166 W. Lilljeborg on the Genera Peltogaster and Liriope. 
areolar tissue; this lines the internal cavity, and consequently 
embraces the ovaries. It is probably this membrane that Rathke 
regards as a stomach (ventricule) ; and when he found eggs in it, 
he was led to believe that the stomach of these animals also 
performed the function of a matrix. 
The two parts which both Rathke and the autliee regard as 
male organs (vesicule seminales?) form, in Peltogaster sulcatus, 
opake sacs filled with a cellular matter and furnished with a 
long neck (figs. 10a & 11). This neck is fixed, beneath and to 
one side of the primary ovaries, to the inner surface of the lining 
membrane of the body-cavity. These parts are attached beneath 
the organ of adhesion, as mentioned by Rathke. Their cecal ex- 
tremities are directed forwards, as described by Rathke. As the 
author’s specimens were preserved in spirit, he could not ascer- 
tain whether these sacs contained spermatozoids. He hints that 
they may be cement-glands, but, as they do not appear to be 
connected with the ovaries, from which, as asserted by Darwin, 
the cement-glands originate, and as he could not discover any 
connexion between them and the organ of adhesion, which ought 
to be formed by their secretion, he does not regard this function 
as probable. That Peltogaster possesses cement-glands is indi- 
cated by the structure of its organ of adhesion and the mode in 
which this organ is fixed to the skin of the abdomen of the 
Pagurus. On comparing the dilated disk of Peltogaster Pa- 
guri (fig. 8) with that of the basal membrane of Coronula 
balenaris figured by Darwin (Mon. Cirrip. ii. pl. 28. fig. 1 a), 
there appears to be a considerable resemblance between them. 
The margins of the organ of adhesion are more or less united to 
the skin of the Pagurus, so that, in separating them, fragments 
of the skin, or at least of the epidermis, remain attached to the 
margins of the organ*. 
The ovaries at first present the appearance of two sacs placed 
very close together; they are elongated, opake, and a little 
thickened behind (Pl. IV. fig. 9). They are situated on the 
inferior wall of the body-cavity, immediately behind the organ 
of adhesion, upon the tegumentary membrane, which is much 
thicker in this spot. They are separately enveloped by a cellular 
membrane with different formative materials. Their walls are 
thick and opake. The structure of the contents is acinose. 
When compressed and magnified 200 diameters, the ovules, with 
their germinal vesicle, are clearly seen enveloped in a tenacious 
matter, which is probably a future cement, as this, according to 
Darwin, issues in a similar form from the primitive ovaries of 
* According to Darwin, the cement of Coronula balenaris penetrates the 
epidermis of the Whales, and becomes confounded therewith in the way 
above described. 
