INTERNAL ANATOMY OP SQUILL A. 
403 
from Naples and fixed and preserved by the methods 
enumerated in the Appendix ; also well-fixed Erichthus larvm 
of an unknown species of Sqnilla, 12 mm. and 14 mm. in 
length respectively, preserved in the store-room at University 
College, London. Several complete series of transverse and 
longitudinal vertical sections were made of both adult and 
larval specimens, and the following description is based upon 
the careful study of these sections, assisted by dissections 
both of adult Squilla desmarestii and Squilla mantis 
and whole mounts of the smaller larvae. 
Before proceeding further I wish to offer my sincere thanks 
to Dr. W. T. Caiman for kindly seeing the MS. through the 
press, and to Miss E. M. Brown for the careful drawings 
which illustrate the pa, per. 
The Maxillary Glands of the Adult Squilla Desmarestii. 
Macroscopic Appearance. 
The paired maxillary glands lie at the hinder end of the 
“ neck of the animal, nearly on a level with the proximal 
joint and epipodite of the large subchelate second thoracic 
limb. Previous to dissection they may be seen through the 
transparent cuticle covering the sides of the neck as large 
yellowish masses, provided that the anterior thoracic limbs 
be pulled outwards from their forwardly directed position 
under the sides of the carapace. On removal of the dorsal 
carapace the paired glands are found to lie just under the 
hypodermis. Superficially, the glands closely resemble a pair 
of adductor muscles (the vertically descending gland-ducts 
simulating tendons) connected with the mandibles (PI. 28, 
fig. 1), and it seems probable that they have been identified 
as such by previous observers, since otherwise it is difficult 
to understand how such conspicuous structures could escape 
attention. Viewed from the dorsal aspect, each of the two 
glands is seen to be a pear-shaped, compact yellowish mass, 
which tapers ventrally into a thin stalk, the stalks of the two 
glands converging towards the median line aud disappearing 
