114 



THE AMERICAN MONTHLY 



[June, 



/. Diameter j^q-q to ygVir ""i- (^3"^^ ■'^•) ^ 15-20 times longer than wide, 



dilatatiim^ 50. 

 /. Diameter 2-5^71 t*^ WiyT)^ ^^^- (10-12 //) ; iS-20 times longer than wide, 



u n du latu7n^ 51. 

 15. Triploceras. 



(Mr. Wolle unites this with Docidiuiit , 14 ) 



1. Tooth-like prominences oblong verticillatiim^ 53. 



3. '^ acute - . . . gracile^ 53. 



16. Calocylindrus. 

 § Chlorophyll homogeneous (i). 

 § " divided or scattered in each semi-cell (2). 



Length twice the width or less : cytioderm punctate or granulate {a). 

 " •' " '' cytioderm smooth {b) . 



cytioderm \vith 5-7 costre. costatus. 56. 

 Length 2^ or 3 times the width : cytioderm punctate (c). 



'•• 4 to 6 times the width : cytioderm smooth . . fn/'>n/t/is. 54. 



2. Cell twice or more longer than wide ; cytioderm punctate. 



psetidoconiiatus^ 55. 



3. "• " " •• cytioderm smooth, Thxvaitsii^ ^d. 



a. vSemi-cell subquadrate RalfsiL 54. 



a. " cylindrical, rounded : constriction slight . . ciicurbita^ 54. 



a. '' " constriction wide, shallow . . . connatus^ 55. 



b. Cell somewhat fusiform, ends subconically rounded . . . curtz(s, 54. 



b. Cell subcylindrical, ends broadly rounded .... diplospora^ 56. 



c. Cell subc}lindrical, ends rounded ; nuclei large, single or double, CIcvei., 56. 



[ To he continued. \ 



EDITORIAL. 



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American Society of Micro- 

 scopiSTS. — The ninth annual meet- 

 ing, to be held at Chautaugua, N. 

 Y., begins August loth, one week 

 before the meeting of the American 

 Association at Butlalo, and will con- 

 tinue four days. The President. Prof. 



Burrill, has issued a circular calling 

 for a good attendance and for com- 

 munications of interest, and express- 

 ing sanguine expectations of a large 

 meeting. All necessary information 

 concerning the meeting can be ob- 

 tained from the Secretary, Prof. D. 

 S. Kellicott, 119 Fourteenth street, 

 Buftldo. 



Mr. E. H. Griffith, who has man- 

 aged the • working session ' so suc- 

 cessfully in the past, is again in 

 charge of it, and has also issued a 

 circular of information. Great prep- 

 arations are under way to make this 

 an important meeting; the Hon. J. 

 D. Cox \\^ill have charge of the pho- 

 tomicrographic \york : Prof. D. S. 

 Kellicott and Prof. T. B. Stowell, 

 of Cortland, N. Y.. Avill conduct a 

 dredging expedition on the lake, and 

 other able co-laborers are named. 

 Cii'culars pertaining to the working 

 session can be obtained from Mr. 

 Griffith, whose address is Fairport, 

 N. Y. 



