790 General Notes. 
scribes the coxal glands of Scorpio, and also finds that the coxal — 
glands of Mygale are elongated and lobed as in Limulus. He 
remarks: “Possibly such coxal glands are in all cases the modi- 
fied and isolated representatives of the complete series of tubular 
glands (Nephrida) found at the base of each leg in the archaic 
Arthropod Peripatus.” As will be seen in the foregoing note on 
Peripatus, that animal is provided with a series of paired organs 
which Moseley and Balfour, with Sedgwick, regarded as Nephrid- — 
ia, homologous with those of Chetopod worms. 
t now appears that homologous organs exist in a third type of 
Arachnida, for not only do the spiders and Pedipalpi possess 
coxal glands, but also the mites. In his excellent “ Observations 
on the Anatomy of the Oribatide,” in the February number of © 
the Journal of the Royal Microscopical Society, Mr. A. D 
Michael describes a sac which he believes to be glandular, and 
which he calls the “super-coxal gland.” The organ was rst 
recognized in the mites of this family by Nicholet, who supposed 
it to be connected with what he and others imagined to be the 
stigma. 
When the upper part of the cephalothorax, and the adipose tissue 
which underlies it, has been removed, “ what appears to be the 
enlarged, blind end of a fine colorless sac, ma be seen on eati 
side of the body, the seemingly blind end being nearest to the 
eye; the sac descending obliquely downward and slightly forward, 
and being attached close to the acetabulum of the coxa of 
second leg; a closer examination shows that this is not the only 
attachment, but that the lower end is apparently bifurcated, $ 
that the second branch is attached much nearer to the center 0 
the body, and higher in level than the coxal branch. On di gut 
ing out this sac, and carefully extending it, a matter by no mean 
easy, it will be found that what seemed to be the blind end wa 
not the end at all, but that the whole organ is an elongated pe 
sage-shaped sac, bent upon itself in the middle and taking a 
gle turn, so that the two halves cross, but for some distan 
two limbs of the horseshoe (if 1 may call them so) lie ova aS 
other, or are so closely pressed against one another as to apf" 
one; it is only toward the end, that they stand free from S 
other when 77 situ.” e i 
Mr. Michael suggests that these glands are analogous s 
nephridia (segmental organs) of Vermes, and the green s “of 
Astacus and other Crustacea, and the coxal glands in scorp! i 
especially the leech, is very considerable as regards the S 
form of the organ, and to a lesser extent in the minuter be 
the n 
The sac (super-coxal gland) would correspond with the, 
the nephridium, and the globular body with the vesicle. 
