3 22 



THE ECHINOIDEA 



Dune. ; Palaeobrissus, A. Ag. ; Palaeopneustes, A. Ag. ; Platybrissus, Grube ; 

 Spatagocystis, A. Ag. ; Toxaster, Ag. SECTION 2. PRYMNADETINAE. Spa- 



Fia. XIJI. 



Brissopsis lyrifera, Forbes, sp., showing podia in action, and peripetalous fascicle. 

 (After Loven). 



Fio. XLIII. 

 Hemiaster Philippii, with young echinoids in the marsupia. (After Wyville Thomson.) 



tangidae with fascicles, but no subanal fascicle. Genera Abatus, Desor ; 

 Aceste and Aerope, Wyv. Thorns. ; Agassizia, Valentin ; Brissopsis, Ag. 

 (Fig. XLII.); Coraster, Cott. ; Dipneustes, Cott. ; Faorina, Gray; Hemi- 



