G14 
ME. LUBBOCK OK THE GENEEATIVE OEGANS, AND 
In Ojjilio agrestis and Nonastoma bimacidaftmi the male generative organs -were 
formed nearly as in Plialcmghim, but I have not actually traced the connexion between 
the testis and the ductus ejaculatorius. In 0. agrestis, however, I traced the latter up 
to its bifurcation, and the vasa deferentia as far as the great tracheal trunks ; so that no 
doubt in all the Phalangida3 these parts are formed on the same type. 
ScoEPiomcyE. 
Clielifer (Plates XVI. and. XVII. tigs. 27-36). — Although the testis of Chelifer closely 
resembles that of the Scorpion, the ovary of the two genera is very ditferent. Instead 
of the net-like complex organ of the Scorpion, we find in the smaller Chelifers only a 
simple, tubular organ, extending backwards from the vulva and bearing from thirty to 
fifty eggs in one stage of development, enclosed in spherical follicles on short stalks, and 
arranged in a row on each side with more or less regularity. 
Between these eggs lie others which are not so far advanced, but which, when the 
first have been laid, will in their turn attain to maturity. Besides these two series of 
eggs, I generally found other small follicles, with irregular yellowish contents; these 
are probably follicles from which the eggs have escaped, and their yellowish contents 
are “ corpora lutea,” homologous Avith the yellowish contents so often found in insects at 
the lower end of the egg-tubes, and Avhich have been compared by SiErn to the “ cor- 
pora lutea ” of the higher animals. 
I am not able to throAV much light on the early stages of egg-formation ; but it 
seemed eA'ident that in Chelifer the egg-follicle was formed by one single simple mem- 
brane, the epithelial cells occupying the stalk only. These Avere so delicate, that Avith- 
out the action of reagents they could scarcely be perceived ; but if Avater, either pure or 
Avith a trace of ammonia, be used instead of syrup, they become more evident. Although, 
hoAvever, the follicle is not lined by any epithelium, occasionally one of the cells could 
be detected in it. 
The epithelial cells varied from -sixths of an inch to ■gifo~jfbs of an inch in diameter, 
and had a distinct though pale nucleus. Among them I found other solid-looking 
bodies, about -g-^^-ths of an inch in diameter. I never succeeded in making out satis- 
factorily the origin of the Purkinjean vesicle; but, from analogy Avith Avhat is stated to 
be the case in Spiders, and Avith Avhat occurs in other animals, it seems probable that 
one of the epithelial nuclei increases in size, developes the yelk round itself, and causes 
the external membrane to bend outAvards. The macula appears to be originally simple ; 
it is always, however, a difficult subject for investigation. 
In the early stages the yelk possesses a definite outline, but, as the action of a drop 
of ammonia shoAVS, this does not arise from the presence of any true membrane. It is 
at first clear and transparent ; but Avhen it has attained a size of 5-^th of an inch, yelk- 
globules begin to appear in it ; and these become more and more numerous, until, Avhen 
the egg has attained about 3-^th of an inch, the greater part of it is occupied by them, 
and the Purkinjean vesicle completely hidden. They are generally someAvhat collected 
