144 



Transactions. 



Fig. 2. 



Asteropais imperialis. 



Fig. 2. Abactinal surface of half a va,y (x 2) denuded of its skin, showing the 

 arrangement of the skeleton. The dotted areas are diagrammatic only, 

 for the purpose of showing up the plates more distinctly, c, connective ; 

 ce., central ; c.r., centro-radial ; d.l., dorso-lateral : t'.r., intei'radial ; rl, 

 l)rimary radial ; s.m., supra-marginal. 



Fig. :?. .\ctinal surface of half a ray (x 2). In the proximal region the paired 

 actinal ambulacral spines are inserted ; in the middle, both the furrow - 

 spines and the smgle actinals which are present here ; toward the distal 

 extremity the actinal spines are removed, and only the furrow-spines are 

 shown. ad., adambulacral ; a.s., actinal ambulacral spine ; /.«., furrow- 

 spine ; i.m., infra-marginal ; s.m., supra-marginal ; v.l., ventro-lateral. 



