680 



PROF. A. H. GARROD ON 



[June 18, 



tact, being situated laterally upon opposite sides of the gullet. These 

 areas are flat, except at their upper margins, where a small transverse 

 ridge is developed, which may be the slight foreshadowing of the 

 special cavity developed in Plotus anhinga for the reception of the 

 secretion of the gastric glands. But in P. levaillanti it is to be 

 noticed that there are two gland-surfaces, whilst in P. anhinga it 

 will be remembered there is but one gland-cavity. 



View of the inner surface of the posterior wall of the stomach of Plotus levail- 

 lanti, with the oesophagus slit up anteriorly so as to show the whole of its 

 proventricular surface, with the two gland-areas and the U-shaped elevation 

 on its anterior wall (on the left of the figure), as well as the pyloric 

 infundibuliform plug. 



The calibre of the oesophagus must be somewhat diminished by 

 the presence of a curious U-shaped ridge upon the mucous mem- 

 brane of its anterior wall, which is situated between the antero- 

 lateral margins of the gland-areas, and has a small pit in the part 



