258 Rhodora [DECEMBER 
C. ErLoiskANUM Wolle. Length 105 p: breadth 72 u: isthmus 
34 p. Laconia, scarce ( Wests, H. J. no. 641)! 
* Var. DEPRESSUM W. & G. S. West. Length 92 4: breadth with- 
out teeth 67 u: with teeth 75 m: isthmus 22 q. A trifle larger than 
the measurements given by the authors. Pudding Pond, North 
Conway, frequent ! 
C. CAELATUM Ralfs, var.* abnormale var. nov. (Plate 64, figs. 6 
and 7). Length 38-41 B: breadth 37-38 isthmus 13-14 y. 
The ends of the semi-cells are broadly truncate with five protuber- 
ances or lobes along the border each of these with two papilla: at 
the side of each semicell is a large broadly rounded lobe as is usually 
seen in the typical species. Occasionally in the material there were 
specimens which showed the connection with the typical, but these 
were few and the variety on the other hand was abundant. North 
Woodstock (H. C. no. 187)! 
C. Brvrri Wille. Length 12 B: breadth 12 y: isthmus 3 y. 
Squam Lake! 
C. IMPRESSULUM Elfv. Length 25 4: breadth 19 4: isthmus 
3.59. Pudding Pond, North Conway ! 
C. PSEUDOPECTINOIDES Wolle. White Mountains ( Wolle). 
C. DISPERSUM Johnson. Length 40 4: breadth 40-444: isthmus 
11: thickness 20 y. Meredith (Johnson) . 
PLEUROTAENIOPSIS Lund. 
P. cucumis (Corda) Lund. (Cosmarium cucumis Wolle, '92). 
Length 59-72 mw: breadth 34-43 m: isthmus 15-17 4. Pudding 
Pond, North Conway, frequent! Saco Lake (Wood). 
P. Desaryi (Arch.) Lund. (Ca/ocy/indrus DeBaryi Wolle '92). 
Length 75 4: breadth 37 4: isthmus 25 q. Pudding Pond, North 
Conway ! 
* P. ELEGANTISSIMUM Lund. (Cosmarium elegantissimum Wolle 
'92), var. simplicius (W. & G. S. West) n. comb. Length 47 p: 
breadth 22 a: isthmus 19 . Intervale (H.C. no. 159)! The type 
of the variety was from Florida. 
P. ovaLE (Ralfs) Lund. (Cosmarium ovale Wolle '92), var. 
* Westii var. nov. The form mentioned by the Wests (96) p. 249 
as a common American form. It has a slightly subtruncate and 
