QUARTERLY CHRONICLE. 95 
Professor Leuckart’s paper on ‘‘The Sexual Reproduction of the 
Larve of Cecidomyia.”’ In our last Chronicle we referred 
to this paper, and noticed Herr Hamin’s essay on the same 
subject. Professor Leuckart describes very carefully the 
germ-stocks and germ-balls of the larve, and makes some 
valuable remarks on the homological aspects of this curious 
case of agamic procreation. He points out that the germs 
which are developed in the larvee, while possessing many of 
the characters of eggs, and occurring in the position which is 
usually occupied by the ovaries, are yet but pseud-ova, since 
they are not under any circumstance capable of receiving 
impregnation. The name pseud-ovum Professor Leuckart 
considers would be well applied to such bodies as these, had 
it not already been used by Professor Huxley for true eggs 
capable of being impregnated, which develop spontaneously 
without coitus. The case is regarded as quite parallel with 
that occurring in Aphis, the germs in the latter case being 
arranged in such a manner as to make them approach more 
closely in character to ovaries. These larvee may be sought 
for in most decomposing vegetable matters, such as dead 
trees, rubbish heaps, &c., with a fair chance of meeting with 
them, though they are liable to escape observation on account 
of their exceeding minuteness. 
“The Histology of Rhynchopora Geinitziana.”—Professor 
King returns to the contest on this subject in the last number 
of the ‘ Annals.’ He has now made examination of various 
specimens with a good compound microscope, and still main- 
tains that the valves of this Brachiopod are punctured 
through and through, and not merely pitted. He explains 
away the evidence brought forward by Dr. Carpenter (noticed 
in our last Chronicle) by the supposition that, although the 
sections made by Dr. Carpenter were vertical, the perforating 
tubes do not run vertically, but take a slightly oblique direc- 
tion. If this were the case, as Mr. King maintains, a vertical 
section would, of course, truncate the tubes, and produce the 
appearances given in Dr. Carpenter’s figures. 
“ On the Structure of the Mouthin Pediculus,” by Professor 
Schjodte.—This paper is translated from the Danish, and 
deals with its subject in a most vigorous and interesting 
manner. Dr. Landois, whose ‘‘ Researches on the Pediculi 
of Man” have lately been published in ‘ Kolliker’s Zeitschrift,’ 
maintains with others that the mouth of these animals is 
provided with a pair of mandibles. Swammerdam and other 
old observers described it simply as a sucking apparatus. 
Professor Schjédte now comes forward to support the latter 
view. He believes that Landois and others have been misled 
VOL. VI.—NEW SER. H 
