NOTES ON TASMANIAN CRUSTACEA, ETC. 



the claw, or fourth joint, is really two-jointed near its sharp apex. 



The first and seco7id pairs of g^iatJiopoda [PL v., fig. 2) are 

 sub-equal in size and form, and though distinctly sub-chelate 

 are not very large ; they have the basos long ; the ischium and 

 meros very short — the latter produced at its extremity into an 

 acute point ; the carpus broadening distally, with several tufts 

 of setae along its lower margin; the propodos sub-quadrate, 

 •with the palm obliquely transverse, and defined by a stout 

 spine ; dactylos, long, and slightly curved. Both pairs of 

 limbs have the joints much compressed, and the propoda 

 fringed with tufts of setae, especially along their lower margins. 



The pereio]Joda increase in length posteriorly, are rather 

 slender, with narrow basa, and have very short spinous setae, 

 which are only sparingly produced at the extremities of the 

 joints. 



The uropoda (PL v., fig 3) of the first and second pair, are 

 sub-equal in length, and shorter than the outer branch of the 

 third pair, which is very long, while the inner branch is so 

 short as to be only seen with difiiculty. 



The telson (PI. v., fig. 4) is cleft into two irregularly tri- 

 angular portions, each tipped with a few^ spines ; the number 

 of the latter varying in different specimens. 



21. Niphargus montanvs, n. sp. (PI. vi., figs. 1-13.) 



My first specimens of this interesting form were handed 

 ine by Mr. L. Rodway, who obtained them on the top of Mt. 

 "Wellington (4000t't). He had collected a bunch of sedges from 

 some swampy ground near the summit, and on washing out 

 the roots in a basin of water, observed a number of small 

 amphipods swimming about ; these he secured and handed to 

 me. During this last winter, Mr. Morton made the ascent of 

 the mountain, and obtained a considerable number of speci- 

 mens from the pools, which were frozen over at the time. 



The chief point in which this species differs from the generic 

 character, is in the length of the last pair of uropods. These 

 are hardly longer than those of the preceding pair ; but, with 

 this exception, it coincides very well with Spence Bate's 

 definition. The following are the specific characters : — 



Coxae of four anterior segments produced considerably 

 downwards, the posterior pairs only about half as deep ; eyes, 

 relatively large, subreuiform, close to the rounded front margin 

 of the cephalon ; antennae, short, superior pair not longer than 

 the cephalon, and two anterior thoracic segments; lower pair 

 with the joints of the peduncle sub-equal, and flagellum short ; 

 Maxillipeds, stout, with 4-jointed palp ; both pairs of the 

 gnathopoda sub-equal, with broad carpi and nearly square 

 propoda ; pereiopoda and uropoda furnished with short, very 

 stout marginal spines ; terminal uropoda, hardly longer than 



