396 CusHMAN: Notes ON MICRASTERIAS 
thor, being long. 84-96 y, lat. 64-78 y, lat. lob. pol. 48-59 p, 
crass. 23 pu. 
As noted by Lagerheim, JZ KAztcheliu 
Wolle is a form of this species. There 
1 seem to be two distinct American forms be- 
sides the typical form of Nordstedt. They 
may be separated as follows: 
> M. DEPAUPERATA KiTcHELU Wolle.  Fic- 
URE 2. 
This name, as suggested by W. and G. 
S. West, should be retained for the form 
figured by Wolle (Desm. U.S. pl. 37, f 
3 1, 2. 1884), with the shorter and consider- 
ably wider polar lobe. It is much larger 
than the previous form. 
M. DEPAUPERATA Wollei var. nov. FIGURE 3. 
This name is proposed for the variety figured by Wolle as 47. 
Kitchelii var. (Desm. U. S. ed. 2. pl. 42. f. 2. 1892) and by W. 
and G. S. West as M. depauperata Nordst. (Trans. Linn. Soc. 
Lond. II. Bot. 5: p/. rg. f. r). This is nearer the typical form 
but is one-half larger, the sinus more open, the apical lobe shorter 
and the upper portion of the basal lobes considerably narrower 
than the lower. A typical specimen measures long. 150 /, lat. 
140 p, lat. lob. pol. 96 y, lat. isth. 26 #. Very common in Lake 
Watuppa, 
M. muricata (Bailey) Ralfs. 
This species was found in but one locality, Carver's Pond, 
Bridgewater. An average specimen measured long. 161 4, lat. 
127 #, lat. isth. 31 y, lat. lob. pol. 78 w. Inthe Trans. Linn. Soc. 
Lond. II. Bot. 5: 240, p/. rg, f. 7, W. and G. S. West give the 
varietal name tumida to a form which “ differs from the typical 
form in having a central protuberance near the base of each semi- 
cell.” Which should be considered the typical form is somewhat 
doubtful. In Bailey’s original figures a side view and an oblique 
view are given. In looking over his original drawings and notes 
several end views were found. Three out of four of these had the 
basal protuberance, in two cases even more marked than in the 
