PLATE LVIIL 



Tetragonidon ctenorhynchus, female. 



Figure 



1. Shell, seen from left side, x 30. 



2. ,, „ ,, above, x 30. 



3. Antennule. 



4. Antenna. 



5. Mandibular foot. 



6. Outer tooth of second maxilla. 



7. Apex of vermiform limb. 



8. Caudal lamina. 



Rutiderma eompressa, female. 



9. Shell, seen from left side, x 40. 



10. ,, „ ,, above, x 40. 



11. ,, „ ,, front, X 40. 



12. Antennule. 



13. Antenna. 



14. Mandibular foot, {a) One of the spines of the second joint more highly magnified. 



15. Teeth and setoe of second maxilla. 



16. Caudal lamina. 



[764] 



