DECAPODA. 209 



The three pairs of maxillipedes (figs. 6, 7, and 8) have long esopods tipped with three 

 or four long hairs. The endopod is four-jointed, the joints being narrow and subcylindrical, 

 and each provided with one or two setae. In the first two pairs the endopods are shorter 

 than the exopods, in the third pair they are equal, or the endopod is slightly the longer. 

 In the larger specimens in this stage buds representing the first appearance of the 

 two anterior pairs of pereiopods may be observed. Those of the first pair are longer than 

 those of the second, and are curved forwards between the bases of the outer maxillipedes. 

 In the next stage of the development the uropods are free, the telson is, however, still 

 more or less laminar, and the abdominal somites are not provided with pleopods. 

 Seventeen specimens with these characteristics, measuring from 5'0 to 6-6 mm., are 

 present in the collection (PI. 14. figs. 9, 12, 15, 20, and 21). 



The rostrum is relatively shorter than in the previous stage, being about two-thirds to 

 one-half the length of the carapace ; the large blunt spine at its base persists, and in one 

 of the specimens two very minute teeth are found in front of it. The blunt tooth in the 

 mid-dorsal line of the carapace near the hinder margin is still present, and a few very 

 minute teeth may usually be seen on the posterior basal edges. The characteristic hump 

 of the 3rd abdominal segment is more pronounced and elbowed than in the earlier stao-e ; 

 a notch is present in the mid-dorsal line of the 4th somite near the posterior edge, and 

 the 6th somite is about three times the length of the 5th. The telson (figs. 20 & 21) is 

 still somewhat foliaceous and is subparallel, or rather wider at the apex than at the base. 

 Distally it is emarginate, and, as in the earlier stage, bears eight pairs of sette. The 

 uropods are free, the outer in the older specimens bearing a spine on its outer distal edge. 

 The endopod is at first short, but rapidly attains to the ^same length as the exopods. 



The eye (fig. 15) has not kept pace with the growth of the carapace, being now little 

 more than half its length ; the cornea is still the widest part. The basal joint of the 

 antennular peduncle is very much longer than the 2nd and 3rd combined; it possesses 

 no lateral process, but is proximally somewhat swollen on its outer edge. The outer 

 flagellum is still quite rudimentary, being little longer than the ultimate peduncular joint ; 

 it bears a long apical seta. The inner flagellum has now appeared and is about half the 

 length of the outer ; the long seta present in the earlier stage has been carried up on its 

 apex. The antennal scale (fig. 12) is longer than the one-jointed bcisal segment and reaches 

 to the end of the 2nd joint of the antennular peduncle ; it is furnished with numerous long 

 setae and with a stout spine at its outer distal edge. The long seta which represented 

 the flagellum in the previous stage has disapjieared and a short thick protuberance, from 

 one-fifth to one-third the length of the scale, has taken its place. 



During the course of this stage the first three jjairs of pereiopods with their exopods 

 are developed; in structure they resemble the outer pair of maxillipedes. 



All the remaining specimens in the collection, with the exception of two measuring 123 

 and 12-5 mm., belong to the next stage, in which uropods, pleopods, and all five pereiopods 

 are developed, while the eyes remain of relatively large size and are widest across the 

 cornea. These specimens measure from 9-1 to 13'4 mm. (PI. 14. figs. 10, 13, 16, 22, 

 and 23). 



The rostrum is less than half the length of the carapace and is furnished dorsally with 



