL XIV. — From gathering 

 near Penobscot, which stood in laboratory for two months before 

 examination. 



38. C. sitbiobatum, Archer, p. 80, PL XVIII. — With the 

 above. 



39- C. Qiiasillus, Lund., p. 84, PL XVII.— With the above. 

 The form observed was more robust than that figured by Wolle. 



40. C. Broomei, Thwaites, p. 86, PL XVII. — Common in 

 pools and ponds, Orono. 



41. Xanthidiiim cristatwn (Breb.), Ralfs, f 

 Old well, college farm, Orono. 



42. X fasciadatum, var. subalpimim, Wolle. ^ Wolle, Fresh 

 Water Algas U. S., p. 34, PL LVI.— Old well, college farm, Orono. 



43. X, anttlopcsum (Breb.), J 

 college farm, Orono. PlentifuL 



Old well, 



44- Arthrodesmus convergens (Ehrb.), Ralfs, p. 95, PL 



XXIII. — Old well, college farm, Orono. 

 4^. Etiastrum verrucosiim CEhrb.V 



Ralfs, p. 100, PL XX VI. 



Work 



and Orono, associated with the variety mentioned below. 



