OSTEOLOGY AND DENTITION OF HYLOMYS. 467 
Tupaia, however much in general form it resembles the last-named genus, from which 
it is widely separated in the details of its structure. Witness how different the pterygoid 
region of the skull is from that which occurs in 7wpaia, and in contrast to the characters 
of which may be enumerated its imperfect tympanic bulle, its slightly excavated basi- 
sphenoid, its paroccipital and mastoid processes, the imperfect orbit, the ridge before 
the latter, the imperforate malar, the palate without defects of ossification, and its 
dentition—besides other details of its skull, all of which, along with the foregoing, 
demonstrate that its nearest affinity is with Gymnura, and through Gymaura with 
Erinaceus. Added to these are the characters of its scapula and pelvis, which resemble 
the corresponding structures in Gymnura; and, like the latter, Hylomys has the 
important feature of a united tibia and fibula. 
It is to be regretted that the viscera had been removed from Blyth’s specimens when 
they were originally preserved, and that those of my specimens had been entirely 
destroyed by insects; otherwise these remarks might have been supplemented by the 
characters of the digestive tube. 
DESCRIPTION OF THE PLATE. 
PLATE LXIV. 
Fig. 1. Side view of head of spirit specimen of H. peguensis, Blyth. 
Fig. 2. Inferior view of skull. 
Fig. 3. Upper view of skull. 
Fig. 4. Side view of skull and mandible. 
Fig. 5. Side view of teeth of upper jaw (twice nat. size). 
Fig. 6. Teeth of upper jaw seen from below (twice nat. size). 
Fig. T. Teeth of lower jaw seen from above (twice nat. size). 
Fig. 8. Skeleton (nat. size), H. peguensis, Blyth. 
Fig. 9. Tenth dorsal to fifth lumbar vertebra (twice nat. size). 
Fig. 10. Upper surface of atlas. 
Fig. 11. Side view of axis. 
Fig. 
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- Dorsal view of axis. 
Fig. 13. Left scapula. 
Fig. 14. Right humerus. 
Fig. 15. Right radius and ulna. 
Fig. 16. Left os innominatum. 
Fig. 17. Right femur. 
Fig. 18. Right tibia and fibula. 
Fig. 19. Sternum. 
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