Bauhaus-Universität Weimar

The Cyclopaedia of Anatomy and Physiology, vol. 4: Pla [corr.: Ple] - Wri
Todd, Robert Bentley
ated on the right side of the neck beneath the 
corresponding lateral fin : the liver is of no 
great bulk, and forms a nearly globular mass. 
The organs of generation consist of an 
ovary which occupies the greater portion of 
the right side; of an oviduct of moderate 
length ; of a testicle which is almost as large 
as the ovary, and of a common deferent canal. 
The penis is here, as in Clio, an organ al¬ 
together distinct from the testicle : it is situ¬ 
ated, as already said, beneath the oesophagus, 
where it is folded upon itself ; and when pro¬ 
truded, issues through an orifice placed in the 
front of the neck and a little below the mouth. 
It is represented in situ in fig. 114.7, and 
detached in 8. 
The brain {fig. 114. 7, r) is large, flat, 
and of a square form, slightly narrowed pos¬ 
teriorly : the nerves issue principally from its 
angles, two of them going to join a double 
ganglion situated beneath the oesophagus. 
The salivary glands appear to be wanting. 
Pneu3I0dkrma. — Another genus of the 
Pteropod Mollusca, anatomized by Cuvier, 
embraces the Pneumoderma, which presents 
many peculiarities of structure, more es¬ 
pecially as relates to the position of the re¬ 
spiratory organs and the tentacula placed at 
the sides of the mouth and other anatomical 
details, so that it will require to be described 
at length. In this genus, the body is without 
a shell, having two fins situated on the sides 
of the neck, but is distinguished by having two 
bunches of tentacula in the vicinity of the 
mouth, and by carrying its branchial organs at 
the surface of its body near its posterior ex¬ 
The body of this mollusk is of an oval 
shape {fig. \ 15. 1, a), the head (5) is round, 
Fig. 115. (1 to 9). 
Anatomy of Pneumoderma. {After Cuvier.') 
1. Pneumoderma, natural size, anterior aspect. 
2. The same, posterior aspect. 
3. The same placed with the head downwards, 
and seen from the right side to show the branchiae. 
4. The same enlarged and shown in the position 
of fig. 1. The skin is divided and turned aside to 
show the muscular envelope of the viscera and the 
pericardium in situ. 
5. The same, the muscular envelope and perito¬ 
neum laid open to show the viscera in situ. 
6. The same, with the viscera developed. 
7. The same : the organs of generation are turned 
aside ; the stomach laid open and the integuments 
of the head divided to show the mouth and its ap¬ 
8. The mass of the mouth detached and opened 
longitudinally to show its interior. 
9. Interior of the head after the removal of the 
oral organs, showing the penis and the inferior 
ganglia in situ. 
The same letters answer to all the figures. 
a, body ; b, head ; c, mouth ; d, lips ; e, their 
fleshy appendage ; f fins ; g, branchiæ ; h, branchial 
vein ; i, auricle of heart ; k, pericardium ; 11, mus¬ 
cular envelope of viscera ; m, liver ; n, testicle ; o, 
ovary ; p, stomach laid open ; q, rectum ; r, r, fleshy 
appendages to oral cavity ; s, tongue ; t, u, anterior 
membranous compartment of mouth ; t, t, t, oral 
tubercles ; c, c, tentacles ; v, salivary glands ; x, their 
dilated ducts ; y, brain ; z, smaller mucous ganglia ; 
x, penis ; ß, opening of common generative canal.


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