SIWALIK MAMMALIA. 
19 
ADDENDUM. 
Genus. TETRACEROS, Leach. 1 
Distribution. — The genus is represented at the present day only by T. quadri- 
cornis ,* which occurs over the whole of India. 
Tetraceros daviesi, n. sp. nobis. 
Definition. — This species is slightly larger than Cephalophus madoqua, and 
distinguished from T. quadricornis by its inferior size, and the narrower anterior 
premolars. 
Cranium. — In the course of a recent examination of the duplicate Siwalik 
collection in the British Museum, Mr. W. Davies brought to light the middle portion 
of the cranium of a small ruminant which he at once recognized as new, and kindly 
handed over to the writer for description. The specimen (woodcut fig. 3) comprises 
Fig. 3. Tetraceros daviesi, Lyd. The right half of the middle portion of the cranium and of the palate ; from 
the Siwalik Hills. British Museum. (No. M. 3492). 
the portion of the cranium between the middle of the orbit and the posterior ex- 
tremity of the premaxilla, and indicates an animal slightly larger than the existing 
African Cephalopus madoqua , Gray ; the whole of the palate and cheek-dentition is 
preserved, but the crowns of some of the teeth (which are in an early stage of wear) 
are either broken off, or more or less damaged. All the teeth have high crowns, and 
the true molars are relatively wide, and have no internal accessory column. The 
fourth premolar has a very strongly-marked anterior costa, and the superior border 
of its inner crescent is incomplete anteriorly ; pm. 3 is much elongated, narrow 
transversely, with a very incomplete inner crescent, and only a small inner root ; 
the crown of pm. 2 is broken off, but the section of its base shows that this tooth 
was very long and narrow, and had no inner root. The palate is narrow and 
l ‘Trans. Linn. Soc.’ vol. xiv. p. 524 (1823). 2 The so-called T. quadricornutus is only a variety. 
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