Clark. — The Echiuoderms of Peru. 



PLATE 3. 



Fig. 1. Parasterina obesa. Talcahuano, Chile. Upper surface. X %■ 

 Fig. 2. Parasterina obesa. Talcahuano, Chile. Lower surface. X §• 

 Fig. 3. Paulia horrida. Galapagos Islands. Upper surface. X f  



