CUSHMAN: DeEsMIDS FROM NEWFOUNDLAND 583 
retusis, lobis polaribus truncatis : supra isthmum tumore instructae : 
membrana sparse scrobiculato-punctata. 
This species is very distinct. The peculiar rectangular form 
and its multilobate character will at once distinguish it. It is 
named for Dr. Glover M. Allen, who collected it. 
EvasTtRUM BINALE Ralfs. 
Long. 18 y; lat. 15 p. 
Not at all frequent : in second collection. 
EUASTRUM ELEGANS (Bréb.) Kitz., var. 
Long. 25 »; lat. 15; lat. isthm. 44. 
In the second collection, rare. 
XANTHIDIUM ARMATUM Bréb. (PLATE 26, FIG. 7.) 
Long. s. spin. 148 y; lat. s. spin. 93 4; lat. c. spin. 115 7; lat. 
isthm. 45 pL. 
Central series of four granules: several specimens found in the 
first collection. Considerable variation was seen in the two semi- 
cells of the same specimen. The form figured was the most 
common. 
SSeS : = 
Micrasterias conferta Novae-terrae var. nov. (PLATE 26, Fic. 8.) 
Long. 102; lat 93; lat. isthm. 124; lat. lob. pol. c. 
SP. 37 
This in some of its characters is like the var. hamata of Wolle, 
but the polar lobe is less widely separated from the lateral ones, 
the polar lobe not so wide at the apex and distinctly spinose. The 
edges of the lateral lobes adjacent to the polar lobe have a median 
angle, but not greatly developed. The constrictions are more open 
and the ultimate portions not so elongated as in the var. hamata. 
CosMaRIUM IMPRESSULUM MINOR Turner. (PLATE 26, FIG. 9.) 
Long, 164; lat. 12 4; isthm. 3.5 4. 
This form is common in the two collections. 
exactly like the forma minor of Turner in shape and measurements. 
It seems to be 
CosMartum pseUDopyRAMIDATUM Lund. 
Long. 50~56 ; lat. 31-33 4; lat. isthm. 9-10. 
Very common in the collections, varying slightly in size. 
STAURASTRUM DUBIUM West. 
Long. 282. lat. 22; lat. isthm. 10 2. 
Very common. 
