On a new Porcupine from East Africa. 



229 



separated from those on the right by a dasli, the cross indi- 

 cating a gap between tlie thoracic and caudal sliields. 



The first group represents G. trachurus^ witli an uninter- 

 rupted series of shields from the shoulder to the end of the tail ; 

 the third the G. senna nnaf us, with a naked gap between the 

 thoracic shields and the caudals ; the iifth the G. gymnurus, 

 with the tail completely naked; whilst the second and fourth 

 groups are of special interest as comprising individuals which 

 belong to two different forms, according to whether the right 

 or the left side is examined. It will be observed that the 

 intermediate specimens {G. semiarmatus) are the most 

 numerous. 



1. 32—31. 



2. 30—30. 



3. 30—29. 

 4-6. 29—29. 

 7,8. 28—29. 



9-13. 29—28. 



14-16. 28—28. 



II. 



17. 18-1-7—30. 



18. 30-12-1-10. 



19. 13-1-7—29. 



20. 28—17+10. 



21. 28—14+6. 



III. 



22. 19+7—17+8. 



23. 17 + 7—19+7. 



24. 17+6—18+6. 



25. 18+7—16+7. 



26. 14 + 1+G— 18+6. 



27. 11+7—17+7. 



28. 16+8-16+5. 



29. 16+8—15+7. 



30. 15+5—16+6. 



31. 15+8—15+8. 



32. 14+7—15+7. 



33. 10+2+4—15+3. 



34. 14+6—14+6. 



35. 14+2—14+3. 



36. 14+7—13+7. 



37. 14+7—13+7. 



38. 14+7—11+7. 



39. 12 + 8—13+7. 



40. 13+7—12+6. 



41. 12+6—12+7. 



42. 12+7—11+6. 



43. 12+6—11+7. 



44. 11 + 8—11+7. 



45. 10+5—11 + 5. 



46. 10+6—10+6. 



47. 9+7—10+7. 



48. 8+2—8+3. 



49. 7+0—7 + 6. 

 60. 6+4—7+4. 



IV. 



51. 9+3—9. 



V. 



62. 12—12. 



53,54. 10—10. 



65,56. 7—7. 



67. 7—6. 



58,59. G— 7. 



60. 5—7. 



61-64. 6—6. 



65. 6—5. 



66. 4—4. 



XXXVIIT. — Description of a New Porcupine from East 

 Africa. By Oldfield Thomas. 



Mr. F. J. Jackson, the discoverer of so many new East- 

 African mammals, picked up on the beach at Lamu the skull 

 of a porcupine which, on comparison, appears to me to differ 

 Ann. & Mag. N. Hist. Ser. 6. Vol. xi. 17 



