1S4 



ECHINIDjE. 



A Table showing the Classification of the ECHINIDjE. 



Family. 



Sections. 



Diagnosis. 



Genera. 



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' Inter-ambnlacra with irregular sculptured plates on the upper 



surface of the test. 

 Upper surface of both areas finely plaited ; large tubercles at 



the base only ; mouth small. 

 Plates of both areas with pyriform depressions in a portion 



of the line of the sutures ; ambulacra wide. 

 Plates with deep depressions along the whole line of the 



sutures ; ambulacra narrow ; mouth small. 

 Numerous small, equal-sized tubercles in both areas ; two rows "1 



in the ambulacra, and four to ten in the inter-ambulacra. 

 Surface granular, with numerous small, close-set tubercles ; 



mouth small; peristome feebly indented. 

 Inter-ambulacra lobed, with numerous small, close-set tuber- 

 cles ; mouth large ; peristome pentagonal. 



L Codiopsis, Agassis. 

 V Temnechinus, Forbes. 

 L Opechinus, Desor. 



Echinocidaris, Desmoulitis. 

 > Cottaldia, Desor. 

 I Magnotia, Michelin. 



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Mespilia, Desor. 



^-Both areas naked in the middle, tubercles on the sides, with 

 sutural pores, and a tuberculous base. 

 Tubercles numerous, equal-sized, sporadic ; inter-ambulacra ~| 



with naked horizontal spaces in the line of the sutures ; > Microcyphus, Agassiz. 

 angular pores. J 



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/-Tubercles small, limited to the sides of the areas ; test globu- 

 lar, with a very small pentagonal mouth. 



Tubercles small, numerous, equal-sized, in vertical and hori- 1 

 zontal rows ; larger at the base ; mouth large, pentagonal. 



Tubercles numerous, in many unequal, vertical rows ; mouth 

 moderate ; peristome feebly notched. 



Tubercles numerous, same size in both areas ; mouth small ; 1 



peristome with deep, narrow slits. J Echinus, Linncens. 



Tubercles unequal, two or more rows in each area, with seconda- 

 ries ; mouth very large, pentagonal, with wide, deep notches. 



L Codechinus, Desor. 

 Polycyphus, Agassiz. 

 Psammechinus, Agassiz. 



Stomechinus, Desor. 



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^ Tubercles small, irregular, sporadic ; middle of the ambulacra 1 



naked ; pores at the angles of the plates. j Amblypneustes, Agassiz 



Tubercles small, numerous ; the inner row of pores se- l 



parated from the two outer rows by a line of tubercles. J BoLETIA > Desor. 

 Tubercles not prominent ; the outer and inner rows of pores i 



rectilinear and regular, the middle row irregular. f Tripneustes, Agassiz. 





