STRUCTURE, ETC., OF PLEISTOPHORA PERIPLANETH. 629 
tions of the Malpighian tubules, attracted attention. Several 
of these structures are represented in figs. 21—24, and 37. 
They present an appearance similar to the trophozoites and 
spores of Pleistophora periplanete upon a smaller scale, 
and stain in similar manner with the same reagents. The 
trophozoites (figs. 21—23) are, however, of a more delicate 
structure than the trophozoites of Pleistophora peri- 
planete, the nuclei being much smaller and more compact, 
while the protoplasm is also more delicate. The spores 
(figs. 22 and 37) are very much smaller, measuring not more 
than 1 »—2 4 in length and about ‘5 in breadth, instead of 
55u xX 3pm as in Pleistophora periplanetez. No inter- 
mediate stages between these forms and Pleistophora 
periplanetz have as yet been observed, and I am inclined 
to think that these structures are the trophozoites and spores 
of a new Myxosporidian parasite. The structures are, how- 
ever, in need of further investigation, and pending further 
research I have decided only to mention their occurrence 
without giving them a name. They may turn out to belong 
to the life-cycle of Pleistophora periplanete, and indeed 
little beyond the statement that they are almost undoubtedly 
organised bodies is permissible, under the circumstances. 
LITERATURE. 
1. 1867. Batprans, G.—< Etudes sur la Maladie Psorospermique des Vers 
a Soie,” extrait du ‘Journal de l’anatomie et de la physiologie,’ de M. 
Ch. Robin. 
2. 1894. Guriny, R. R.—‘ Bull. U.S. Fish Comm.,’ Rep. of Comm., 1892, 
pp. 65—298. 
8. 1898. Dor.ein, J.—‘ Zool. Jahrb.,’ Bd. xi, Studien zur Naturgeschichte 
der Protozoen: III. Uber die Myxosporidien.” 
4, 1899. Dorie1y, J.— Fortschritte auf dem Gebiete der Myxosporidien- 
kunde,” ‘ Zool. Centralbl.,’ vi Jahrg., Nos. 11, 12. 
. 1899. Mrazex, Al.—‘S. B. Bohm Ges.,’ viii, 5 pp. 
. 1902. ScHaupinn, F.— Archiv fiir Protist.,’? 306—343. 
- 1902. Srempett, W.—‘ Zool. Jahrb. Abth. f. Anat.,’ xvi, 2, pp. 235—272. 
- 1903. Lutz and SpLenpore.—‘ C. B. Bakt. Pk.’ (1), xxxiii, pp. 150—157. 
vot. 49, PART 4.—NEW SERIES. 46 
Onna 
