594 PROCEEDINGS OF THE NATIONAL MUSEUM. vol, xxxii. 



EXPLANATION OF PLATES. 



' Plates LIV, LV, and LVI. 



Dorsal, lateral, and ventral views of skulls of Old World porcupines. All figures 

 one-half natural size. 



Fig. \. Thecurus sumatnr. Type, Cat. No. 143482, U.S.N.M., Aru l>ay, Sumatra. 



2. Atherurus terutaus. Type, Cat. .No. 123971, U.S.N.M., Pulo Terutau, west 



coast Malay Peninsula. 



3. Trichys macrotis. Type, Cat. No. 114488, U.S.N.M., Tapanuli P>ay, Sumatra. 



4. Ilystrix cridata. Cat. No. p^,-, U.S.N.M., received from National Zoological 



60048 



Park. 



5. Acanthimi. hnicliiiurum. Cat. No. 83519, U.S.N.M., Trong, Lower Siam. 



Plate LVII. 



Tail bristles and cervical and lumbar vertebrae of Malayan porcupines. All figures 

 three-fourths natural size. 



Fig. 1. Tail bristle of vlr((u</(/o//. 



2. Tail l)ristles of Thecurus. 



3. Tail bristle of Atherurus. 



4. Tail bristle of Trichys. 



5. Axis or second cervical vertebra of Trichys. 



6. Lumbar vertebra of Trichys. 



7. Axis or second cervical vertebra of Allnrunis. 



8. Lumbar vertebra of AfJterurus. 



9. Axis or second cervical vertebra of 'J'liceurus. 

 JO. Lumbar vertebra of Thecurus. 



11. Axis or second cervical vertebra of Acantltiuii. 



12. Lumbar vertebra of Acanthion. 



