FABACOEOPHIUAI EXCAVATUM.— CHILTON. 



49 



reach quite to the end of the propod, the other (inner) margin being apparently- 

 free from seta? ; the carpus is short, triangular in shape, widening greatly distally, 

 its posterior border bears long hairs and there is an oblique row on the outer 

 surface ; the propod is oblong-oval, as wide at the base as the carpus, but becoming 

 slightly wider distally; both anterior and posterior margins are convex, the 

 posterior one being produced into a long slender curved tooth, separated by a 

 deep depression from a similar but shorter tooth arising from the middle of the 

 palm ; the finger is short, not reaching quite to the end of the palm. 



In the female the second gnathopod (fig. 11) has the scoop-like process 

 on the merus as in the male, but differs greatly in the carpus and propod, both 

 of which are much longer and more slender, as shown in the figure ; the carpus 

 is longer than the propod and has the posterior margin fringed with two widely 

 separated rows of long sette ; the propod is slender and ends simply, being 

 almost entirely without palm. In some cases the end of the propod is narrower 

 than is shown in figure 11. 



10b 



Fig. 10b. — Second gnathopod, male, immature (Roto-iti specimen), 

 rig. 11. — Second gnathopod, female (Brisbane specimen). 



In the young male the second gnathopod appears to be at first similar 

 to that of the female, the adult male characters being gradually developed. 

 Figure 106 shows an intermediate stage in which the carpus and propod, though 

 broader than in the female, are still somewhat narrow; the propod has the 

 posterior margin produced into a tooth only half the length it afterwards 

 becomes, while the tooth in the centre of the palm is hardly yet apparent ; the 

 dactyl reaches slightly beyond the end of the palm in this case. This figure is 

 drawn from a Lake Roto-iti specimen. I have a similar one mounted from 

 Brighton (fig. 10a) in which the defining tooth of the palm is still shorter and 

 the finger overlaps the palm as it does in the female. 



The first (fig. 12) and second perceopoda are of normal shape and do not 

 call for special description. 



In the third perceopod (fig. 13) of fully developed animals the basal joint 

 is very large and much produced posteriorly, the posterior margin being fringed 

 with long seta?. The carpus bears at its postero-distal angle 4 strong curv-:-*! 



D 



