8 (6) Chelae of first pair of legs distinct Family Hippolytidae 9 



8 (6) Chelae of first pair of legs microscopic or absent Family Pandalidae 14 



9 (8) Carpus of second leg divided into 3 articles 10 



9 (8) Carpus of second leg divided into 7 articles (proximal to distal, 2 short, 1 long, 4 short) 12 



Figure 15. — Second leg with subdivided carpus, 

 3 articles. 



Figure 16. — Second leg with subdivided carpus, 

 7 articles. 



10 (9) Without series of small spines on anterior margin of carapace below eye 11 



10 (9) A series of small spines (5 to 9) along anterior margin of carapace below eye 



Lotreutes fucorum 



Figure 17. — Latreutes fucorum; carapace and 

 head appendages, lateral view. 



1 1 (10) Rostrum considerably less than twice length of carapace proper and with both 



dorsal and ventral teeth Hippolyte A 



A (11) Tip of rostrum not exceeding antennular peduncle H . pleuracanthus 



Figure 18. — Hippolyte pleuracanthus; carapace 

 and head appendages, lateral view. 



