OSTEOLOGY OP THE HYOPOTAMIM. 
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Fig. 7. Distal view of the unciform of Hyopotamus from Puy. 
in, iv, v, facets for the corresponding metacarpals. 
Figs. 8 & 8'. Front and distal view of the unciform of Biplopus, Hordwell. Mus. Cam- 
bridge. 
In, lunar facet ; py, pyramidal facet ; ill, v, facets for the two metacarpals. 
Fig. 9. An unciform of Hyopotamus from Hempstead. Fig. 9'. Distal view of the same. 
Smaller than the unciform from Puy. B.M. 
Fig. 10. Distal view of the cuboid of Hyopotamus, Puy. 
tr , transverse ridge ; iv, V, facets for the two corresponding metatarsals. 
Fig. 11. Distal view of the cuboid of Biplopus. B.M. 
f.my, facet for the fourth metatarsal on the posterior beak ; iv, facet for the 
single fourth metatarsal. 
Fig. 12. Another third metatarsal of Biplopus, without the rudiment of the second. 
All the hind feet are right ; the fore foot is left. 
PLATE XXXIX. 
Fig. 1. Cranium of the largest species of Hyopotamus, from Puy. Two thirds nat. 
size. 
Fig. 2. Side view of the head of a smaller Hyopotamus, from Puy. Nat. size. 
Fig. 3. Lower jaw of the same ; said to come from the same block. 
Fig. o'. Upper view of the anterior extremity of the lower jaw. 
Fig. 4. One molar (m 1 ) and three milk-molars of Hyopotamus, Puy. 
Fig. 5. Part of the head, from the postglenoid process to the occipital condyle. 
Fig. 6. Dorsal vertebra of Hyopotamus. 
Fig. 7. Second cervical vertebra of Hyopotamus, from Puy. Collection Pichot. 
Fig. 8. Left lower molar of Chalicotherium . Fig. 9. Anoplotlierium. Fig. 10. Bicho- 
bune bavarica, Fraas. Fig. 11. Hyopotamus. Fig. 12. Ruminant from Allier. 
ac, anterior crescent ; pc, posterior crescent ; ay, anterior pillar ; pp, posterior 
pillar. 
Fig. 13., Left upper molar of Rhagatlierium ; fig. 14 of Hyopotamus Gresslyi. Fig. 
15. Intermediate form between the Hyopotamus and Bicliodon ; the anterior 
middle (fifth), lobe is coalesced with the internal. Fig. 16. Hichodon, from 
Mauremont. 
el, external anterior lobe; ml, middle anterior lobe; il, internal anterior lobe. 
The teeth (figs. 13, 14, 15) have the three lobes on the fore part of the tooth. 
Fig. 17. Left upper molar of Bichobune leporina, Cuv. ; and fig. 18 of Cainotherium: 
the three lobes are on the posterior part of the tooth. 
Fig. 18. The so-called Cainotherium ( Hyopotamus ) Renevieri, Piet., having, like all the 
other Hyopotamidee , the three lobes on the anterior part of the tooth. 
