BY "WILLIAM A. IIASWELL, M.A., B.SC. 247 



equal in length to the cephalon and pereion ; peduncle with three 

 articuli visible, the third nearly twice as long as the second ; 

 flagellum longer than peduncle, finely fringed with cilia. Mandibles 

 powerful, very deep ; furnished with a large and prominent molar 

 eminence crossed by about a dozen dentary ridges ; cutting edge 

 armed with four teeth, that nearest the molar surface bifurcated, 

 the next two simple, prominent, the fourth inconspicuous ; between 

 the first of these teeth and the molar eminence are several pointed 

 curved ciliated spines. Maxillipedes resembling somewhat those 

 of T. locusta ; the plate of the first articulation armed with three 

 short blunt teeth, that of the second articulation ending in a single 

 tooth ; carpus and propoclos with one or two setce. Anterior 

 gnathopoda pediform, the propodos tapering distally. Posterior 

 gnathopoda imperfectly subcheliform ; the carpus and propodos 

 long and narrow (longer in the female than in the male) the short 

 dactylos situated at a little distance from the extremity of the 

 propodos.- 1 ' Anterior pereiopoda subequal. Pereiopoda of the 

 third pair much shorter than the fourth and fifth ; bases of fifth 

 pair broad, finely serrated along the posterior margin. Last pair 

 of pleopoda short. Telson consisting of a disc-like, dorsally- 

 concave plate, bordered with hairs, and cleft in the middle line 

 posteriorly. 



Colour usually dark slate ; occasionally dull yellow. 



Length five and a half lines. 



The habitat of this species of Talitrus is peculiar. It is 

 abundant on moist ground in wood and scrubs of New South 

 Wales ; I have received specimens, obtained by Mr. Greorge 

 Masters, from Eootyhill (a point about 30 miles from the coast) 

 where it is very common ; how much further inland its range may 

 extend I have no exact data to enable me to determine ; probably 



*These appendages instead of being- habitually folded up under the pereion, 

 as in T. locusta and other species of the genus, are in constant and active 

 use as organs ancillary to the process of mastication, 



