395 



As Grube's paper is not readily accessible in Australia, 

 and Beddard, in consequence of Grube's full description, did 

 not describe the appendages very fully, I have added one or 

 two additional notes and figures descriptive of the species. It 

 is readily distinguished from the other Australian species by 

 the series of pointed tubercles along the posterior margins 

 of the anterior segments of the peraeon, by the median 

 tubercles on all the segments, and by the uropods having the 

 outer branch considerably shorter than the inner, with the 

 posterior end concave (see fig. 1). 



The rostrum is long, reaching to the end of the first 

 peduncular joint of the first antenna. 



The tubercles along the posterior margin of the peraeon 

 segments vary in the different segments and to some extent 

 in different specimens. They are most numerous in the fourth 

 (i.e., the third free segment), where they are, in the speci- 

 men drawn, nine on each side : on the first segment there 

 are only four on each side, on the second six, and on the 

 third seven. On the fifth and sixth segments again they are 

 reduced to one or two indistinct tubercles on a slight ridge. 



The first antenna (fig. 2) has the basal joint broadly 

 dilated, the second considerably longer than the first and 

 slightly ridged on the upper-surface, the third joint con- 

 siderably longer than the first and second together and with 

 a slight ridge on its upper-surface, the fourth joint is small, 

 the flagellum contains about 25 joints and is slightly longer 

 than the peduncle. The second antenna (fig. 3) is well char- 

 acterized by the pointed projection of the third joint on its 

 posterior aspect and by the ridge on the upper-surface, the 

 fourth joint is rather longer than the fifth, it is slightly 

 widened at the base, narrowing towards the distal end, the 

 outer surface bears five slight projections bearing small tufts 

 of hairs, the upper-surface is distinctly ridged along the 

 whole length ; the fifth joint is more slender but otherwise 

 similar ; the flagellum contains about 20 joints, and is rather 

 longer that the fifth joint of the peduncle. The mandible 

 (fig. 4) is of normal shape characteristic of the genus, the 

 basal portion having its distal end bent inwards and ending 

 in four stout teeth ; the palp is much longer than the mandible 

 itself, its second joint is the longest and bears on the outer 

 margin towards the distal end a distinct row of setae, the 

 third joint is a little more than one-third the length of the 

 second. The first maxilla (fig. 5) has the outer lobe con- 

 siderably curved and ending in about a dozen stout spinules. 

 The inner lobe is very small and narrows to the subacute 

 apex, which bears a single short spinule. The second maxilla 

 (fig. 6) has the two outer lobes narrow with the margins 



