1905] Cushman, Desmid Flora of New Hampshire 263 
ding Pond, North Conway! This was the typical form, that called 
by Lagerheim 6 + 4 radiata. 
S. LEPTOCLADUM Nordst. Length with processes 74-80 p, without 
30 p: breadth with processes 96-112 p: isthmus 11 pw. Pudding 
Pond, North Conway ! 
S. Lewisi Wood. Breadth with processes 62 p: without 34 p: 
isthmus 5.5-6 ». Pudding Pond, North Conway (H. C. no. 136)! 
Saco Lake (Wood). This has the basal spines, the absence of which 
seems to be the only difference between it and S. aristiferum Ralfs. 
var. parallelum W. &. G. S. West. 
* S. LONGIRADIATUM W. & G. S. West, forma MAJOR W. &. G. S. 
West. Length with processes 62-68 p, without 31 4: breadth with 
processes 80—90 4, isthmus 1o a. Pudding Pond, North Conway 
(H. C. no. 151)! This had more curved processes than the speci- 
men figured by the authors but was in essential points the same. It 
had the three spines at the end of the processes which is character- 
istic of the form. This again gives a definite locality for a species 
described simply as North American. 
* S. LoNGISPINUM (Bail) Arch., var. bidentatum (Wittr.) n. 
comb. (Plate 64, fig. 13.) (S. bidentatum Wittr.) Length 103 p: 
breadth with spines 125-155 p, without 90-92 p: isthmus 33 p: 
length of spine 29 q. Squam Lake! Pudding Pond, North Con- 
way, occasional! The form with two spines at each angle and these 
short and fairly stout instead of long as in the typical. 
* S. LUNATUM Ralfs. Length with spines 40 p, without 30 p: 
breadth with spines 40-44 p, without 28-32 mw: isthmus 6.5 u. Pud- 
ding Pond, North Conway ! 
S. MACROCERUM Wolle. Length 58 p: breadth with processes 
125-127 p: without 22-25 mw: isthmus rs p. Pudding Pond, 
North Conway, frequent! 
S. MEGACANTHUM Lund. Length 46 a: breadth with spines 83 p. 
Pudding Pond, North Conway ! 
S. MEGALONOTUM Nordst. Length with spines 48 q: breadth with 
spines 40 p: isthmus 12.5 4. Pudding Pond, North Conway (H. C. 
no. 131)! 
Forma oBrUsuM Hast. Rochester (Hastings). 
* S. MINUTISSIMUM Reinsch., var. CONSTRICTUM West. Length 24 
p: breadth 24 p: isthmus 9 q. Squam Lake! 
S. MUTICUM Bréb. Length 36 »: breadth 36 p. Squam Lake! 
