REPORT ON THE CRUSTACEA MAORI I! A. 



4:; 



A mastigobrancliia is attached to the coxa of every appendage from the posterior 

 pair of siagnopoda, where it is very broad and short, to the fourth pair of pereiopodaj 

 where it is long and narrow. It is slender and membranous for the distal half, the 

 margins of which are fringed with short stiff hooks, shortest towards the apex, and 

 gradually lengthening towards the base, where it becomes firm and rigid, and has the 

 margins fringed with hairs. 



A podobranckial plume in a rudimentary condition is attached to the base of all 

 the mastigobranchise, except that of the first gnathopoda and the 

 penultimate pereiopoda ; on those belonging to the second and 

 third pairs of pereiopoda there are a few branchial filaments 

 attached to the base of the stem, but fewer in the third than in 

 the second, and these gradually diminish in importance towards the 

 distal extremity, where they exist only in the form of papilliform 

 protuberances some distance within the extremity, which is sparsely 

 fringed with small hooks, as shown in the annexed woodcut. 



These are mostly small, and so are the arthrobranchial plumes 

 belonging to the third and fourth pairs of pereiopoda. 



The branchial filaments are attached to the margins, and form 

 the rudiment of a double row such as exists in the arthro- 

 branehise, and even these latter diminish in importance and Fig. 4— Podotamci 



x axiiis '" utifrons. 



become papilliform towards the apex. 



The following table shows the general arrangement of the branchia in this species : — 



Pleurobranckire, . . . 



Arthrobranchioe, 

 Podobranchiae, . . 



Mastigobrancliia. 



klobrancliia of Eicon- 



Eiconaxius kermadeei, n. sp. (PI. Y. fig. 3). 



Palm and propodos of the larger chela strongly denticulated, and having a hollow 

 space between them and the dactylos. 



Length, 37 mm. (1^ inch). 



Habitat.— Station 171, north of the Kermadec Islands, July 15, 1874 ; lat. 28° 33' S., 

 long. 177° 50' W.; depth, 600 fathoms ; bottom, hard ground ; bottom temperature, 39°'5. 



This species much resembles Eiconaxius acutifrons, and were they found associated, 

 would probably be mistaken for it, The rostrum is a little longer and less acutely 

 pointed, and the margins are minutely serrate. The gastric region is more distinctly 

 defined by a ridge from the frontal ; but a more noticeable distinction exists in the form 



