4«2 GEOLOGICAL MEMOIRS. 



Plate IV. 



Figure 1. Caryocrinites ornatus. The separate plates detached to exhibit 

 the law of their arrangement. 



a. Mouth. 



c. Attachment of the stem. 



€. Single arms. 



f. Pairs of arms. 



p. Basal plates. 



Pi. Small four-sided plates. 



P2. Large five-sided compound plates. 



q. Lateral plates. 



Qx. Hexagonal plates leading to, and opposite, the mouth. 

 g^. Pentagonal plates. 

 5-3. Heptagonal plates. 



r. Scapular plates. 



r^. Plates terminating downwards in an angle. 

 y-a- Plates resting on a truncated angle. 



2. Caryocystites granatum. Plates detached. — The whole of the 



pelvic plates and the lateral plates on one side exhibiting the 

 position of the mouth and ovarian orifice. 



p. Pelvic plates. 



Pi. Pentagonal plates. 

 p.2' Quadrangular plates. 



q. Lateral plates, first row. 

 r. Ditto, second row. 

 s. Ditto, third row. 



Si. Pentagonal. 

 *2. Hexagonal. 



t. Ditto, foiui;h row. 



3. Sycocystites Senckenbergii. The development of the separate 



plates. , 



