52 
Proceedings of Royal Society of Edinhurgh. [sess. 
were occupied by a finer mesliwork of folds. Projecting into the 
compartment from the wall, where a constriction on the exterior 
marked the change in the direction of this compartment, was a 
broad fold, the free edge of which was crescentic. I am not dis- 
posed to regard it as a septum dividing this compartment into two, 
but only as a fold corresponding with the change of direction in the 
compartment, for the mucous lining had a similar reticulated 
Fig. 4. — Stomach of B. rostrata, from a pen-and-ink drawing by H. G. Melville, M. B. 
Oe, CEsophagus; D, duodenum; S, spleen; 1-5, compartments of stomach. 
character on both aspects of the fold, and the aperture of com- 
munication between the two parts of this compartment was about 
a foot and a half in diameter. When vertical sections through the 
mucous membrane were examined microscopically, numerous tubular 
glands were seen in which the granular peptic cells characteristic of 
a true digestive chamber were contained. 
The presence of a small 3rd compartment between the 2nd 
and the large 4th compartment was so faintly indicated on the 
