402 



Surface of peraeon with numerous acute tubercles, forming a 

 fairly well-marked row along the posterior margin with 

 another row less distinct situated more anteriorly on each 

 segment, a few tubercles irregularly scattered between the two 

 rows ; epimera not greatly expanded, all united with the seg- 

 ment without sign of suture, each with a distinct oblique 

 ridge marked with small pointed tubercles, running outwards 

 and backwards to the posterior angle. Segments 3, 4, and 

 5 of pleon with well-developed epimera which have the pos- 

 terior angles acute, terminal segment triangular, its extremity 

 rounded. 



Antennae about half the length of the body, slender, 

 fifth joint slightly longer than the third and fourth together ; 

 flagellum as long as the fourth, with the first joint longer than 

 the second, which is slightly longer than the third, fourth 

 slender, about half as long as the preceding, and merging 

 almost imperceptibly into a pencil of very short setae, whole 

 surface of antenna covered with minute short spinules and fine 

 short setae. 



Legs subequal in length, the posterior ones only slightly 

 increasing in length ; all rather spiny, the largest spine, which 

 splits towards the end, being situated near the distal end of 

 the carpus. 



Uropoda with base broad, reaching distinctly beyond the 

 end of the terminal segment ; outer ramus nearly twice as long 

 as the base, broad, lanceolate, slightly flattened ; whole sur- 

 face covered with minute spinules : inner ramus arising more 

 anteriorly, slender, only slightly tapering, ending with pencil 

 of long setae and reaching only slightly bevond the base 

 (fig. 20). 



Length, 11 mm. ; breadth, 5 mm. 



9 • Differing from the male in having the body less dis- 

 tinctly tuberculated ; epimera 2, o, and 4 separated from 

 their segments by a fine suture, and the uropoda much less 

 elongated, the outer ramus being only as long as the base 

 and the inner ramus reaching about half-way along the outer 

 (fig. 21). 



Dimensions of the ovigerous female examined. Length, 

 10 mm.: breadth, 4 mm. 



Colour. — Yellowish, with markings of dark brown. 



Habitat. — Coogee Bay, near Port Jackson, New South 

 Wales (C. Chilton) ; Kangaroo Island, South Australia (W. 

 II . Baker). 



The pleopoda of the male agree generally in shape with 

 those of D. acinosa. In the first pleopod (fig. 16) the inner 

 branch forms a stout appendage about twice as long as the 

 male organ and having the inner portion hollowed on the 



