INTRODUCTION. 
XV 
Family e. Lichad^— Continued. 
Sub-genus 4. Arges. 
“ 5. Ceratolichas. 
“ 6. Dkranogmus. 
Family f. Proetid^. 
Genus 13. Pro'etus. 
“ 14. Phaethonides. 
“ 15. Cyphaspis. 
Sub-Class B. Merostomata. 
ORDER IV.—XIPHOSURA. 
Family a. Limulid^. 
Genus 16. Protolimulus. 
ORDER V—EURYPTERIDA. 
Family a. Eurypterid^. 
Genus 17. Eurypterus. 
“ 18. Stylonurus. 
Sub-Class C. Malacostraca. 
ORDER VI.—PHYLLOCARIDA. 
Family a. CERATiocARiOiE. 
Genus 19. Ceratiocaris. 
“ 20. Echinocaris. 
“ 21. Elymocaris. 
“ 22. Tropidocaris. 
Family b. Pinacarid^. 
Genus 23. Mesoihyra. 
Family c. Rhinocarid^. . 
Genus 24. Rhinocaris. 
Family d. Discinocarid^. 
Genus 25. Spathiocaris. 
“ 26. Dipterocaris. 
ORDER VIL—DECAPODA. 
Family a. Caridid^. 
Genus 27. Palmpalczmon. 
