457 



2522. The skull of a female Narwhal (Monodon monoceros). 



The rudimental tusks, two in number, are exposed in their formative cavities, from which 

 they do not emerge in this sex. 



Hunterian. 



2523. The skull, wanting the lower jaw, of a large male Narwhal (Monodon mono- 

 ceros). 



The left tusk is developed in this sex to form the so-called ' horn.' The abortive right 

 tusk is displayed in its alveolus. 



This is the ordinary state of the dentition in the adult male, and it appears to have been 

 first described by Reisel, in the following passage : " In Musseo Stutgardiano cranii ejusmodi 

 mutilati superior sola pars hinc hide fracta, longa duobus ped. lata pede uno sine maxilla iii- 

 feriore, cum unicornu abrupto quidem, sed longo tamen adhuc tribus pedibus et unciis novem 

 supra radicem seu basin, qnse latebat in rostri sinistro processu seu alveo, longam pede uno et 

 unciis duabus, in dextro processu quoqne per rimam nescio sponte aut violenta aliqua fractura 

 hiscentem ostendat parvum ejusmodi cornu seu dentem longum ultra uncias octo, de cujns 

 successione, praesentia, ortu et generatione tacet Wormius. Conjicio enim succrescere illud 

 priori protenso longiori, si forte violentia aliqua, aut aetate, aut consuetudine, deciderit hasta 

 ilia ossea, vel si abruperit illam piscis, quod in glaciei ruptione hand rar6 contiugere obser- 

 vatum fuit." DR. D. SALOMOXIS REISELII, "De Unicornu Marino duplici," Miscellanea 

 Curiosa sive Ephemeridum, &c. 1702, p. 350. See also ' Odontography,' vol. i. p. 349. 



Hunterian. 



2524. The skull, wanting the lower jaw, of a male Narwhal (Monodon monoceros). 



Hunterian. 



* 



2525. The skull, wanting the exserted tusk and lower jaw, of a male Narwhal (Mo- 

 nodon monoceros). 



The left tusk is in this instance abortive : it is exposed, and has been longitudinally bi- 

 sected. 



Hunterian. 



2526. The lower jaw of a Narwhal (Monodon monoceros). Mus. Brit. 



2527. The left ramus of the lower jaw of a Narwhal (Monodon monoceros). 



Mus. Brit. 



2528. The tusk of a male Narwhal (Monodon monoceros). Hunterian. 



2529. The tusk of a male Narwhal (Monodon monoceros). Hunterian. 



SN 



