1905] Cushman, Desmid Flora of New Hampshire 261 
without 34-36 p: breadth with spines 75-77 m, Without 36-43 m: 
isthmus 7-8 p: length of spine 25-27 p.. Spines shorter than the 
typical form. Pudding Pond, North Conway ! 
*Var. RaLrsir W. & G. S. West. Length 25 4: breadth with 
spines 59 p, without 19 4: isthmus 6.2 p. Pudding Pond, North 
Conway (H. C. no. 164)! Squam Lake! 
A. OCTOCORNIS Ehrenb. Length with spines 46 q, without 14 p: 
breadth with spines 44 p, without 22 u : isthmus 6 u. Pudding Pond, 
North Conway ! 
* Forma MINOR Jacobs. Length with spines 21 m, without 14 p: 
breadth with spines 18 q: isthmus 3 q. Intervale! Var. new to U.S. 
A. TRIANGULARIS Lagerh., var. INFLATUS W. & G. S. West. Length 
38-40 u: breadth with spines 68-72 m: without 21-25 mw: isthmus 
6.5-7 p. Pudding Pond, North Conway, frequent! Laconia 
( Wests, H. J. no. 659). 
STAURASTRUM Meyen. 
S. ANCHORA W. & G.. S. West. Length 76 mw: breadth 140 y. 
Laconia, (Wests, H. J. no. 657). 
S. ARACHNE Ralfs. Length 42 p: breadth with processes 52 pu: 
isthmus 16 p. Noone’s Station! Saco Lake (Wood). 
S. ARCTISCON (Ehrenb.) Lund. (S. munitum Wood.) Length 
with processes 150-155 p, without 72-96 p : breadth with spines 142— 
160 u, without 62-68 p: isthmus 31-33. Wolle’s figures of this 
species are not at all good. The figures of Wood are much more 
nearly correct. In their paper “On Some North American Desmid- 
ieae” (Trans. Linn. Soc. Lond. Ser. II. (Bot.) vol. v. pt. 5, p. 269) 
the Wests give the following : ** All American examples we have seen 
of this species have shorter processes than the European ones, and 
they have at most but three rings of small teeth on each process.” 
While this has been found true in Massachusetts specimens and 
some of those from New Hampshire it does not always hold true. 
The specimens from Pudding Pond, North Conway have long proc- 
esses which are bifurcate at the apices as figured by Wood and have 
six or more rings of teeth on each process. Pudding Pond, North 
Conway! Squam Lake! Meredith, Holderness ( Wests). 
*S. ARCUATUM Nordst., forma ACICULIFERA W. &. G. S. West. 
Length with processes 26-27 p, without 19 p: breadth with proc- 
