232 WALTER E. COLLINGE. 



the developing one within, and c a later stage, in which part 

 of both the a and h stages are present. There are a number 

 of lateral setas given oif from these spines in all stages. 

 Whether or not this represents an incipient ecdysis or a 

 condition in which the new spine, previous to a general 

 ecdysis, is found within the old one, I am unable to say. 

 On the dorsum of the mesosomatic segments the spines are 

 very similar, but the edges of all the segments show numerous 

 peculiar setse. On the metasome the spines are shorter and 

 stouter (fig. 11). On the antennee, and the appendages of 

 segments 2-8 of the mesosome, the spines and setee are not 

 abundant ; they are of the usual character, but those towards 

 the distal portion of the uropoda are more like those on the 

 meso- and metasome. 



Between the large spines of the mesosomatic segments 

 there are distributed two sets of setse which both arise from 

 small bulbous bodies (fig. 7) ; the larger of the two show an 

 indentation at their apex from which a short hair-like seta 

 arises (fig. 13), whilst in the smaller ones two or three setae 

 arise from the summit. 



The whole of the body and appendages are covered with 

 a series of prominent scales varying in shape in diiferent 

 regions (figs. 8, 12 and 14), and a series of fine thread-like sette. 



I have been unable to find any antennulae, and believe that 

 they are absent. 



The cephalon is strongly arched, and has three transverse 

 rows of spines, whereas there are only two rows on the 

 segments of the mesosome and a single row on those of the 

 metasome. 



The oral appendages do not call for any special mention. 

 All the appendages of the mesosome are feebly developed. 



The uropoda are small, and do not extend beyond the 

 telson. The basipodite is a thickened plate, triangular in 

 section, with a prominent diagonal ridge, formed partly by a 

 slight elevation of the plate in this region, and partly by 

 four rows of scales ; towards the inner margin the scales 

 become lanceolate in shape and overlap, and partly surround 



