317 



the large T-shaped episternum, the ootfied bannapopbyse* separated by cartilages from thr 

 pleurapophyses, the spur-like appendages of the tarsi, and the inferior spine* developed from 

 the four anterior dorsals, are all singular instances of resemblance to the skeletons of the ovi- 

 parous Vertebrate*. 



Presented by William Clift, Esq., F.R.S. 



1 700. The skeleton of a male Ornithorhynehu* paradox**, with the tegumentary 

 parts of the beak and of the digits. The relations of the clavicles to the epi- 

 sternum are well shown in this skeleton. Mat. So*th. 



1701. The skull of the Ornilhorhynchus paradox**. It shows well the prenasal 

 ossicle, developed in the anterior part of the cartilaginous septum of the now. 



Presented by Sir Everard Home, Bart., r.P.RJL 



1702. The skull of the OrnHhorhynchn paradox**. A portion of the right side of 

 this cranium has been removed, to exhibit the cavity and the partial ossifica- 

 tion of the falx, which is natural in this species). 



Presented by Sir Everard Home, Bart., F.P.R.S. 



1703. The skull of an Ornithorhyncli*s paradox**. A vertical section has been taken 

 transversely in front of the orbits, showing the large, complex and delicate 

 turbinal bones, and the wide canals for the transmission of the huge trigemi- 

 nal nerves to the integuments of the beak. 



Prepared from a specimen presented by Dr. Hobson. 



Genus Echidna. 



1704. The skeleton of the Spiny Platypus (Echidna Histrue). 



The jaws in this species are ulrndrr and elongated, and wholly edentulous : the prrmaxil- 

 laries diverge from their base, curve inwards towards each other, and meet to circumscribe 

 the external nostrils. The cranium is smooth and devoid of ridges and processes, but thr 

 sutures continue longer than in thr Omitkorkymcktu. In this young bat newly full-grown 

 specimen the pleurapophyses are wanting in all the cervical vertebra?, not having become 

 anchyloaed. There are 16 dorsal vertebra*, which resemble in their modifications those of 

 the rialyfnu, 3 lumbar, 3 sacral, and 12 caudal vertebra*. The scapula) are vertical, 

 but broader than in the Platyptu : the coracoids are still disunited from them, and are com- 

 plete, articulating with the sternum and episternom ; they also support epicoracoids. The 

 distinction of the clavicles from the anterior transverse bar of the episternum is here well 



