118 Part III. — Twenty-first Annual Report 



had probably on previous examinations been passed over as being merely a 

 form of it. Recently, however, a more careful scrutiny of these smaller 

 forms has revealed certain structural differences which render their removal 

 from that species necessary, and as this form is distinctly smaller than the 

 other, I propose to call the new species Tetragoniceps pygmoeus, and the 

 following is a description of it : — 



Description of the Female. — The female closely resembles the female of 

 Tetragoniceps incertus but is distinctly smaller, measuring only a little 

 over -5 mm. (about -jj of an inch). (Tetragoniceps incertus is about one 

 millimetre in length). The body is very slender, with a small but 

 distinct rostrum (fig. 11). 



Antennules almost similar to those of Tetragoniceps incertus, differing 

 only to a small degree in the proportional lengths of the different joints 

 (fig. 12). The antennae and mouth organs are also very similar. 



The first four pairs of thoracic feet are also very similar to the same 

 appendages in Tetragoniceps incertus, but the first pair are rather more 

 slender, especially the inner branches, while the seta on the inner margin 

 of the first joint appears to be situated nearer the middle of it, the outer 

 branches appear also to be proportionally rather longer (fig. 14). 



The fifth pair (fig. 16) are not only smaller, but differ in form and 

 armature ; they are more bluntly rounded at the apex, and instead of 

 terminating in a single stout apical spine as in the species referred to, there 

 is at the base of the larger spine another one, small but distinct ; the 

 arrangement of the supplementary setse is also different in the two species, 

 as shown by the drawings. 



The f ureal joints, which are somewhat dilated in the middle, taper 

 towards the distal end ; the principal apical seta of each f ureal joint is 

 moderately short, and the outer portion of it terminates somewhat 

 abruptly, but is continued by a slender portion which forms a peculiar 

 loop where the two portions join, as indicated by the figure ; this 

 peculiarity is not found in Tetragoniceps incertus (fig. 19). 



The male resembles the female, except in the following particulars. The 

 antennules (fig. 1 3) are modified for grasping, they differ slightly from 

 the male antennules in Tetragoniceps incertus. 



The inner branches of the third pair of thoracic feet (fig. 15) are small 

 and three-jointed ; the first and second joints are very short, but the inner 

 part of the second is produced into a long bent spiniform process which 

 extends considerably beyond the extremity of the branch ; the last joint 

 is also small and bears a minute terminal spine. In Tetragoniceps incertus 

 this branch has a long straight process arising from its inner basal aspect 

 and is furnished with two terminal setse. 



The fifth pair are smaller than those of the female, they also differ in 

 their armature as shown by the drawing (fig. 17). The supplementary 

 foot oil the first abdominal segment is furnished with three setse (fig. 18). 



Remarks. — This form, though perhaps it does come somewhat near to 

 Tetragoniceps incertus, is not difficult to distinguish from that species, 

 even without dissection, by its smaller size and by the difference in the 

 character of the fifth feet and the f ureal joints, and these differences are 

 of course more easilv observed when one has both forms under observation. 



Genus Laophonte, Philippi (1840). 



LaopTionte gracilis, T. Scott, sp. nov. PI. vi., figs. 6-12. 



Description of the Female. — The body is slender and sub-cylindrical, 

 and appears to be covered with exceedingly minute hairs. It has a small 

 blunt rostrum, and the furcal joints are scarcely so long as the last 



