INTRODUCTION. xv 



Family e. Lic-hads — Continued. 



Sub-Class B. Merostomata. 



ORDER IV.—XIPHOSURA. 



Family a. LimulidjE. 



Genus 16. Protolimulus. 



ORDER V—EURYPTERIDA. 



Family a. Eurypterii* i . 



Genus 17. Eurypterus. 

 " 18. Stylonurus. 



Sub-Class C. Malacostraca. 



ORDER VI.—PHYLLOCARIDA. 



Family a. Ceratiocarid.e. 



Genus 19. Ceratiocaris. 

 " 20. Echinocaris. 

 " 21. Elymocaris. 

 " 22. Tropidocaris. 



Family b. Pinacarid^e. 



Genus 23. Mesothyra. 



Family c. Rhinocarid^e. 



Genus 24. Rhinocaris. 

 Family d. Discinocaride. 



Genus 25. Spathiocaris. 

 " 26. Dipterocaris. 



ORDER VII.— DEC APOD A. 



Family a. Caridid.e. 



Genus 27. Palaopalamon. 



