A (11) Tip of rostrum obviously exceeding antennular peduncle H. zostericola 



Figure 19. — Hippclyte zostericola; carapace 

 and antennule, lateral view. 



11 (10) Rostrum nearly twice length of carapace proper, smooth above, toothed on ventral 



margin Tozeuma carolinense 



Figure 20. — Tozeuma carolinense; carapace, lateral view. 



12 (9) Supraorbital spines present 13 



12 (9) Supraorbital spines absent Eualus A 



A (12) Tip of rostrum usually not reaching 

 distal edge of eye (rarely exceeding 

 eye) E. pusiolus 



Figure 21. — Eualus pusiolus; carapace and eye. lateral view. 



A (12) Tip of rostrum greatly exceeding distal edge of eye B 



B (A) Rostrum slender, toothed dorsally 



throughout length E. gaimardii 



Figure 22. — Eualus gaimardii; carapace, lateral view. 



B (A ) Rostrum lacking dorsal teeth on dis- 

 tal part beyond eye E. fabricii 



Figure 23. — Eualus fabricii; carapace, lateral view. 



