600 CUSHMAN: TETMEMORUS 
Washington! Lake Quinsigamond, Worcester (Stone) ; Tewks- 
bury (Lagerheim); Waverley (Johnson); Bridgewater! Lake 
Watuppa, Fall River! Ruope Istanp: Wainskut Pond, North 
Providence (Baz/ey). 
2, TETMEMORUS GRANULATUS (Bréb.) Ralfs 
Closterium granulatum Bréb., in Cheval. Microscop. et Usage 272. 
1839. 
Tetmemorus granulatus Ralfs, Ann. Mag. Nat. Hist. 14: 257. f/. 
@. J, 2. 1844.—~ Brit. Desm. 147. p/. 24. f. 2. pl. 33. J. 4 
1848. — Wolle, Desm. U. S. 91. pl. 50. f. 33, 34. 1884. 
Cells decidedly attenuate toward the apices in both front and 
side views, about 51% times as long as wide; apices narrowly 
rounded ; cell-wall scrobiculate in encircling lines at the base of 
the semicell, becoming irregular and more crowded toward the 
apex ; chloroplasts with 4—5 pyrenoids. 
Length 168-260 pv: breadth 34-46 w: isthmus 22-38 p. 
Maine: Orono (W. West). New Hampsuire: Pudding Pond, 
North Conway ! Intervale ! Noone’s Station ! North Woodstock ! 
Massacuuserts: Guilder Pond on Mt. Everett, Mount Wash- 
ington! Lake Quinsigamond, Worcester (Stone) ; Tewksbury 
(Lagerheim) ; Pondville! Lake Watuppa, Fall River! Wigwam 
and Almanac Ponds, Nantucket! Ruopr Istanp: Providence 
(Bailey). 
3. TETMEMoRUS LAEVis (Kiitz.) Ralfs 
Closterium laeve Kitz. Phyc. Germ. 132. 1845. 
Tetmemorus laevis Ralfs, Brit. Desm. 146. pl. 2g. f. 3. 1848. — 
Wolle, Desm. U. S. gl. pl. 20. f. 3. pl. 50. f. 35. 1884. 
Tetmemorus minutus Wolle, pl. 20. I. 7-9. 1884. 
Cells subcylindrical, about 4 times as long as wide, gradually 
attenuate to the apices, which are broadly rounded; cell-wall 
minutely punctate ; chloroplasts with 3-5 pyrenoids. 
_ Length 70-127 w: breadth 19-23 #: isthmus 17-19 /. 
Maine: Orono (W. West). Massacnusetts: Lake Quin- 
sigamond, Worcester (Stone) ; East Bridgewater ! Lake Watuppa, 
Fall River! Sandwich ! Chilmark ! Nantucket ! 
4. TETMEMoRUS miNUTUS DeBary. 
Tetmemorus minutus DeBary, Conj. 41. pl. 5. f. ro. 1858. 
Cells attenuate toward the apices in both front and side views, 
A a ee ae a ne ee ee ee 
