1 24 STROA^G. [Vol. X. 



portion of his description. Schulze divides the roof of the 

 stomodaeo-pharyngeal cavity into five regions. These regions 

 are demarcated by certain folds and elevations or papillae. 

 The anterior region or field is that portion lying in front of the 

 transverse fold already mentioned; the middle field, free from 

 any high papillae, is bounded in front by the transverse fold, 

 laterally by a row of high papillae, and posteriorly by a fold. 

 On each side of it are the lateral fields characterized by the 

 presence of high papillae. The fold which forms the posterior 

 boundary of the middle and lateral fields has a scalloped out- 

 line and extends transversely across the cavity. Behind it is 

 the posterior field, in which the character of the epithelium 

 changes, being destitute of papillae and studded anteriorly 

 with "multicellular glands," as they are designated by Schulze. 

 Posteriorly this epithelium merges into the oesophageal epithe- 

 lium. The papillae are elevations of the epithelium, the 

 interior being composed of connective tissue, and they bear 

 one or more "taste bulbs." The latter are found as well 

 between the papillae, and also, according to my observations at 

 least, in the posterior field. The multicellular glands are com- 

 posed of a number of appressed elongated cells forming a cup- 

 shaped structure whose concavity forms a shallow depression 

 in the epithelial surface, and whose convexity projects slightly 

 into the subepithelial connective tissue. 



The floor of the stomodaeo-pharyngeal cavity is divided, 

 according to Schulze, into five similar regions, the rudiment of 

 the tongue marking the boundary between the anterior and 

 middle fields. Here also is a similar transverse scalloped fold 

 marking off the posterior field. In the posterior field the gill 

 cavity opens and is partly covered by the folds formed by the 

 posterior field, i.e., the anterior and posterior velar folds 

 (" Kiemendeckplatten "). On these folds the above mentioned 

 glands are so numerous that they form a continuous layer 

 without intervening indifferent epithelium, a condition which is 

 approached also on the posterior field of the roof in places. It 

 is on the edges and under side of the velar folds that these 

 glands are so numerous, and I may add, from my own observa- 

 tions, that those on the roof of the pharynx are so grouped as 



