42 
BULLETIN OF THE LABORATORIES 
Plate IX. 
Fig. I, Ilyocryptiis spinifer. Her., female. 
Fig. 2. Post-abdomen of same. 
Fig. 3. Antenule of same. 
Fzg. 4 A. Jaw of I. sordidns. 
Fig. 4. Post-abdomen of same. 
Fig. 5. Post-abdomen of I. agilis. 
Fig. 6. Head of same, antennae being removed. 
Fig. 7. Antenule of /. sordidiis. 
Fig. 8. Spines on edge of shell of same. 
Fig. 9. Post-abdomen of I. aciiiifrons. 
Fig. 10. Monospilus dispar, female. 
