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176 



STALK-EYED CRUSTACEA. 



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The eggs, from 

 1.5 mm. 



a female 74 mm. long. Station 3403, measure 2 mm. by 



Bate's description and figure of P. acidz/rons are so imperfect that I am 

 not sure that the " Albatross " specimens belong to the same species. The 

 latter differ from Bate's figure in the following ways : the tooth at the 

 anterior end of the dorsal carina of the carapace is not, at least in most 

 examples, inclined upward so much ; the merus of the first pair of legs is 

 armed with three or four spines on the distal half of the inferior margin, 

 while in Bate's figure of P. acidifrons this joint is furnished with six spines, 

 which are regularly arranged along the whole length of the inferior margin ; 

 moreover, the notch in the end of the telson is shallower, and the stylocerite 

 of the antennule falls considerably short of the distal extremity of the first 

 segment. The second segment of the second pair of legs in the ^^ Albatross" 

 specimens is produced to an acute tooth at the distal end of the inferior mar- 

 gin, but this margin is not spinulose. The inferior margin of the fourth seg- 

 ment (merus) of the same pair is armed with from eleven to fifteen spines. 



Compared with P. tarda Kriiyer, the carapace in our specimens increases 

 much more in height posteriorly, the dorsal crest of the carapaceis smaller 

 and does not project so far forward, the notch in the distal extremity of the 

 telson is much shallowerj and the second segment of the second pair of legs 

 is devoid of spines on the inferior margin. In P. norvegica Sars {=P, tarda^ 

 juv. ?) the dorsal crest of the carapace is more advanced, the antennal scale 

 narrower, the notch in the telson deeper, and the whole inferior margin of the 

 merus of the first pair of legs is spined, as in Bate's figure of P. acidifrons ; 

 furthermore, the second segment of the second pair of legs is armed with a 

 series of spines, which is not the case in P. acidifrons. In P. princeps Smith, 

 ozily the anterior third of the carapace is carinated above, and the merus of 

 the first pair ,of legs is devoid of spines. 



The original specimens of P. acidifrons Bate were collected off Port 

 Churruca, Patagonia, 245 fathoms, and south of Japan, 775 fathoms. 



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Pasiphaeia magna Eax. 



Plate XLV., Fig, 2-2'. 



Bull Mas. Comp. Zool. XXIV- 200, 1893. 



The carapace, measured along the dorsal line from the tip of the rostrum 

 to the posterior margin, is a little less than two fifths of the length of the 



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