PLATE I. 



Figure 1. — Leptochiton benthus, n. sp. 

 „ 2. — Leptochiton belhiapi, Dall. 

 „ 3. — Leptochiton herguelensis, n. sp. 

 ,, 4. — Hcmiarthrum setulosum, Carp. 

 ,, 5. — Lepidopleurus dorsuosus, n. sp. 

 ,, 6. — Lepidopleurus dallii, n. sp. 

 „ 7. — Cliiton murrayi, n. sp. 

 ,, 8. — Plaxiphora carpenteri, n. sp. 



,, 9. — Cryptoplax striatus, Lam. (Drawn by the Author.) 



„ 10. — Cryptoplax oculatus, Quoy and Gaim. 



