CLASS I ECHINOIDEA 295 



with small pores in a shallow furrow. Paired Amh long, petaloid, nearly 





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Ilemipiitagus hofmaiini Gold f. Oligocene ; 

 Doberg, near Biinde. A, Dorsal view. 

 B, Profile. C, V'entral a.speet. i/i (after 

 Qoldfu.ss). 



flush. The lateral lAmh with a few large perforate and crenulate tubercles 

 in deep scrobicules. Periproct supra-marginal. Tertiary. 



Flatybrissus Grube. Eecent. Falaeopneustes A. Ag. Recent, and perhaps 

 Eocene. 



Section B. Prymnadetes. Suhanal fasciole absent, other fascioles present. 

 Hemiaster Desor (Fig. 418). Anterior Amh in a shallow groove, the pores 



D 



<i 



a 



Fi<i. 418. 



Hemiaster orhignyanus Desor. Upper Cretaceous ; Martigues, Proveuee (after d'Orbigny). A-C, Ventral, dorsal 

 and side views of test, Vi- D, Pores of the anterior Amh. E, Pores of the paired Ami, enlarged. 



Pig. 419. 



Linthia hehcrti Cotteau. Eocene ; Lonigo, near Vicenza. Sj^ natural size (after Dames). 



oblique, and in pairs on either side. Antero-lateral Amh petaloid dorsally, 

 sunken, diverging, and much longer than the postero-lateral. Pores of the 



