XII LIST OF ILLUSTRATIONS 



Facing page 



4. Blue whale: Anterior aspect of atlas 4 



5. Blue whale : Anterior aspect of axis 4 



6. Blue whale: Outer aspect of sternum 4 



7. Blue whale : Outer aspect of right scapula 4 



8. Blue whale: Inner aspect of left fore limb 4 



9. Blue whale: Pelvic elements 4 



A SECOND INSTANCE OF THE DEVELOPMENT OF RODENT-LIKE INCISORS 

 IN AN ArTIODACTYL 



By Gerrit S. Miller, jr. 



1. Incisor teeth of Vicunia (1-9) and Guanaco (10-15) — '- 4 



A Pollack whale from Florida presented to the National Museum 

 BY THE Miami Aquarium Association 



By Gerrit S. Miller, jr. 



1. Pollack whale: Skull from above 16 



2. Pollack whale: Skull from below 16 



3. Pollack whale: Skull from the side 16 



4. Pollack whale : Oblique view of braincase 16 



5. Pollack whale: Cervical vertebrae Nos. 1, 2, and 3 16 



6. Pollack whale: Cervical vertebrae Nos. 4, 5, and 6 16 



7. Pollack whale: Cervical vertebra No. 7 and dorsal vertebra No. 1 — 16 



8. Pollack whale: Cervical vertebrae Nos. 4, 5, 6, and 7; dorsal vertebra 



No. 1 16 



9. Pollack whale: Cervical vertebra No. 6 16 



10. Pollack whale: Dorsal vertebra No. 1 16 



11. Pollack whale: Cervical vertebra No. 6 and dorsal vertebra No. 1 16 



12. Pollack whale: Dorsal vertebrae Nos. 2-14 and lumbar vertebrae 



Nos. 1-5 16 



13. Pollack whale: Lumbar vertebrae Nos. 6-13 and caudal vertebrae 



Nos. 1-19 16 



14. Pollack whale: Lumbar vertebra No. 1 and caudal vertebra No. 1 16 



15. Pollack whale: Lumber vertebra No. 1 and caudal vertebra No. 1 16 



16. Pollack whale: Right ribs 16 



17. PoUack whale: Right scapula 16 



18. Pollack whale: Sternum, stylohyal, and basihyal 16 



19. Pollack whale: Jugal and forearm 16 



20. Pollack whale : Bones of the hand 16 



21. Pollack whale: Lacrimals and baleen plate from near middle of series __ 16 



22. Pollack whale: Tympanic and periotic bones 16 



Notes on oriental dragonflies of the genus Aciagrion 

 By Frank Fortescue Laidlaw 



1. Details of dragonflies of the genus Aciagrion 10 



A new species of round worm op the genus Trichostrongylus 



from the rabbit 



By H. W. Gray bill 



1. Trichostrongylus ajjinis, new species 2 



