1 86 TUCKERMAN: [Vol. IV. 



Gustatory Structures. 



The Ciraimvallate Papill(2. — The papillae are 0.90 mm. in 

 diameter and 0.45 mm. in height. The trenches are not deep, 

 and have a uniform breadth. Serous glands are very abundant, 

 and occur within the papillae themselves. The ducts open at or 

 near the bottom of the trenches. They are remarkably straight 

 and have a nearly uniform diameter. Some of them are quite 

 long, occasionally exceeding two millimetres in length. The 

 ducts of the intrapapillary glands pass through the epithelium 

 of the lateral wall and open about opposite the middle of the 

 trench. This being a young individual, the bulbs are present 

 on the upper surface as well as upon the sides of the papillae. 

 In one section I counted twelve on the upper area. The ar- 

 rangement of the tiers is very irregular. Isolated bulbs occur 

 on the outer wall of the trench, especially at its upper part. 

 The bulbs measure 0.054 mm. in length and 0.033 n^r"- i^^ 

 breadth. 



The lateral gustatory organs were represented by five or six 

 fairly symmetrical folds at the sides of the base of the tongue. 

 There were, however, no indications of bulbs, and serous glands 

 were likewise wanting in this region. 



The fungiform papillae were very well supplied with bulbs. 

 The epiglottis was not examined. 



The Tongue of PJioca vitulina. 



This tongue, of which I received a fresh specimen, was hard- 

 ened in Miiller's fluid and alcohol. 



General Description. — The tongue is 95 mm. in length, its 

 greatest transverse diameter is 51 mm., and it measures 30 mm. 

 in thickness. The organ possesses but little mobility, the free 

 portion being but 2 1 mm. in length, and there being but a small 

 extent of free margin. The tip is bifurcate, and fringed with 

 filiform papillae. There is a slight groove, 5 mm. long, on the 

 upper surface, and a narrower and much shallower one, 8 mm. 

 long, on the under surface. They both terminate at the tip. 



The anterior and middle portions of the dorsum are covered 

 with large, closely set, cornified papillae, the apices of which are 

 directed inwards and backwards. The mucous membrane of 

 the remaining portion of the dorsal surface is thrown into numer- 



