JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE VIII, 
Illustrating Mr. Brightwell’s paper on Triceratium and 
Cheetoceros. 
Fig. 
1.—Tr. undulatum, end view. 
2.—The same, front view. ‘The frustules are united often in a filament of 
six to eight frustules. 
3.—Tr. undulatum in the doubtful state, with endochrome. 
4.—The same without the endochrome, showing the banded and fringed 
frustules. 
5.—The same, a four-sided end. 
6.—Tr. malleus, end view. 
7.—The same, in filament. 
8.—Var. of Zr. undulatum, Monterey earth. 
9.—Chetoceros Peruvianum. 
10.—The same. 
