EXPLANATION OF THE PLATES. 



PLATE Page 



I.— Fig. 1, 2. Skull. Tatusiapeba 13 



„ 3, 4. ,, ,, leptorliynclms 15 



II. — Fig. 1, 2. ,, Tatusia granadiaua 14 



,, 3, 4. ,, ,, mexicana 14 



III. — Fig. 1, 2. ,, Tatusia brevirostris 15 



,, 3, 4. ,, ,, boliviensis 16 



IV.— Fig. 1, 2, 3. „ Praopus Kappleri 16 



V. — Fig. 1, 2. ,, Clisetopliractus vellerosus 19 



,, 3,4. ,, Tatusia leptocepliala 16 



VI. — Fig. 1, 2. ,, Cliaetopliractus villosus 18 



,, 3,4. ,, Dasypus sexcinctus 18 



VII.— Fig. 1, 2. „ Xenm-us latii-ostris 22 



,, 3,4. ,, Zipliila lugubris 23 



VIII. — Fig. 1. Head-sliields. Xenurus unicinctus 21 



,, 2. ,, ,, latirostris 22 



,, 3,4. ,, Zipliila lugubris 23 



, , 5 . , , Cheloniscus tricinctus 24 



IX. — Skeleton. Tolypeutes conui'us 24 



X. — Fig. 1. Skeleton. Euliyrax abyssinicus 42 



,, 2. ,, Hyrax Bnicei 40 



XI. — Fig. 1. Skull. Hyrax ferrugineus 42 



,, 2. ,, Euliyrax Bocagei 43 



,, 3. ,, Dendroliyrax Blain\illei 44 



XII. — Fig. 1. ,, Dendrohyrax dorsalis (very young) 43 



,,2. ,, ,, seraicircularis (very young) 44 



„ 3. ,, Hyrax irrorata 42 



XIII. — Fig. 1. ,, Dendrohyrax dorsalis 43 



,, 2. ,, ,, arboreus 44 



XIV. — Skull. Eliinoceros unicornis 46 



XV. — , , Rhinoceros unicornis (very young) 46 



XVI. — ,, Rhinaster bicornis 51 



XVII. — ,, Rhinaster bicornis 51 



XVIII. — ,, Rhinaster bicornis (very young) 51 



XIX. — ,, Ceratorhinus niger 48 



XX. — ,, Ceratorhinus sumatranus 47 



XXI. — ,, Ceratotheriuni siniuni 52 



XXII. — ,, Ceratotheriuni siniuni (young) 52 



XXIIIa. — ,, Notophorus"^ torquatus 53 



* The nasal cavity of this genus is very complicated. It has a large maxillary 

 palatine sinus, occupyiug the whole length and breadth of the palate, with 

 a large opening on each side the vomer in front, just within the interior 

 nostrils, separated from the upper nasal cavity by a regularly arched bony 

 lamina. The pair of nasal cavities separated by a large well-developed bony 



