106 DE. J. D. F. GILCHRIST ON LARVAL AND 



no trace o£ an exopodite. The third is slightly longer, the fourth short and 

 terminated by three or four spines. The fifth is long, and has six spines on 

 its distal half, the first near the middle, the second small and serrate. The 

 third to sixth are long and differ from other spines noted in being recurved 

 at their tips, which are provided with retrorse spiniiles, so that when the 

 last joint is bent backwards between them, in the manner of a subchela, they 

 form a most effective grasping and retaining organ. The end of this 

 segment is provided with four long spines with antrorse serrations. The 

 last segment is short and ends in a long spine, at the base of which are 

 two long spines, all antrorsely serrated. The whole appendage mny extend 

 beyond the tips of the antennae. 



The jiTst 'pereio'pod (fig. 18) has a stent basal portion, its breadth being 

 about two-thirds of its length. It is provided, like the basipodite of the 

 preceding and following appendages, with a long spine. Such spines are 

 not serrated and are bent downwards and inwards towards the middle line 

 of the body. The second segment is longer, but also stout, well provided 

 with muscles, and has a spine on the dorsal side at its distal end. The first 

 segment of the endopodite is slightly longer than the last and has two spines 

 near its middle ; it ends in three or more spines. The second segment of 

 the endopodite is smaller, and has one large spine and two small ones at its 

 extremity. The third segment is very long, being about four times the 

 length of the preceding, and there are about ten long serrated spines 

 scattered over its length ; nearer to its distal extremity there is a group 

 of four, whose bases are close together in a transverse line, and at its end, 

 where it articulates with the last joint, is a group of about six. The last 

 segment is short and ends in a long spine with two shorter ones at its base. 

 The exopodite consists of a long proximal segment, with two spines near its 

 middle and one at its distal extremity. The remainder of its length is 

 divided up into short segments provided with long plumose setse. 



The second pereiojjod (fig. 19) is similar to the first. 



The third pereioj^od (fig. 20) has the first segment short and stout, with a 

 long spine as in the preceding limbs. The second segment is long and lias 

 a triangular leaf-like projection (the exopodite) at the beginning of the 

 distal third. Three spines, one before and two after the exopodite, occur at 

 this point, but the segment which appears in the next stage is, as yet, not 

 to be seen. At the distal end there are two spines. The third and fifth 

 segments are much longer than in the other leos. 



o o o 



Occurrence of Pliyllosoma of I'l mm. 



The first phyllosomas are readily procured by keeping crawfish with berry 

 in a well-aerated aquarium. So far there has been no further success in the 

 rearing of the young, no decidedly later stages having been observed in 

 confinement. 



