Ilyocryptus spinifer. 



Fig. 



1. Lateral view. 



2. Head, from below. 



3. Post abdomen. 



4. Embryo. 



5. Ilyocryptus longiremis. 



6. " sordidus. Post-abdomen. 



7. '• acutifrons. Post-abdomen. 



8. " agilis. Post-abdomen. 



9. " agilis. Head. 



10. " sordiJus. Antennule. 



11. " sordidus. Spines on free margin of shell. 



