A REVIEW OF THE MYSIDACEA 



135 



Remarks. — The specimen from Albatross station 2861 is attributed 

 to P. truncatvm with some hesitation. It is not in good condition 

 and differs from typical specimens of the species in having three 

 spines on each side of the apex of the telson, the outermost spine 

 only half as long as the two inner pairs. This outer spine may be 

 regarded as belonging to the lateral margins of the telson, but it is 

 longer than the remainder and distinctly apical in position. Figure 

 47, a-c, shows the salient characters of this species. 



PSEUDOMMA BERKELEYI Tattersall 



Figure 48 

 This species is described on page 243. 



Figure 48. — Pseudomma berkeleyi Tattersall: a, Ocular plate, X 37%; b, antennal scale,. 



X 37#; c, telson, X 37#. 



PSEUDOMMA sp. ? 



Reference is made to this species on page 244. 



PSEUDOMMA OCULOSPINUM, new species 

 Figure 49 



Description. — A species of Pseitdomma characterized by the fol- 

 lowing special features: 



(1) The ocular plate (fig. 49, a) has the median furrow separat- 

 ing the two halves about half as deep as the median length of the 

 plate; the outer distal corner of the plate drawn out into a long 

 sharp spinous process; inner distal corner of each plate somewhat 

 produced and bluntly rounded; margins of the ocular plate smooth, 

 without teeth or denticles. 



(2) The antennal scale (fig. 49, b) extends beyond the distal end 

 of the antennular peduncle by one-third of its length; four times 



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