414 



moidal part of the olfactory capsule is very extensive and complex. The turbinal is compa- 

 ratively simple. The turbinal plate of the nasal almost equals the facial plate in extent. Of 

 the nine teeth in each upper jaw the first is implanted in the premaxillary, and is to be re- 

 garded therefore as an incisor : the next represents a canine, and the remaining seven give 

 the normal numerical condition of the four premolars and three true molars : but these teeth 

 derive no specific or distinctive characters from form, structure, or mode of development. 

 They are without fangs, retain a wide basal pulp-cavity, or a persistent matrix, and conse- 

 quently enjoy perpetual growth ; they diminish in size towards the two ends of the series. 

 The lower jaw has ten of these teeth on each side, the two anterior being incisors by virtue 

 of their relative position to the first tooth above : the next, like a lower canine, is in advance 

 of the upp6r one when the mouth is closed, and thus the number of teeth, answering to 

 premolars and molars in the normal dentition, is again repeated in the lower jaw. The teeth 

 are removed and separately displayed from the left side of both upper and lower jaws. The 

 constituent bones of the cranium are numbered on coloured labels according to the TABLE OF 

 SYNONYMS. 



Presented by Prof. Owen, F.E.S. 



2293. The bones of the fore-foot of the Dasypus sexcinctus, naturally articulated. 



Presented by Prof. Owen, F.R.S. 



2294. The bones of the right hind-foot of the same Dasypus sexcinctus, naturally 

 articulated. 



The scaphoid not only sends downwards a compressed subelongate process to the under 

 part of the tarsus, answering to that which is so conspicuous in the Rodents, but also sends 

 inwards a large, obtuse, prominent process, occupying the interspace between the entocunei- 

 form and astragalus, where the accessory tarsal ossicle is formed in most Rodents. 



Presented by Prof. Owen, F.R.S. 



2295. The osseous tessellated casque or helmet formed by the exoskeleton of the 

 head (Dasypm sexcinctus). Presented by Prof. Owen, F.R.S. 



2296. The skeleton of the Nine-banded Armadillo (Dasypus Peba). 



The vertebral formula is : 7 cervical, 10 dorsal, 5 lumbar, 8 sacral, and 16 caudal. The 

 spine of the dentata is compressed, lofty, and developed backwards beyond those of the third 

 and fourth cervicals, with which it has partially coalesced : a corresponding partial coales- 

 cence has taken place between the bodies of these vertebrae, which are unusually broad and 

 flat below. The diapophysial part of the transverse processes of the last cervical extends 

 upwards, outwards and backwards, and abuts against the fore part of the tubercle of the first 

 broad dorsal rib : the pleurapophysial part of the same transverse process is broad and short, 

 and extends downwards in front of the same rib. The last three cervicals have no spinous 

 processes ; that of the first dorsal rises to a considerable height, and those of the remaining 

 dorsals and lumbar vertebrae attain the same horizontal line, except the last, which inclines 



