458 



2530. The tusk, longitudinally bisected, of a male Narwhal (Monodon monoceros). 



Hunterian. 



2531. The tusk of a large male Narwhal (Monodon monoceros), with a portion of its 

 alveolus. Hunterian. 



2532. One moiety of a longitudinally bisected tusk of a male Narwhal (Monodon 



monoceros) . Hunterian . 



2533. The tusk of a male Narwhal (Monodon monoceros). Hunterian. 



2534. One moiety of a longitudinally bisected and fractured tusk of a male Narwhal 

 (Monodon monoceros). Hunterian. 



2535. The tusk of a male Narwhal (Monodon monoceros). Hunterian. 



2536. The tusk of a male Narwhal (Monodon monoceros). 



Presented by Sir Charles Blicke. 



2537. Proximal portion of a tusk of a male Narwhal (Monodon monoceros). 



Hunterian. 



2538. The tusk of a male Narwhal (Monodon monoceros). Hunterian. 



2539. The tusk, with a portion of its alveolus, of a young male Narwhal (Monodon 

 monoceros). Hunterian. 



2540. The tusk of a male Narwhal (Monodon monoceros). Hunterian. 



2541. The abortive tusk of a Narwhal (Monodon monoceros). 



It presents, at its base, the shallow pulp-cavity, which has an oblique position, and is sur- 

 rounded by a thick margin, ragged from tubercles of cement : a similar tubercle occupies the 

 middle of the conical depression for the pulp. It is marked by longitudinal spiral ridges. 



Hunterian. 



2542. The abortive tusk of a Narwhal (M. monoceros). 



Presented by Henry Cline, Esq. 



