12 Froi, 
PROTOZOA. 
Dinenympha, id. 1. c. p. 148. D. gracilis. Ciliated; apparently inter- 
mediate between the two preceding forms. Habitat, as preceding. 
[Kote. — The descriptions of these three genera are not very distinct, 
and the Sub-order to which they belong is not clear.] 
Holotncha. 
Lacrymaria caspia^ GvemmsL QIO), p. 71, pi. ii. fig. 8a-d. Metamor- 
phosis given. 
Opalina caudata^ Zeller (32), p. 373, pi. xxiv. figs. 46-51. The develop- 
ment agrees with that of the other Opalines there described. Habitat, 
rectum of Bomhinator igneus. 
Anoplojdirya vermicular^, Leidy (29). Large. Habitat, rectum of 
Paludina decisa. 
GREGARINiE. 
Leidy, P. Ac. Philad. 1877, p. 196, in “ Remarks on Gregarines,” 
describes Monocysih agilis. 
Generalities, Cell-theory, Phylogeny, &c. 
In addition to the works already mentioned may be specially noticed : 
Brooks, W. K. On a Provisional Hypothesis of Pangenesis. Abstract 
in P. Am. Ass. xxv. p. 177. 
Ballinger, W. H., & Brysdale, J. The Development of the Ovum. 
M. Micr. Journ. xviii. p. 86 ; Nature, xvi. p. 178. 
An analysis and criticism of Biitschli’s Stud, tiber d. erst. Entw. d. 
Eizelle, &c. 
Elsberg, Louis. On the Plastidule Hypothesis. P. Am. Ass. xxv. 
p. 178. 
Giiiringiiello, — . Continuazione della Memoria sulla teoria di 
Darwin. Atti Acc. Tor. xii. pp. 748, 758, & 760. 
Huxley, T. Anatomy of Invertebrata. (London : 1877. Cited 
above). 
Contains some important statements as to Phylogeny, Abiogenesis, 
&c., in the Introduction. 
Lankester, E. Ray. Notes on Embryology and Classification. 
(London : 1877) ; Q. J. Micr. Sci. xvii. p. 399. 
Contains a further exposition of the author’s “ Planula- theory,” and a 
classification of the animal kingdom based on the facts of development. 
McCrady, John. A Provisional Theory of Generation. P. Bost. Soc. 
xix. p. 171. 
This combines the facts of general embryology with those of the 
reproduction of Protozoa, and compares the two. 
Minot, C. Sedgwick. On the formation of the Germinal Layers and 
