TEEEESTEIAL ISOPODA OF Ni:W ZEALAND. 129 



JLeiigth of largest specimen seen o"5 mm. 



Ilahilat. — Blueskiii Bay, Otago, undei' seaweed, &c. at high-water mark. 



Hcnuo-lH. — Of this species I have only a few small specimens collected at Bluoskin 

 Bay about 1887. I have never found it since, tliongli I Iiave frequently searched the 

 same locality and otlier similar situations, and I am unal)le to say whether it attains a 

 larger size or not. In order that its affinities may be made as clear as possible, I have 

 figured the moiitli-parts in some detail, and add further description of some of its 

 appendages. 



The upper li[) is of tlie usual structure. 



The loj't mandible has the outer cutting-edge formed of three well-marked teeth 

 strongly chitinized, the inner cutting-edge similar and of four teeth ; near its base 

 arises a hairy niemljranaceous lappet with the innermost seta longer than the others • 

 next, at a considerable distance, follows a single long-curved, feathered seta ; and ne\t 

 from a slight prominence, a brush-like tuft of stitf simple setie, the; outer ones the 

 shortest, the others gradually increasing in lengtii, the innermost ones bein^ very Ion"-. 



The right mandible is similar, but the outer cutting-edge appears to Ijear four tc(;!li 

 and the inner cutting-edge is smalle)", less ehitinous, and ends in three or four small 

 sharp teeth, apparently arranged in a circle roiuid the extremity. 



Lower lip formed of two rounded lobes with numerous sette directed inwards and 

 between them a narrow tongue-like process with its margins thickly fringed with setic. 



Theji/'fil m((xiUce has the outer lobe oblong in shape, its inner margin friuo-ed in distal 

 half with tine setiu, and towards the end bearing aljout ten dentate sette of various sizes 

 and irregularly arranged ; the extremity and a little of the outer margin bears a compact 

 row of long, simple, hair-like setie, the outer ones being the longest, the inner ones 

 stouter and a little incurved. Inner lobe of normal form, the distal plumose bristle 

 much shorter than the other. 



The second maxilla; form a delicate oblong plate, distinctly cleft at the aiiex, out(U' 

 lobe about half as large as the inner, both roumled and bearing delicate setie, the inner 

 one with a row of short stouter sette also. 



Tlie nuu-illipedes have the epipodite narrow ol)loug, as long as the basos, truncate at 

 end, end and distal half of outer margin with delicate setie ; basos narrow, its outer 

 margin not expanded ; masticatory loljo large, more than half the length of the palp ; 

 palp with the ischium distinct, but the remaining joints combined into a triangular 

 plate witli its inner margin thickly fringed with setie, and with a faint indication of 

 lobes indicating the separate joints. 



The first and seventh legs are shown in the plate, and do not require further descrip- 

 tion ; the dactylar seta is large and well marked ; its general ajjpearance will be best 

 learnt from the figure. 



The pleopoda appear to be all of about the same structure ; in the first the endopodito 

 is of nearly the same size as the exopodite, but narrower; tliere is a small "epipodite '' 

 arising from the basal jiortion. In the third and succeeding pleopoda the eudopodite 

 arises considerably more proximally than the exopodite, and is smaller in proportion. 

 I have not been abb; to examine the pleopoda in the nuile. The uropoda have already 

 been sufficiently described. 



