253 



i8. Alerus-ischium of ext. maxillipeds broad, length about lY^times its 



breadth. Dactyli of walking legs rather long. Eyes unpigmented P . bïtrgeri 

 Meriis-ischium of ext. maxillipeds slender, more than twice as 

 long as broad. Dactyli of walking legs very short, under 

 margin 'of meropodites hairy. Eyes pigmented P . gracilis 



19. Dactyli of 3^^ pair of walking legs longer than those of 2*^ and 



4'^^ pair, which are subequal 20 



Dactyli of 3*^ pair of walking legs not longer than those of 

 2^ and 4"^ pair 21 



20. i^' pair of walking legs the longest, the succeeding pairs de- 



creasing gradually in length P. perezi 



3"^ pair of walking legs the longest P. piirpiii'eiis 



21. Dactyli of 4''^ pair of walking legs longer than the preceding, 



which are subequal 22 



Dactyli of 3^^ and 4"^ pair of walking legs longer than those 



of i^' and 2^^ pair, which are subequal 30 



22. Dactylus of ext. maxilHpeds overreaching propodus . . . . 23 

 Dactylus of ext. maxillipeds not reaching farther than propodus. 24 



23. Carapace quadrangular. Propodites of walking legs elongate, 



dactyli very short, but those of 4"' pair twice as long as 



those of preceding pair P . coarctafns 



Carapace narrowed anteriorly, with lateral margins much di- 

 vergent backward. Propodites of walking- legs shorter, some- 

 what hairy, dactyli strongly hooked, hairy, those of 4''^ pair 

 much more slender and slightly longer than those of 3*^ pair P. oiiychodactylus 



24. Dactylus of ext. maxillipeds reaching as far as propodus . . 25 

 Dactylus of ext. maxillipeds not reaching to end of propodus. 26 



25. Chelipeds and walking legs hairy at inner margin; middle pairs 



of walking legs about equal in length to breadth of carapace. P. tennipes 

 Chelipeds and walking legs much less hairy ; the latter slender, 



elongate, middle pairs about lYotimes the breadth of carapace P. borradailci 



26. Chelipeds and walking legs thickly hairy at inner margin . . P. barbatits 

 Chelipeds and walking legs glabrous 27 



27. Dactylus of ext. ma.xillipeds by far not reaching to end of propodus. 28 

 Dactylus of ext. maxillipeds nearly reaching to end of propodus. 29 



28. Dactyli of 4"' pair of walking legs twice as long as those of 



preceding pair P- arcophiliLS 



Dactyli of 4'^ pair of walking legs \^\, times as long as those 



of preceding pair P. margaritifcrae 



29. Palm of chela twice as long as fingers. Dactyli of 3^^ pair of 



walkine lees longer than those of 2'' pair P. vwdiolicolus 



105 



sinoGA-ExrEDiTiE xx:cixï'. 33 



