QUARTERLY CHRONICLE. 37 
lutea. The ovary of the cat, whose structure has already 
been amply discussed by Schroén and Pfluger, has also formed 
part of his study, im consequence of which he has been 
enabled, he says, to establish rather more definitely than 
before certain points with respect to the mode and formation 
of the membrana folliculi. He has also added some prelimi- 
nary observations on the structure of the human ovary in the 
foetus. And his researches on this subject have led him on 
to the study of the earliest stages of development of the 
sexual glands, a subject of great general interest. 
2. The second paper is one by L. Cienkowski, “ Contribu- 
tions to a Knowledge of the Monadina,” in which will be 
found much matter of great interest to all microscopical ob- 
servers, but of which it will be needless here to say more, as 
we shall hope, in our next number, to give a translation or 
full abstract of this valuable communication. The author, 
we may say, is not inclined to adopt the opinion of those who 
regard all the Monadina as motile spores of various Algz 
and Fungi, being convinced that, although this may be true 
of a great many of these Infusoria, still there are whole series 
of whose independent existence there can be no doubt. 
3. The next contribution is ‘‘ Researches on the Develop- 
ment of the Urinary and Sexual Systems,” by Dr. C. Kupffer, 
of Dorpat. 
4. “ On Phreoryctes Menkeanus, Hofm., with Remarks on 
the Structure of other Annelids,” by Professor Leydig, of 
Tubingen.—The extraordinary worm which forms the subject 
of Professor Leydig’s communication was originally discovered 
by Herr Menke, in a brook at Pyrmont, and it was first de- 
seribed by Hofmeister in the ‘ Archiv fiir Naturgeschichte’ 
for 1843, under the name of Haplotaxis Menkeana, which 
was afterwards changed to its present appellation. A further 
account of it will be found, by the same author, in his 
‘ Arten der Regenwiirmer’ (1845). Fora long time the only 
known habitat was the original site in which the worm was 
discovered, or its immediate vicinity; but it has since been 
met with by Leydig at Tubingen, and it is stated by 
Leuckart (1860) to be common at Giessen, so that we may 
hope to hear of its occurrence in this country. A second 
species, apparently belonging to the same genus, was de- 
scribed by Schlotthauber in 1859, in the ‘ Report of the Got- 
tingen Meeting of Naturalists, who proposed to change the 
generic name to Georyctes. 
‘It is impossible here to give even a summary of the excel- 
lent account, illustrated by beautiful figures, given by Leydig, 
of the structure and affinities of this remarkable creature 
