POURTALESI^. 



12i 



a m 6 



b 5 a 



92 mm. 



Fig. 167. EcHiNocREPrs sktigera. 



92 nun. 



Fig. 1*58. Echinocrepi.s setiokk.\. 



a deep and long actinal groove in the extension of the anterior extremity 

 of the test. Tt is natural that with such extensive movements in the 

 coronal plates of the test we should find, as we do, such great differences 

 in the final position of the coronal plates in the Pourtalesioe as contrasted 

 to all other Echinoidea. 



6 la 6\- a 



IG mm. 



Fig. 109. Pouutalesia Tanxeri 



IT mm. 



Fig. 170. Pouktalesia Taxxebi. 



