196 ' ENDEAVOUR " SCIENTIFIC RESULTS. 



The elytral " pads " on the dorsum are double in seg- 

 ments, 2-13. 



Loc. Twenty miles east of Babel Island, Bass Strait, 65 

 fathoms. 



PHYSALIDONOTUS PAUCiBRANCHiATUS 1 , sp. nov. 

 (Plate xxxix., figs. 36-38 ; Plate xl., figs. 39-42.) 



A single individual measuring 23 mm. in length by 9 mm. 

 over the elytra, and 11 mm. over the chaetae. 



The shape is similar to that of the other species, a broad 

 oval. The elytra are pale, almost white, with a pinkish tint, 

 or even a faint purplish tint in some of the anterior elytra. 



In the pre-areolar region the tubercles are small and 

 dark, many nearly black, stellate, and very sparsely dis- 

 tributed, as, indeed, they are all over the elytron. 



There are no special areolar papillae, but just behind this 

 region is a row of 5-6 much larger multiradiate papillae, most 

 of which are dark greenish, nearly black to the naked eye, 

 which show up conspicuously on the pale background. 



These large papilla? are close together in a line running 

 along the length of the elytron, reaching nearly from the 

 mesial and to the external border. 



The posterior region is almost free from tubercles, as they 

 are few and scattered, stellate in form, much smaller than 

 those in the post-areolar row ; but close to the posterior 

 margin is a single row of large papillae about half the size 

 of the post-areolar row, the number and distribution of which 

 naturally varies. In some of the elytra this posterior series 

 extends nearly to the mesial border, but usually ceases at 

 the upper end of the level of the areola. 



The mesial surface above the areola is sparsely covered 

 with small dark spiny tubercles. 



Further, the lateral region, especially towards the anterior 

 border, has very few tubercles, but is sparsely covered by 

 long filamentous processes similar to those constituting the 

 marginal fringe, but of greater length (PI. xl., fig. 42) ; a few 

 of shorter length are found also in the external portion of 

 the posterior region. 



The papillae are much shorter than in the previous species, 

 even the largest are short, low cylindrical columns of con- 

 siderable width, terminating in a nearly flat top, wider than 

 the base, the margin of which is produced into a variable 

 number of short rays. In those of slightly less size, these 



1. In reference to the fewness of the branchial papulae. 



