518 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



16. Hindmargin of article 6 on gnathopod 2 quite short, palm with two bumps. 



H. pusilla 

 Hindmargin of article 6 on gnathopod 2 almost as long as palm, palm lack- 

 ing distinct bumps 17 



17. Palm of gnathopod 1 40% as long as hindmargin of article 6 . H. pygmaea 

 Palm of gnathopod 1 more than 70% as long as hindmargin of article 6 . 18 



18. Palm of gnathopod 2 not defined by spines H, media 



Palm of gnathopod 2 defined by 2 spines H. saldanha (in part) 



19. Palm of gnathopod 2 with one or more bumps 20 



Palm of gnathopod 2 lacking bumps H. honoluluensis 



20. Palmar bump of gnathopod 2 one-third of the palmar distance from finger 



hinge H. niacrodactyla 



Palmar bump of gnathopod 2 at finger hinge H. chevreuxi 



21. Gnathopod 2 with cuplike hollow lined with setae on medial surface of palm. 



H. grenfelli 

 Gnathopod 2 lacking cuplike hollow 22 



22. Finger of gnathopod 2 apically inflated H. diastotna 



Finger of gnathopod 2 tapering distally 23 



23. Hindmargin of article 6 on gnathopod 2 extremely short or heavily setose. 



H. hirtipalma 

 Hindmargin of article 6 on gnathopod 2 not short or not heavily setose . . 24 



24. Article 6 of pereopods 4-5 with spines or setae on hindmargin 25 



Article 6 of pereopods 4-5 smooth behind 26 



25. Coxa 2 rounded behind H. prevosti 



Coxa 2 with hindlobe (see notes) H. iwasai 



26. Antenna 2 "short" (use both halves of couplet) 27 



Antenna 2 "long" 30 



27. Finger of pereopods 1-5 pectinate H. grandicornis 



Finger of pereopods 1-5 not pectinate 28 



28. Antenna 2 very slender, gnathopod 2 with palmar process near finger hinge. 



H. grimaldi 

 Antenna 2 stout, gnathopod 2 lacking palmar processes 29 



29. Antenna 2 lacking dense setal tufts . . . H. crassicornis and H. bishopae 

 Antenna 2 with dense setal tufts H. plumulosa 



30. Distal finger setule large on pereopods 1-5 H. perieri 



Distal finger setules weak or absent on pereopods 1-5 31 



31. Finger of maxilliped with long apical seta or setae. 



H. camptonyx and H. rubra 

 Finger of maxilliped with short or no apical setae 32 



32. Palm of gnathopod 2 defined by 2 large spines . . . H. saldanha (in part) 

 Palm of gnathopod 2 defined by 1 small or no spine 33 



33. Hand of gnathopod 1 expanding distally, broad 34 



Hand of gnathopod 1 rectangular, not expanding distally . . . . H. nigra 



34. Palm of gnathopod 1 defined by spine and large bump . . . . H. dollfusi 

 Palm of gnathopod 1 not defined by spine and bump . . . . H. schmidti 



Notes. — Bulycheva (1957) refers Hyale carinata to H. pontica but 

 the female gnatliopods of H. carinata as figured by Clievreux and 

 Fage (1925) differ from tiiose figured for H. 2)ontica both by Sars 

 (1895) and Chevreux and Fage (1925). 



