1892.] Zoology. 959 
sites which may be of interest to the readers of THE NATURALIST, as 
most of the articles are upon American species. 
Under the title Bau und Entwicklungsgeschichte von Pentastomum 
Proboscideum R. und P. Subcylindricum Dies (Z. f., w. Z., 1891, lii, 
pp. 85-157. Taf. vii-viii, Figs. 1-49), he gives an account of the 
microscopical anatomy and histology of the American Pentastomum 
(more correctly Porocephalus) proboscideum, found in the lungs of 
American snakes. He succeeded in infectihg white mice with the 
embryos, and in this way raised P. subeylindricum, which had been 
supposed to be a separate species. The paper covers an historical 
review, synonomy, list of hosts; ten snakes for the adult form, ten 
mammals for the larva; geographical distribution, structure of the 
embryo ; description of five stages in the development; bibliography 
of the order Linguatula. 
It is impossible to enter into a detailed account of the results in this 
short review ; suffice it to say that in the embryo he has found a well- 
developed nervous system, intestine, etc.; he denies that the boring 
apparatus of the embryo consists of rudimentary mouth-parts. In the 
first part of his paper he is evidently in doubt as to the homology of . 
the four hooks found in the adult, but from his later statements he 
evidently believes them to be homologous with the mouth-parts rather 
than with the third and fourth pairs of legs of other arachnoids, as is 
now the generally accepted view (Claus). 
- Sur la Biologie des Linguatules (Compt. Rend. d. 1. Soc. d. Biol., 
Paris, 1891, pp. 348-353) is a discussion of the various theories in 
regard to the wanderings of Linguatula and Porocephalus (Pentas- 
tomum). ; 
Under the title, Notes on Parasites, Stiles is publishing a series of 
short informal articles upon observations on various parasites. Each 
article is numbered according as it is finished. 
1. Sur la dent des Embryons d’Ascaris (Bull. d. 1. Soc. Zool. d. 
France, 1891, pp. 163-164) has already been reviewed in this journal. 
2. Jour. Comp. Med. and Vet. Arch., 1892, pp. 517-526, twelve figs., 
gives a fuller description and figures of the parasites. Stiles mentioned 
in his Note Préliminaire sur Quelques Parasites (Bull. d. 1. Soc. Zool. 
d. France, 1891, pp. 163-165), Coccidium bigeminum, a new species of 
sporozoa found in the intestinal villi of dogs; Dispharagus gasterostei, 
Stiles, 1891, the only member of the genus as yet found in fish; Mer- 
mis crassa v: L., which the author found escaping from larvee of Chir- 
onomus plumosus. 
3. On the intermediate host of Echinorhynchus gigas in America 
(Zool. Anzeiger) has been reviewed in THE NATURALIST. 
