1905] Cushman, Desmid Flora of New Hampshire 253 
breadth of polar lobe 26 u. North Woodstock (H. C. no. 190)! A. 
single semi-cell was all that was seen of this species and it is there- 
fore referred here with somewhat of a question. The finding of 
more material may show it to be a new species. 
* E, CIasTONI Racib. Length 44 p: breadth 26 p: isthmus 5.5 
p: breadth of polar lobe 20 q. Noone's Station (H. C. no. 394)! 
This species has been reported from Florida by the Wests. 
E. rissum W. & G. S. West. var. *Americanum var. nov. 
(Plate 64, fig. 2). Length 44 m: breadth 25 p: isthmus 4.5-6 p. 
Variety differing considerably in ornamentation from the typical hav- 
ing a rounded granule at each side of the polar incision, a ring of 
eight granules about the base of protuberance of each semi-cell and 
with double instead of single granulations at the base. Pudding 
Pond, North Conway (H. C. no. 129)! The species is new to U. 5. 
having been described from Ceylon. 
MICRASTERIAS Ag. 
M. Torrey! Bail. Length 215 4: breadth 310 mw: breadth of 
polar lobe go u: isthmus 35 4. Pudding Pond, North Conway, rare ! 
Surface slightly roughened with minute granules. 
M. RADIOsA Ag. Length 158 p: breadth 148 mw: isthmus 21 p: 
breadth of polar lobe 36 u. Pudding Pond, North Conway! 
Var. SwarNEI (Hastings) W. & G. S. West. Rochester ( Wole). 
M. ROTATA (Grev.) Ralfs. Length 242 p: breadth 226 p: isth- 
mus 27 p: breadth of polar lobe 57 4. Pudding Pond, North Con- 
way! 
M. DENTICULATA Bréb. Length 280-310 p: breadth 240-300 p : 
isthmus 30-42 p: breadth of polar lobe 65-76 m. Intervale! North 
Woodstock! Pudding Pond, North Conway! Hanover (£dwards). 
M. FIMBRIATA Ralfs. Rochester ( Wod/e). 
M. FURCATA Ag. Length 150-186 p: breadth 124-150 p: isth- 
mus 22-23 p: breadth of polar lobe 62-94 p. Noone’s Station, fre- 
quent ! 
* Var. SIMPLEX Wolle. Length 190 p: breadth 186 yq: isthmus 
18 u. Pudding Pond, North Conway! Although it has been 
conclusively shown that this variety grades into the typical form, it is 
noteworthy that in this particular instance, the two forms were dis- 
tinct in the localities given, and no traces of the other form seen in 
either case. 
