24 G- O- Sars. 



a narrow lobe, the proximal one being only setiferous on the 

 outer edge and extending about to the middle of the epipodite. 

 The distal lobe is somewhat longer, though not nearly extend- 

 ing to the end of the 5th endite, and is setiferous all round. 



The 9th and 10th pairs of legs (see fig. 5) are markedly 

 distinguished by the great prolongation of the proximal 

 lobe of the exopodite, which forms a long, and somewhat 

 twisted threadlike appendage, serving to keep the egg-mass 

 in its place 



The succeeding pairs become gradually much reduced in 

 size, and on the last pair (fig 8) the epipodite is quite rudi- 

 mentary, and also the endites very small, whereas the exopo- 

 dite is comparatively less reduced. 



The tail (fig. 9) about equals in length tlie 5 preceding 

 segments combined, and carries dorsally, in front of the caudal 

 setæ, 2 pairs of juxtaposed short spines. The posterior lamel- 

 lar expansions are each produced at the end below to a very 

 large dentiform projection, and their nearly straight posterior 

 edge is divided into about 9 much smaller and nearly equal 

 denticles. The caudal setæ are comparatively small, but 

 distinctly biarticulate and finely ciliated. The caudal claws 

 are very long and slender, but very slightly curved, and pro- 

 vided at their base with a few small bristles, the outer part 

 of the concave edge being very finely denticulated. 



The ova occurring in the matrix (see fig. 5) are rather 

 numerous and are accumulated into an oval mass, being appar- 

 ently held together by some glutinous matter. This egg-mass is 

 generally found in the foremost part of the matrix, just behind 

 the umbonal part of the shell, and is kept in place by the 

 thread-like appendages of the 9th and 10th pairs of legs. 

 Viewed with a high magnifier, each egg (figs 11, 12) is found to 

 exhibit externally a very peculiar sculpture, being encircled 

 by a number of coarse ribs connected by secondary elevated 

 stripes, between which are shallow sulci. This sculpture docs 



