117 



Breyn, in Schediasm. de Echinis, reduced the number 

 of genera to seven, forming them upon the situations of the 

 mouth and vent, and assuming, for his groundwork, the sec- 

 tions of Klein as genera. 



Genus 



1. Echinometra Cidaris of Klein. 



2. Echinoconus Fibula of ditto. 



3. Echinocorys Cassis of ditto. 



4. Echinanthus Scutum of ditto. 



o. Echinospatagus Spatangus and Spatagoides of ditto. 



6. Echinobrissus Brissus and Brissoides of ditto. 



7. Echinodiscus Placenta and Arachnoides of ditto. 



Van Phelsum, adopting almost the whole of the genera 

 suggested by Klein, and being under the necessity of 

 forming new ones, rendered his classification too extensive, 

 forming them into twenty genera. 



Genus 



1. Echinus Cid. Miliaris, Klein. 



2. Echinometra Cid. Variolataand Mammillaris, ditto. 



3. Echinosinus Clipeus, ditto. 



4. Echinites Conulus, ditto. 



5. Echinoneus 



6. Echinodiscoides Discoides, ditto. 



7. Echinodiscus Laganum, ditto. 



8. Echinoplacos Mellita, ditto. 



9. Echinocyamus 



10. Echinus salinaris. . . . Galea and Galeola, ditto. 



11. Echinus pelagius .... Galea, ditto. 



12. Echinomitra Conulus, apice obtuso, ditto. 



13. Echinanthus Scutum, ditto 



14. Echinorodum Scutum, ditto. 



15. Arachnoides 



16. Amygdala Brissoides, ditto. 



17. Ova Brissoides, ditto. 



18. Nuces Brissus, ditto. 



19. Campana Spatangus, ditto. 



20. Echinocardium Spatangus and Spatagoides, ditto. 



Aided by these labours, N. G. Leske, Professor of 

 Natural History at Leipsic, in his Additamenta ad Jacobi 

 Theodori Klein, Nataralem Dispositionem Echinodermatum, 

 &c. formed the following arrangement of these animals, 

 which was published in 1778 : 



