102 Sketch of the Infusoria of the family Badllaria. 



Miiller found his specimens abundant on Ulva latissima ; I found 

 mine pretty common among Enteromorpha, Polysiphonia, and 

 Potamogeton, wliicli grow together in brackish water on the 

 flats in the Hudson River, near West Point. 



2. Badllaria 1 tabellaris. (PI. 2, fig. 36, a, h.) Smooth, carapace 

 linear, narrow, swollen in the middle, dividing into quadrangular plates 

 of variable length, ovary lobed and yellow, -^-^ to -gV line, (width of 

 filament.) Sjn. Diatoma focculosvm, Kut.z.,Ijmn. 1833, PI. 17, fig. 67, 

 Diato7na Jlocculosum, Greville, in Brit. Flora, Vol. V, p. 406. 



This species is very common in all parts of the United States 

 which I have visited. It is easily recognized by its zigzag 

 chains, composed of plates (individuals) of various width, which 

 have the middle and two outer edges considerably thickened, as 

 is sl«Dwn in the side view, fig. 36, b. 



In fig. 37, a, b, is represented what I believe to be the full 

 grown state of the species. It at first view appears very distinct 

 from fig. 36; but on examination, we find the same thickening 

 of the middle and ends, and similar transverse lines. The two 

 varieties or states occur together ; both are also found fossil. 

 They are very abundant in ditches and ponds near West Point. 



3. Badllaria . (PI. 2, fig. 38.) This is a marine species, 



which I found at Stonington, Conn., and Staten Island, N. Y., adhering 

 to filamentous Algae. It is distinguished by having on each half of its 

 frustules two lines which commence near the centre and run straight 

 and parallel, until they arrive near the extremities, when they suddenly 

 become falcate for a short distance, and then resume their original di- 

 rections. The curved portions of the lines have some resemblance to 

 the upper portion of a pair of tongs. The position of these lines is very 

 similar to those on Badllaria Meneghinii. (See Schlechtendal's Lin- 

 n^a, 1840, Tab. IV, fig. 1.) 



TESSELLA. 



Free, carapace simple, bivalve or imiltivalve [siliceous) pris- 

 matic, compressed inform of plates, forming zigzag poly pidoms 

 by imperfect spontaneous division of the body, and perfect divi- 

 sion of the carapace. The chains have spontaneous motion. 



Tessella catena. (PI. 2, fig. 39?) Carapace lamelliform, often 

 broader than long, 4-24 longitudinal series of transverse striae, 10 strise 

 in y^ij line. 



Fig 39 is copied from a species, of which I found a few indi- 

 viduals adhering to a dried Alga from Stonington, Conn. It ap- 

 pears to belong to T. catena. 



