HAPLODONTIDA—VISCERA OF HAPLODON RUFUS. 585 
hair extends some distance, upon modified papillate integument, well defined 
from the smooth naked mucous membrane proper. Near the angle of the 
mouth, on the upper lip, there is a curious patch of hair growing upon an 
island of papillate modified integument like that of the edges of the lips, but 
entirely separated by a strait of smooth mucous membrane. _ The roof of the 
mouth presents a singular series of elevations and depressions, very unlike the 
regular transverse ridges and lines of impression seen in many mammals. 
There is a smooth pad-like eminence just behind the superior incisors, con- 
stricted across the middle by an emargination on each side. Behind this 
is another larger prominence, constricted across the middle, with regular con- 
vex termination posteriorly, and jagged edges anteriorly, joined with the first 
pad by a narrow furrowed isthmus, but separated behind from succeeding 
elevations by a deep sulcus. These formations are all anterior to the molars ; 
the molar interspace, with a short interval anterior to these teeth, is wholly 
occupied by a series of paired prominences, or two rows of flattened oval 
papillee of large size, five or six pairs. These pads rise nearly to the level 
of the molar crowns.* 
The tongue is thick and fleshy, rounded at the end. Only a small por- 
tion is visible from the front, but the member is about two inches long, measured 
from tip to the epiglottis; it is nearly parallel-sided, and about one-third of an 
inch in breadth, the free portion. however, widening to half an inch or more. 
The dorsum of the tongue is thickly covered with papille of different kinds. 
Anteriorly, the papille are villous and innumerable; behind, these gradually 
change into flattened tubercle-like projections. The villous portion of the 
tongue shows a large number of ‘‘conical” papille, irregularly scattered, while 
posteriorly there are a few large and distinct ‘“ circumvallate” papillae. The 
pharynx is much contracted. A well-formed but soft and rather narrowly 
semilunar epiglottis guards the laryngeal orifice,. more complete closure 
during deglutition being apparently effected by a forward movement of the 
opposite side of the aperture. The rima glottidis is posteriorly a simple 
cleft, or chink, between the apposed arytenoids. 
There is a large hyoid bone, entirely osseous, excepting the glosso-hyal, 
which extends forward into the substance of the tongue asa gristly rod. The 
basi-hyal is broadly V-shaped, with an anterior protuberance beyond the 
angle of the V. There is no uro-hyal. A slender bony style, over half an inch 
*I do not know how much these appearances may be due to immersion in alcohol. In another 
specimen, the posterior part of the roof of the mouth is quite smooth. 
