186 Records of the Indtan Museum. [Won Vay 
glands which are sometimes placed so close to the 
surface of the body that the epithelial cells over 
them become more or less flattened and displaced 
sidewise. 
(2) The dermis or corium consists mainly of connective 
tissue with a few muscle fibres and unicellular glands. 
The glands are large flask-shaped cells generally 
placed beneath the epithelial layer. The cell- 
content consists mainly of the secreted materials 
with a little protoplasm and a small nucleus at the 
base. Immediately beneath the epithelial layer 
the connective tissue consists of large bundles of 
white fibres piaced nearly at right angles to the 
surface and of smaller bundles which are branched 
off from the vertical ones and are spread horizontally 
in all directions. The fibres ultimately form a 
close network in the interstices of which le the 
connective tissue cells. These are round, oval or 
fusiform cells with large nuclei. Some of these and 
others with branching processes contain brown 
pigment granules, which are densely placed beneath 
the epidermal layer. Beneath this are one or two 
layers of several muscle fibres scattered irregularly. 
The deeper layers of connective tissue consist of 
loosely arranged bundles of white fibres with a few 
yellow fibres and numerous connective-tissue cells. 
These cells are free from pigment granules. 
II. RESPIRATORY SYSTEM (pl. xxv, fig. 5). 
The pulmonary chamber is much atrophied; it forms a small 
oval sac lying in the anterior-third of the body beneath the right 
lateral wall of the mantle. It extends almost to the junction of 
the mantle with the foot below and stops short of the middle line 
above. The pulmonary chamber seems to open to the interior by 
an aperture placed at the antero-lateral corner to the right; the 
aperture is placed just behind the anus. The pericardium extends 
obliquely on the roof of the pulmonary chamber from the right 
antero-lateral towards the left postero-lateral corner. The kidney 
lies on the roof at the back. The roof of the pulmonary chamber 
is closely adherent to the inner surface of the mantle. 
III. VASCULAR SYSTEM (pl. xxv, fig. 5). 
The pericardium lies obliquely on the roof of the pulmonary 
chamber. ‘The dorsal wall of the pericardium seems to be closely 
adherent to the body-wall. 
The ventricle is placed in front of the auricle. The ventricle 
is a thick-walled pyriform sac with the ventral surface flattened 
