208 



THE VOYAGE OF H.M.S. CHALLENGER. 



edges are armed in their outer part with numerous small denticles, and have moreover, 

 near the base, on either side, three somewhat coarser denticles placed at some distance 

 from the rest. The apex (fig. 23) is abruptly truncate, and bears six rather strong spines, 

 the innermost jtair the largest, and, between the latter, three very small denticles occur, 

 besides two rather long and delicate setae (omitted in the figure). 



The uropoda (fig. 24) are rather large, projecting considerably beyond the telson. 

 The inner plate is narrow lanceolate, with the auditory apparatus very fully developed, 

 and the inner edge, beneath the marginal sette, densely spinose. The outer plate is 

 appreciably shorter than the inner, Init rather broader, with the exterior edge armed, in 

 front of the terminal linguiform articulation, with about six spines, increasing in size 

 posteriorly. 



As regards colour, the animal, according to Dana, is in a living state almost colourless, 

 though sometimes purply along the ventral face of the tail, and tinged with red at the 

 sides of the anterior division (the marsupial pouch). This purplish and reddish colour is 

 found to arise from stellate pigmentary deposits distrilmted with great regularity and 

 still retained in the specimens preserved in spirit. Thus, along the ventral face of the 

 tail is seen (figs. 1, 2, 3) on each segment a median and two lateral pigment-spots, 

 the one occurring at the end of the last segment being considerably ramified. On the 

 two posterior exposed segments of the trunk, similar pigment-spots may be seen, and 

 on either side of the marsupial pouch in the female (fig. 2), an exceedingly ramified 

 reddish pigmentary deposit may with facility be discerned. Moreover, at the inner side 

 of the antennular peduncle, similar pigmentary ramifications occur, extending to a 

 greater or less distance even into the inner fiagellum. 



Habitat. — All the specimens in the collection were taken nt the surface of the sea. 

 The following is a list of the localities, with dates appended : — 



