148 THE AMERICAN NATURALIST. (VoL. XXXIX. 
Gammons); and Mt. Moosilauke (collected by Warren A. 
Priest). Identified specimens from this latter group of locali- 
ties are preserved in the collections of the writers and are 
referred to by slide numbers under each species. For the other 
localities the number of the slide in the collection of the Boston 
Society of Natural History which contains an identified speci- 
men is given. Thus all the localities and species may be 
verified by actual material. A mounted set of material from 
the second set of localities has been deposited in the collection 
of the New England Microscopical Society. 
The arrangement of the genera and species follows that of 
Leidy's monograph. The determinations also follow the same 
work as it is still the standard work of its kind for our species. 
The following species and varieties were identified : — 
Difflugia globulosa Dujardin. 
The test of this species showed considerable variation. It was 
usually of coarse sand grains, but in some specimens included 
diatom valves, and in a few cases there was a chitinoid mem- 
brane with more or less extraneous matter attached to it. Sev- 
eral cases of dividing specimens were noted. 
Size.— Length, 46-76 y; breadth, 40-87 u; diameter of 
aperture, 26-45. As noted by Leidy, 
the test composed of coarse sand grains 
with a chitinous test. 
Localities.— Mt. Munroe (Cushman Coll, nos. 193, 194); 
North Woodstock (Henderson Coll., no. 57, Cushman Coll., no. 
181) ; Lake of the Clouds (B. S. N. H, no. 4319); Profile 
Lake (B. S. N. H., no. 4313); Franconia (B. S. N. H., no. 
4307); Saco Lake (B. S. N, H., no. 4324). 
the specimens having 
are larger than those 
Difflugia pyriformis Perty. 
of large size. In a col- 
