PLATE VII". 



Echinus microtuberculatus, /. 1, 2. 



1. Seen ill profile. 



2. Seen from the iibactinal imle. 



Echinus augulosus, /. ."?. 



3. Seen from alim-e. 



Echinus elegaus, /. J). 



4. Seen from aliove. 



Echinus acutus, /. 5. 



5. Seen in prolile. 



Echinus esculentus, /. 7. 



7. Seen from above, f nat. .size. 



Phymosoma crenulare, /. C, S, 0. 



6. Seen in profile. 



8. Seen from above. 



9. Seen from the aetinal side. 



(.4// Fir/s., except 7, natural she.) 



