318 
Transactions of the Society. 
Coxal and Racemose Glands , and Expulsory Vesicles. 
It is in these glands that the most marked departure from any- 
thing yet described in the Uropodinse occurs. 
Coxal Glands. — These are not unknown among the Gamasidge. 
Winkler figures one as attached to the third leg of Gamasus fucorum ; 
it appears small, and is furnished with a duct which is very small in 
diameter, but rather long ; he says very little about it in his letter- 
press, but there he puts a query to the expression “coxal gland.” 
As far as I understand the intention of his few words, he implies 
that he found these glands connected with all the legs. 
G. formicarise possesses a well-marked and rather large coxal or 
super-coxal gland on each side of the body, but it is attached to the 
second leg only ; I was not able to find any similar organ attached 
to either of the other legs. The gland is rather flattened, some- 
what irregular in shape, but more or less oval, and is composed of 
medium-sized secreting-cells ; it communicates with the coxa by a 
largish, irregularly undulated duct. The form of the parts and the 
size and position relatively to the coxa may be judged of from fig. 11, 
which is drawn to scale ; and the appearance of the gland and duct 
seen on edge is shown by fig. 12 more highly magnified. 
The remarkable feature of the organ is the extremely large size 
and fleshy nature of the duct, which almost appears like a prolonga- 
tion of the gland and as if it had some glandular function itself. The 
duct is very large and thick, and varies much in width in different 
parts, but in a wholly irregular manner ; its lumen, however, is small. 
The racemose glands , or perhaps 1 should rather say the organs to 
which I propose giving that name, are new to me ; I cannot recollect 
any really similar organs in the Gamasidae/ or indeed in any other 
Acarina ; they lie immediately under the cuticle of the dorsal surface, 
and are composed of smallish rounded cells which stain deeply with 
carmine,' &c. ; they are paired organs, those on the opposite sides of the 
body corresponding, although each may vary somewhat in detail from 
its fellow. These glands are numerous, and exhibit considerable differ- 
ences in form and size ; but they are all organs of the same character ; 
composed of similar cells, branching in a tolerably similar manner, 
all the branches of one gland being in one plane, so that the organ 
may be said to be flat ; the whole plane may be somewhat curved, 
but the individual branches do not spread over or under those adjoin- 
ing them. Far the largest of these organs is placed near the lateral 
edge of the dorsal surface immediately beneath the cuticle, on each 
side of the body, near the third leg. One of these is drawn (fig. 13), 
and the drawing will probably convey a better idea of it than any 
description. It will be seen that it is a richly-branched organ, the 
branches all of more or less equal width, and each branch maintaining 
a tolerably even width through Dut, except for a tendency to become 
slightly enlarged at its distal end. It will also be seen that all 
