514 CusnmMan: Desmips FROM Bronx Park, NEw YorK 
11. Penium margaritaceum Breb. 
Diam. 30, length 190; another specimen, diam. 25 p, 
length 2304. Common. (H. C., No. 327, 330, etc.) 
12. Cosmarium granatum Breb. 
Diam. 32, length 404. Occasional. (H. C., No. 332.) 
13. Cosmarium laeve Rab. 
Diam. 14 4, length 20, isthmus 4. Occasional. (H. C., 
No. 328.) 
14. Cosmarium laeve septentrionale Wille. 
Diam. 10 p, length 14, isth. 3.54. Smaller than the meas- 
urements given by Wolle. Specimen like p/. 43, f. 74, Wolle, 
1892. Occasional. -(H. C., No. 328.) 
15. Cosmarium ovale Ralfs. 
Diam. 75 p, length 95 », isth. 19. Common. (H. C., No. 
330.) 
16. Euastrum pingue Ef. 
Diam. 33 », length 38 y, isth. 9. Crenations almost approach 
the appearance of granules on the edge of one of the semi-cells. 
Occasional. (H. C., No. 330.) 
17. Staurastrum crenulatum (Delp.) Naeg. 
Diam. 35/4; one semi-cell triangular in end view, the other 
5-rayed. It is more like this species than any other, although the 
end of the triangular semi-cell greatly resembles S. polymorphum. 
(Ht. G., No;:328.) 
18. Staurastrum muticum Breb. 
Diam. 44 4. Common. (H. C., No. 332.) 
19. Staurastrum orbiculare (Ehrb.) Ralfs. 
Diam. 45 », length soy, isth. 154. Common, (H. C., No 
328.) 
Boston Society or NATURAL History, 
June, 1903. 
