533 
PliOTOZOA. 
(^HyalodisciiSy Dactylos^hcorium, Leptophrys, Vampyrellay Cochliopodium)^ 
the fresh-watei’ /Sa?*co6?ma examined by the authors are arranged in the 
following manner ; — 
I. Monothalamia. 
1. M. Monostoma : one orifice only on the shell for the pseudo- 
podia. 
A. M. Lohosa. (a) Shell the product of secretion only (^Arcella, 
Pseudochlamys, Pyxidicula). 
(b) Shell incrusted with foreign bodies {Diffiugia). 
B. M. Rhizopoda. (a) Shell the product of secretion only : a, 
structureless {PlagiophrySy Lecythium) ; j8, distinguished by 
delicate structural detail {Eaglyphay Cyphoderia). 
(h) Shell incrusted with foreign bodies {Pleurophrys). 
2. M. AmpMstomata two orifices, almost opposite, for the 
pseudopodia. 
(a) Shell the product of secretion only (^Diplophrys). 
(Jb) Shell encrusted (^Amphitrema') , 
II. Heliozoa (which are not acknowledged as “ fresh-water Radio- 
laria ” or as related to the Radiolaria). 
A. II. Askeleta (ActinophrySy Actinosphcerium). 
B. II. Scelelophora. (a) Chalarothoraca (shell composed of very 
small pieces): Acanihocystisy PinacocystiSy lleterophrySy Rha- 
phidiophrySy Hyalolampe. 
(b) Desmothoraca (shell of a single piece) {lledriocystisy Cla- 
thrulina). 
Oiiramceba[^Ur-'\y g. n.. Leidy, different from Amoeba (pr.) in being 
provided with tufts of simple, unbranched, tail-like appendages, pro- 
jecting from the back part of the body ; these rays are not retractile, 
quite different from the pseudopods, and rigid and coarse compared to 
the delicate rays of Actinophrys. 0. vorax and lapsa, spp. nn., Leidy (6), 
and two unnamed forms. A similar creature has been observed by Archer, 
Q. J. Micr. Sci. xiv. p. 212. 
Deinamoeba[^Din-'] mirabilisy g. & sp. nn., Leidy (7), p. 142. Spherical, 
oval, or constricted, opaque, sluggish, protruding from both extremities 
numbers of long acute pseudopods, bristling everywhere, like the surface 
of the body, with minute spicules. 
Difflugia lobostomay crenulatay entochloriSy amphoray spp. nn., id. (6), 
D. acropodiay sp. n., Hertwig & Lesser (3), pp. 105-110, pi. ii. fig. 6. 
A transparent Difflugiay distinguished by its membranous, structureless 
investment, connected by long threads with the soft granular con- 
tents, probably D. ligatay Tat., is made the type of Catharia, g. n. ; 
Leidy (G). 
Amoeba zonalis, sp. n., id. 1. c. \ A. {Pelomyxa) sabulosay sp. n., a 
sluggish creature containing an enormous quantity of quartzose sand, 
id. 1. c. 
Gromia terricolay sp. n., Leidy (8), in the earth, about the roots of 
mosses that grow in the crevices of the bricks of city pavements, pro- 
bably contracted and quiescent during droughts, but expanding its nets 
