104 



Family Rhinobatida. 



496. The maxillary and mandibular arches of the Rhina, showing the quincuncial 

 pavement of obtuse, striated denticles covering the alveolar tract of the jaws, 

 and characteristic of this genus. Hunterian. 



Family Raiidee. 



497. The skeleton of a Homelyn or Sand-Ray (Raia maculata). The skin has been 



left upon the dorsal aspect. Purchased. 



498. The skeleton of a large male Skate (Raia Batis), showing the cartilaginous 



supports of the claspers continued from the hinder margin of the ventral fins 



Hunterian. 



499. The skeleton of a small male Skate (Raia Satis). Hunterian. 



500. The skeleton of a large female Skate (Raia Batis). Mm. South. 



501. The skeleton of a female Skate (Raia Batis). 



Presented by Joseph Henry Green, Esq., F.R.S. 



In all these specimens may be noticed the confluence of the anterior vertebrae of the trunk 

 and the adhesion of the scapular arch to the continuous spinous ridge of those vertebrae. 



502. The cranium with the branchial arches and anterior coalesced abdominal ver- 



tebrae of a Skate (Raia Batis). 



The hyoidean arch is extremely slender, is suspended from the back part of the proximal 

 end of the tympanic pedicle, and is attached lower down to the first branchial arch. 

 The rostral process of the cranium is much prolonged. 



Presented by Sir B. C. Brodie, Bart., F.R.S. 



503. The cranium with the anterior coalesced and some of the free vertebrae, and 



with the maxillary, mandibular, hyoidean, and scapular arches of a small 

 Ray (Raia maculata). Presented by Sir B. C. Brodie, Bart., F.R.S. 



