PARACOEOPEIUM EXCAVATUM.— CHILTON 



47 



The antennal lobe being found only in the male probably has some sexual 

 function, but being flat on the inner side it perhaps also facilitates the holding 

 together of the right and left antennae as the animal swims backwards. 



The mandible (fig. 3) is of normal structure with large molar tubercle, 

 the cutting edge consisting in the left mandible (fig. 3) of 3 or 4 teeth, the 

 accessory process being similar and of approximately the same size; the spine 

 row contains about 5 spines. In the right mandible (fig. 4) the accessory process 

 is narrower. The palp is large, second joint the longest with a small tuft of 

 seise at the distal end, third joint widens distally and bears numerous long seta3 

 at the apex with a small tuft at a little distance from the apex which is obliquely 

 truncate. 



The first maxilla (fig. 5) has the inner lobe very small and delicate, 

 triangular, and bearing a minute setule at the end. The outer lobe ends in about 

 7 to 9 dentate spines; the palp has the first joint slightly swollen, the second 

 joint widens distally and bears at the apex 7 or 8 short setules. 



Fig. 3. — Left mandible, male (Roto-iti specimen). 



Fig. 4. — Cutting edge of right mandible, male (Roto-iti siiecimen). 



Fig. 5. — First maxilla, male (Roto-iti specimen). 



Fig. 6. — Second maxilla, male (Roto-iti specimen). 



The second maxilla (fig. 6) has the inner lobe shorter and broader than 

 the outer and is fringed along its inner margin as well as at the rounded apex, 

 in the outer lobe the long sets are mainly confined to the apex. 



The maxillipeds (fig. 7) have the inner lobe bearing at the apex 4 long 

 setaj and several shorter ones, the outer lobe is somewhat narrow and reaches 

 nearly to the end of the second joint of the palp, the inner margin is thickly 

 fringed with setae. In the palp the second joint is much the longest ; the propod 

 is oval, produced at the outer apex slightly beyond the base of the finger; the 

 finger is about half as long as the propod ; all the joints bear long setules as 

 shown in the figure. 



