578 



3486. The sixth cervical vertebra of a Llama. 



It shows the pleurapophyses, diapophyses, and the posterior descending pair of processes, 

 which resemble the hypapophyses in the lower cervical vertebrae of birds. 



3487. The last cervical vertebra of a Llama. 



The right transverse process is perforated by the canal for the vertebral artery. 



3488. The skeleton of the Paco or Guanacho, a variety of the Auchenia Llama 



The vertebral formula and other characters of the skeleton correspond with those of the 

 preceding. 



Mm. Brookes. 



3489. The skeleton of the Vicugna (Auchenia Vicugna}. 



The vertebral formula is : 7 cervical, 12 dorsal, 7 lumbar, 4 sacral, and 14 caudal, but pro- 

 bably one is wanting. Six pairs of ribs articulate directly with the sternum, which consists of 

 six bones. The vertebrae of the neck repeat the peculiarities noted in the other Camelidee, 

 but are proportionally longer and more slender : the sixth has the superadded processes upon 

 the back part of the centrum. The metapophysis passes upon the zygapophysis at the 

 eleventh dorsal : from the fourth to the tenth it is intermediate in position between this and 

 the diapophysis. The bones of the extremities repeat the peculiarities of the other Camelidee, 

 but the metacarpi and metatarsi are relatively longer and more slender. 



Purchased. 



Genus Moschus. 



3490. The skeleton of a male Musk-deer (Moschus moschiferus). 



The vertebral formula is : 7 cervical, 14 dorsal, 5 lumbar, 5 sacral, and 6 caudal. 



The atlas has a hypapophysis, but no neural spine. The transverse process is a broad thin 

 plate coextensive with the length of the vertebra : it is perforated transversely from the neural 

 canal outwards to beneath its base, for the exit of the nerve, and then vertically, by the ver- 

 tebral artery, which also perforates the neural arch. The axis has a sharp hypapophysial 

 ridge extending from below the base of the odontoid process to beyond the posterior surface 

 of the centrum, where it underlaps the next vertebra. A similar ridge and backwardly pro- 

 duced process are developed from the two succeeding cervicals, beyond which the ridge gra- 

 dually subsides to the seventh vertebra. From the third to the sixth cervical inclusive, the 

 pleurapophysial part of the transverse process equals or exceeds the length of the vertebra, 

 and those parts are arranged so as to overlap each other. 



There is a distinct, but less extensive, diapophysial portion projecting external to the ver- 

 tebral canal : this part alone represents the transverse process in the seventh cervical. The 

 spines of the third and seventh cervical vertebras are vertical, those of the intermediate ones 



