156 SKETCH OF THE INFUSORIA 



3. Gomiihovc ma acuminatum 1 (Tl. Ill, fig. 6.) Striate, corpuscles 

 elongated, wcdgcform, end swollen and pointed, contracted on the 

 side. 



The small sjiccies (fig. 6) agrees pretty well with the above 

 characters. It is common in ponds near West Point. I have 

 also seen it in several American specimens of fossil infusoria. 



4. Gomphoncma . (PL III, fig. 7.) Frastules smooth, gemi- 

 nate or in fan-shaped groups, one side elongated, wedge-shaped, 

 truncate ; the other side obovate; pedicel repeatedly dichotomous. 

 Marine. 



I have examined this species only in a dry state, having first 

 noticed it on a glass slide on whith I had preserved some speci- 

 mens of Echinella Jiahellata from Stonington, Conn. 



The figm-e is drawn from the dry specimens. 



ECHINELLA, EUt. 



Carapace simple, siliceous, fixed at one extremity to a pedicel, 

 vjedgefoiin, lo/ig-er than broad, fan-shaped or verticillate by spon- 

 taneous division. 



1. Echinella Jiahellata. (PL III, fig. 8.) Smooth, corpuscles linear, 

 cuneiform, truncate, slightly three-toothed, striae longitudinal, one 

 tenth of a line without the pedicel. Lic/miophora flahellata, Ag. 

 Greville, in Hooker's English Flora, V. p. 408. 



This beautiful marine production presents, in its fan-shaped 

 groups of crystal-like corpuscles, an exceedingly elegant appear- 

 ance. The fans are supported by long, flexible clavate pedicels, 

 which are grouped together in large bunches covering filamentous 

 marine Alga? and Zoophiles. 



I found it quite abundant at Stonington, Conn, in July. It is 

 •said to occur also at Scotland, Venice, and at the Cape of Good 

 Hope. 



2. Echinella . (PL III, fig. 9.) Corpuscles smooth ? lanceo- 

 late, truncate ; pedicel short, broadly clavate, often nearly circular, 

 supporting the radiating, closely aggregated corpuscles. 



I detected this very elegant species about a year since in the 

 Hudson River near West Point, where it grows upon Potamoge- 



