CRUSTACEA OF NORTHUMBERLAND AND DURHAM 



fathoms, and in several dredgings off Souter Point in 21-39 

 fathoms (G. S. B.) N.D. 



DiASTYLis Bradii Norman, Plates viii., ix. 



1879. Diasiylis Bradii, Norman, Crustacea Cumacea of 

 the "Lightning," "Porcupine," and "Valorous" Expedi- 

 tions, Ann. and Mag. Nat. Hist., ser. 5, vol. iii., p. 57. 



1888. Diastylis Bradii, A. O. Walker, Proc. Biol. Soc. 

 Liverpool, vol. ii., p. 178, pi. xii., figs. lo, 11. 



Female. — Body moderately robust ; carapace with dorsal 

 margin little arched, the depth not very unequal tliroughout, 

 about equal in length to the free segments of the trunk ; 

 anterior portion of body subequal in length to the tail exclusive 

 of the telson. Carapace with the lateral margin minutely 

 serrated throughout almost its entire length ; surface beset 

 with spines of very small and subequal size; these minute 

 spines are in certain places arranged in regular lines, and thus 

 become more conspicuous and map out the carapace into 

 areas. These lines of spines are chiefly as follows : an arched 

 row situated about the middle of the length of the carapace 

 passes from the lateral margin with a curve to the dorsal line 

 in front of this another row passing upwards from the lateral 

 margin bifurcates, the hinder branch passing round the back 

 of the stomachic region ; the other branch is directed forward 

 to the rostrum, just before the extremity of which it dies out. 

 There are also two transverse rows which cross the back of 

 the stomachic region. 



The anterior free segments of the trunk have their front 

 dorsal margin minutely crenulated ; the last segment is rather 

 widely separated from the preceding, and has its anterior 

 margin cut into teeth which alternate with conspicuous 

 plumose setcie ; the epimera of this segment are in both sexes 

 produced backwards into large acute processes. 



The tail has a series of small spines on the lower lateral 

 margin of the segments. The antennae reach beyond the 

 rostrum by the length of the last very long joint of the 

 peduncle; flagellum as long as the last joint of the peduncle; 



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