328 PROF. HUXLEY ON ARCTOCEBUS CALABARENSIS. [June 28 
(Eenige Vergelijkend-ontleedkundige Aanteekeningen over den Oto- 
licnus Peli, p. 32). 
The tongue, long and narrow, is marked by depressions corre- 
sponding with the palatine ridges. At its base, as in most Lemurs, 
are three circumvallate papille, arranged in a V7, the apex of which 
is directed backwards. Under the tongue is the characteristically 
Lemurine sublingua, a broad, lyre-shaped plate, 0°35 inch long, by 
0:2 inch wide at its truncated free end*. The under surface of this 
plate presents a median keel, on each side of which is a furrow. 
The keel ends in a sharp point in the middle of the free edge, the 
lateral halves of which are also serrated, each exhibiting three or four 
points. 
The mucous membrane of the floor of the mouth, between the 
tongue and the mandibular rami, is raised into two sharp ridges with 
undulating edges; and these end in front in two pointed free pro- 
cesses, one on each side of the freenum. 
In the Potto, Van der Hoeven (J. c. p. 48) describes a very similar 
appendage beneath the sublingua, and states that the ducts of the 
submaxillary and sublingual glands open on its free edge, whence he 
has no doubt that it answers to the caruncula lingue. Burmeister, 
in Tarsius (1. c. p. 106), describes what seems to correspond to the 
sublingua (mihi) as the “ Lytta,’”’ and that which appears to answer 
to the second appendage as “ Unterzunge.” 
There is no uvula. The tonsils are well developed ; the epiglottis 
projecting, and shaped like the broad end of a shoeing-horn. 
The distance from the lips to the cardiac orifice of the stomach is, 
measured in a straight line, 5 inches. 
Fig. 8. 
The stomach, with the cesophagus (@), the duodenum (D), the pancreas (P), and 
the spleen (Sp) of the Angwantibo. Nat. size. 
_* It is therefore somewhat larger in all its dimensions than in Dr. Smith’s spe- 
cimen. 
