﻿262 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 102 



not reaching beyond the tip of the anterior ventral process ; maxillae 

 and maxilliped crowded together as in adult. Claws of second maxilla 

 short and weak, as noted for immature forms of P. -flores. Anterior 

 ventral accessory processes very small spines; the membranous flap 

 of the posterior process hardly separated from the tissue of the ventral 

 face, but the outline discernible. 



Legs 1-3 completely segmented, with the laminae also well devel- 

 oped. Leg 4 with all the segments indicated, but very short, the whole 

 structure appearing thin ; all the spines, including the inside marginal 

 ones, present but very short and weak. Rudiment of leg 5, a lobe 

 hardly differentiated from the surface and bearing three short setae, 

 present ventrally on the proximal surface of the genital process near 

 the outer edge (pi. 14, fig. 4, a) ; leg 6, represented by a single seta at- 

 tached to a minute lobe, located anterior to the fifth pair, the seta 

 projecting beyond the margin of the gfenital segment. 



This form is closely similar to that described as stage h for P. -flores^ 

 and undoubtedly represents the same period in development. That it 

 can properly be interpreted as a chalimus stage, though a very late 

 one, can be seen not only from the shape and size of the genital segment 

 and abdomen, but by the incompleteness of segmentation of the latter. 

 The appendages, though completely segmented, are thin and weak, and 

 the claws of the second maxillae have not assumed the adult form. 

 In addition, legs 5 and 6 are at the height of their development, re- 

 quiring passage through another stage before disappearing. 



Stage c (pi. 14, fig. 5) : One specimen, male attached. Total length, 



11.0 mm.; cephalothorax, 6.5 mm.; posterior part of body, including 

 caudal rami, 4.5 mm. ; width of carapace, 6.5 mm. 



Genital processes only slightly longer than in stage 2>, but abdomen 

 considerably longer, showing division into three segments. 



All appendages more strongly developed than in preceding stage. 

 Distal extension of inner piece of first maxilla reaching well beyond 

 the tip of the anterior ventral process. Claws of maxilla 2 as in the 

 adult. Spines of leg 4 considerably longer and thicker. Ventral ac- 

 cessory processes as in stage &. Legs 5 and 6 still present, but the 

 setae much shorter than in preceding stage. 



"V^Hiether this stage is to be interpreted as a chalimus or a growth 

 form of the adult is not clear. Although the appendages are more 

 strongly developed than in Stage &, they are still thin and weak com- 

 pared to the young or adult female. In addition to the comparatively 

 short abdomen and the small genital segment, there are still present the 

 rudiments of legs 5 and 6. 



Young female (pi. 14, fig. 2) : Three females, measuring between 



13.1 and 13.5 mm., show differences in the length of the processes of 

 the genital segment: Slightly shorter than the anal segment (as fig- 



