AUT. 13 ANATOMY OF CHINESE FINLESS PORPOISE HOWEUL. 41 



although the teeth had appeared above the oral membrane. Even 

 in old specimens, however, the teeth project above the gum to so 

 slight an extent that they can have but little more function than as 

 a slight aid to the holding of slippery prey. 



The tongue of the preserved specimens is hard, with a smooth, flat, 

 dorsal surface, an acute border, and somewhat wrinkled, vertical, 

 lateral portion. It is interesting to note that on the anterior part 

 of the acute border there is a well-developed row of papillae. These 

 seem to be softer than the remainder of the tongue and their function 

 is probably tactile. 



No dissection of the pharynx was made, but it was noted that the 

 epiglottis was of the type illustrated for Glohiocephala. 



The stomach is divided into four parts, but one of these is double 

 and so it might with almost equal propriety be considered as consist- 

 ing of five divisions. The esophagus enters the largest, which is 

 ovoid and about 112 mm. in length. The outer wall is tough and 

 rubbery with a uniform thickness of about one millimeter. The lin- 

 ing, which had peeled loose, was quite heavily plicated and most of 

 it was thin, but surrounding the constricted passage to the second 

 division it was gathered into heavy plicae with a thickness of more 

 than 5 mm. 



The second division was flat and somewhat kidney-shaped, meas- 

 uring 84 by 47 by 22 mm. in thicloiess. This was lined with ex- 

 tremely heavy, chocolate-colored ridges running lengthwise, these 

 having short rugosities projecting laterad and interdigitating in a 

 regular manner with similar rugosities from the adjoining ridges. 

 At two thirds the distance to the base of this division and hidden 

 between two of the heavy folds is a constricted passage to the third 

 division. In the preserved specimen this had a width not greater 

 than 2 mm. From the second division this passage is absolutely un- 

 diiferentiated and in spite of careful search it was only by dissect- 

 ing from the third division that its existence could be demonstrated. 

 The condition of the surrounding parts indicates that the passage 

 is not much, if at all, extensible; and yet it must be, for otherwise 

 the food of the animal would of necessity be limited to such items 

 as the smallest crustaceans, and this, according to the authority of 

 published statements, is not the case. 



The third division is double, being somewhat V-shaped with 

 smooth, rubbery lining, each part being about 44 mm. in length, 

 the two being separated by an oval constriction some 10 mm. in 

 greatest diameter. 



The fourth division was similar in size and character to one-half 

 of the third and was separated from the latter by another oval con- 

 striction, this being but 5 mm. in greatest diameter. 



