190 



MR. J. W. CLARK ON THE VISCERAL 



[Feb. 20, 



valve (marked E), which extends along the posterior side of the 

 division A till it meets the partition dividing this portion of the 

 stomach from that which succeeds (C). From the point where these 

 folds touch the edge of the valve a second set are given off, which 

 seem to conduct the food into the division C. There is a second 

 valve, or rather partition, as seen in the figure, extending down the 

 whole length of this sac almost to its apex, and dividing it nearly 

 equally. Its course may be traced externally by a depression on the 

 outside of the stomach, from the point F along the dark line which 

 curves round the cardiac end in fig. 3. The partition between A 

 and C is designated by the letter G. 



Fig. 4. 



A 



Posterior aspect of the same parts, of the same size. 

 A,B,C,D. The four divisions in order. H. Passage between divisions C and D. 

 The dotted lines on divisions A and B. indicate the extent of the aperture 

 cut in their walls to show their internal structure. 



The division B is not subdivided by valves of any kind. Its walls 

 are thick ; nearly g", and the villi are very large and coarse, disposed 

 along lines which take the direction shown in fig. 5. 



The passage from A to C is narrowed by a partition (G) to £" in 

 height. The compartment C is crossed obliquely by eight transverse 

 partitions extending round the lower half of its diameter. The number 

 of these varies: Gratiolet's specimen had nine, Dr. Crisp's seven. 

 Of these, six only are visible on the exterior. The first is attached 

 to the partition dividing this portion from A ; and the last is very 

 small, and within the passage leading to D. They are of no great 



