CLARS I 



ECHINOIDEA 



295 



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



A C 



Hemipatagiis hofmanni Goldf. Oligocene ; 

 Doberg, near Bünde. A, Dorsal view. 

 B, Profile. C, Ventral aspect. i/i (after 

 Goldfuss). 



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

 in deep scrobicules. Periproct supra-marginal. Tertiary. 



Platyhrissus Grube. Recent. Palaeopneustes A. Ag. Recent, and perhaps 

 Eocene. 



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

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



Fio. 418. 



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

 and side views of test, Vi- ^. Pores of the anterior Amb. E, Peres of the paired Amb, enlarged. 



Fio. 419. 

 Linthia heberti Cotteau. Eocene ; Lonigo, near Vicenza. 3/^ 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 



