PLEIOCENE FOSSILS. 



PLATE HI. 



ECHINODERMATA. 



Fig. 1. BKISSTTS SPATIOSUS. Upper view of cast. 



" la. A Breastplate, with part of the hinder ambulacrum of the left side. 



" lb. Enlarged knops, with their characteristic pentagonal shields from the lower surface. 



" 1c. Profile view of another knop of the same kind. 



" 2. PLAGIONOTUS HOLMESH. Lower part of the hinder half-row from the right ambula- 

 crum of the forward pair, with forward half-row of the interambulacrum immediately 

 behind. 



" 2a. Breastplate nearly entire. 



" 3. PLAGICMOTUS KAVEWELIANUS. The part of this species corresponding to fig. 2a of P. 

 Holmesii, but more perfect. It will be observed that the Belt-bearing plate is without 

 any row of great knops. 



" 3a. Imperfect Breastplate. 



