EXPLANATION OF PLATE XLViL 

 CRINOIDEA. 



Oligometra thetidis. 

 Fig. L — First pinnule, x 5. 

 Fig. 2. — A pinnule from middle of arm. x 5. 

 Fig. 3. — A cirrus, x 5. 



Himerometra jjcedophora. 

 Fig. 4. — First pinnule, x 10. 

 Fig. 5. — Second pinnule, x 10. 

 Fig. 6. — A distal pinnule, x 10. 

 Fig. 7. — Youngest pentacrinoid larva, x 35. 

 Fig. 8. — Pentacrinoid larva, x 35. 

 Fig. 9. — Old pentacrinoid larva, x 35. 

 Fiof. 10. — A cirrus, x 10. 



