222 Proceedings of tlte Royal Society of Victoria. 



Hiiother on each side. The niolai- expansion is Jai-ge and its end 

 broad and concave. 



The /-/>/;/ mandible has but a single cutting edge which is 

 divided into four teeth ; between the base of this plate and the 

 molar expansion there is a secondary process which bears a single 

 row of about six slightly pectinated spines, and between this 

 process and the cutting-edge there is a single stouter simple spine. 

 The molar expansion is longer than che left-hand one, and its 

 surface is larger and convex. 



The mandibular palp has the first joint short, being as broad 

 as it is long, the second fully three times as long, and the third 

 fully half as broad as its length, which is less than the second ; 

 each bears many long setae, those at the apex of the terminal 

 joint being curved, and faintly feathered. 



Posterior Lip. — The posterior lip is very thick at the base, and 

 divided into two rather broad lobes which are irregularly rounded 

 distally and fringed with long setae. 



First Maxillae. — The outer lobe of the first maxillae has the 

 end obliquely truncated and crowded with 10 spines, some of 

 which are more or less pectinated. The inner lobe is consider- 

 ably shorter than the outer one, the end set very obliquely and 

 clothed as follows : — A single spine at the outer extremity, at the 

 base of which arises a long plumose setae of identical form to 

 those .so-called auditory, then follow a row of five stout setae, 

 which are slightly curved and a little pectinated near the ends on 

 their outer face, and ciliated along the same face lower down. 



Second Maxillae. — In the allied forms, except Phreatoicopsis, 

 there is a pretty close agreement in this organ. The present 

 form presents no peculiarities of its own. The inner lobe is 

 relatively long and extends to the level of the two outer twin 

 lobes. 



Maxillipedes.— These are comparatively rather slender. The 

 epipodite is somewhat small and narrow, and the distal margin 

 angular, with the ape.x rounded off. The basis, ichium, and 

 merus are without any special differences to other forms ; the 

 plate of the basis extends to the distal extremity of the merus, 

 and bears three curved coupling spines on the right and two on 

 the left-hand sides. Tlie carpus is rather long and slender, and 

 tlie outer di.stal angle is not produced. The propodus is of equal 



