NO. 3 BARNARD: THE PHOXOCEPHALIDAE 345 



This key is quite artificial, being based largely on Table 14 which 

 lists the condition of seven major features of importance in distinguish- 

 ing harpiniids. 



The artificiality is imposed by the lack of knowledge for most of 

 the species of the epistome, the structure of the lower corner of the 

 head and the first two uropods, all of which may have more phylo- 

 genetic value than the characters which are used. 



The lower head process is considered herein to be absent where not 

 described but all of the species should be rechecked. The presence or 

 absence of an oblique setal row on the third pleonal epimera is also un- 

 known in many species. 



Key To Female Harpiniids 

 1. Third pleonal epimeron lacks lower posterior tooth 2 



1. Third pleonal epimeron bears lower posterior tooth 11 



2. Peraeopod 5, article 2, anterior lower elge 



with an expanded setal row 3 



2. Peraeopod 5, article 2, anterior lower edge with 2-5 setae 4 



3. Head bears a process at lower corner brevirostris 



3. Head lacks a process at lower corner abyssi 



4. Peraeopod 5, article 2, posterior edge with 10 small teeth. .moiseevi 



4. Peraeopod 5, article 2, posterior edge with 5 or less teeth 5 



5. Epistome produced strongly epistomatus n. sp. 



5. Epistome not produced 6 



6. Third pleonal epimeron bears a notch at lower posterior corner.. 7 



6. Third pleonal epimeron lacks a notch at lower posterior corner.. 8 



7. Peraeopod 4 long, third pleonal epimeron lacks oblique 



setal row crenulata 



7. Peraeopod 4 short, third pleonal epimeron bears oblique 



setal row crenuloides 



8. Third pleonal epimeron bears oblique setal row truncata 



8. Third pleonal epimeron lacks oblique setal row 9 



9. Third pleonal epimeron prolonged posteriorly naiadis n. sp. 



9. Third pleonal epimeron not prolonged posteriorly 10 



10. Peraeopod 5, combined length of articles 3-7 shorter than 



anterior edge of article 2 curtipes 



10. Peraeopod 5, combined length of articles 3-7 longer than 



anterior edge of article 2 laevis and sp. D 



