t 
= 
287 
E. pinnatum Ralfs, I have from Florida, Connecticut and 
New York. 
At Cold Spring Harbor, N. Y., a number of species of Micras- 
terias were abundant last summer, the most noteworthy being JZ. 
Soliacea Bail. (sometimes in filaments of a hundred cells), M. pa- 
pillifera Breb., and M. muricata (Bailey) Ralfs. M0. furcata Ag. 
was also common and extremely variable, as shown elsewhere.* 
Of Cosmarium many interesting forms have been found. The 
following deserve mention: 
C. anisochondrum Nordst. (Mich.). 
C. Boeckii Wittr. (Conn.). - 
C. calcareum Wittr. (Mich.), Fig. 13. This agrees well with 
Wittrock’s description and figures, + except that the larger gran- 
ules, nine or ten in number, are often arranged in an ellipse with 
two partly fused ones in the center. Dimensions: length 18- 
20; diameter 18 /. 
C. cyclicum Lund. (Ann Arbor, Mich.), Fig. 5. 
C. impressulum Elfv. (Mich.), Fig. 6. This has probably been 
Passed over as one of the forms of C. Meneghinti Breb.. It is 
quite common. 
C. monomazum Lund. var, polymazum Nordst. (Edgemoor, 
Ind.). : ee 
C. protractum Arch. (Evanston, IIl., and Waverly, Mass.). 
C. Quasillus Lund. (Ann Arbor and Northfield, Mich.). 
C. subglobosum Nordst. (N. Y.), Fig. 7. This agrees well with 
Nordstedt’s figures and description, except in the relatively 
short cells. The dimensions given in the original description 
were, length 37-48 , diamever 24—40 #, while in these specimens 
they are, length 33-36 “, diameter 26-28 -. 
C. subspeciosum Nordst. (Mich). ‘ 
C. sulcatum Nordst. (Mich. and Conn.), Fig. 11. The speci- 
mens were quite abundant and were typical. Dimensions: length, 
384; diam., 30 u; isth., 8 ». 
C. suprospeciosum Wolle (Ann Arbor. Mich). 
* Botanical Gazette, 19: 56, p/. 6 (Feb., 1894). : 
+ Om Gotlands och Glands Sétvattens-alger, 58, 21. 4, fig. 13 (187 3 pace 
t De algis aquae dulcis et de characeis ex insulis Sandvicensibes & OV. 7 
. Ws reportatis, p, 14, p/. 7, fig. 17 (1878). 
