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120 



STALK-EYED CRUSTACEA. 



Length (female adult), 96 mm. ; length of carapace, 41 mm. ; breadth of 

 carapace, 31 mm.; length of cheliped, 87 mm. (ischium, 16 mm., merus, 23 

 mm., carpus, 9 mm., basal part ot: propodite, 15 mm., dactylus, 18 mm.). 



Station 3354. 322 fathoms. 1 male. 



1'^ 



I, 



a 



a 



u 



3402. 421 



3403. 384 



3409. 



327 



U 



Ci 



u 



2 males, 1 fern. 

 12 males, 14 fern. 

 1 fem. 



■!! 



This species nearly resembles P. nanm (Smith), but may be easily distin- 

 o-uished by the difference in number of spines on the median and sublateral 

 carina) of the carapace, by the presence of a spine on the antcro-external 

 an^'-le of the first and second abdominal pIeuro3, and by the greater number 

 of spines on the merus, carpus, and propodite of the chelipeds. P. nanu8 is 

 also described as having the posterior pair of thoracic legs chelate in the 



rn 



ale. 



Compared with the types of P. agassizli (A. M. Edw.), the carapace of the 

 present' species is seen to be broader and fewer-spined on the margins; the 

 first and second abdominal pleuroa are armed with an anterior lateral spine ; 

 the rostral spine is double instead of being single ; the orbital sinus is broad 

 and round at the bottom instead of being narrow and acute, etc. P. agas- 

 sizii, like P. ianneri, has non-chelate posterior legs in the male. 



The branchial formula is as follows : 



Somites 



Fleurobranchise 



Arthrobranchiee 



Podobranchiae 



Epipods 



VIII. IX. 





 

 

 





 

 



r 



X. 





 2 

 1 

 1 



XI. 



1 



2 

 1 

 1 



XII. XIII. XIV. 



1 



2 

 1 

 1 



1 

 2 

 1 

 1 



1 

 

 

 



4 



8 

 4 



^ 



(4 + 1 r) 



16+(4. + lr) 



The epipods of the second, third, and fourth pairs of chelate appendages 

 are very delicate in texture and about half as long as the podobranchia^ 

 borne by the same appendages. The epipod of the first pair of chelate 

 appendages is smaller than those back of it, while the one on the third 

 maxilliped is reduced to a mere rudiment. 



I 



V 



'I 



J 



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