404 
W. N. F. WO(3DLAXD. 
one on eacli side of the large sub-oesophageal compound 
ganglion [U. Th. G., PL 28, fig. 1). On closer inspection (PL 
28, fig. 2) the thick upper portion of the pear-shaped gland is 
seen to be deeply grooved on its outer side to allow space for 
a large body-muscle which happens to traverse the body- 
cavity in the proximity of the gland. Although the gland is, 
in parts, closely Avrapped round the muscle, yet there is, of 
course, no organic connection betAveen the tAvo structures 
In fig. 2 (PL 28) the duct of the gland is seen to enter the 
base of the maxilla (the second maxilla), and, after dilating 
slightl}^ to form a bladder, to open on the extremity of the 
small papilla already described by Caiman (3), who had pre- 
viously suggested that the minute orifice present might prove 
to be that of the maxillary gland. In fig. 2 (PL 28) are also 
shoAvn the numerous minute flask-shaped multicellular glands 
Avliich are to be found scattered in many other regions under 
the hypoderniis. These glands are connected Avith the setae 
borne on the cuticle, and have been previously figured and 
described (under the general name of driisenzellen,^^ and 
often incorrectly stated to be unicellular glands) by Claus (5), 
Jurich (12) and others. A draAving of a section through one 
of these glands (shoAving the gland lumen) is shoAvn in Text- 
fig. 8. Fig. 2 (PL 28) represents the isolated maxilla and the 
attached gland as seen in spirit under the dissecting micro- 
scope ; Avhen in balsam the numerous seta gla,nds are usually 
almost invisible, since staining reagents rarely penetrate 
sufficiently in order to render them conspicuous. The minute 
papilla Avith its gland opening is situated on the convex side 
of the maxilla, i. e. aAvay from the mouth. The gland itself 
is, as Ave shall see, closely invested Avith squamous epithelium, 
and in size is about 4 mm. long, excluding the duct and the 
bladder, and about 2’5 mm. in maximum Avidth. 
General Histology. 
The general position in the body and histological construc- 
tion of the gland may be gathered from a perusal of fig. 3 
