178 MK. A. U. MICHAEL Olf AN [Mat. 5, 



outside their postero-lateraJ edges. The genital opening itself is a 

 longitudinal slit closed by soft labia in both sexes. 



The epimera of the first pair of legs are fringed on the edges 

 nearest the median line of the body by a series of beautifully 

 feathered or pectinated hairs (fig. 6), which vary considerably ; three 

 or four at .the anterior are curled over at their ends and plumose, 

 the remainder are some finely (fig. 8) others more coarsely (fig. 7) 

 pectinated ; most of them are terminated by a long fine spine, which 

 is not pectinated. There are a few very small, curved, colourless 

 hairs on the epimera and the hind margin of the body. 



Legs (&gs. 12, 13). — The legs gradually increase in length from 

 before backward ; they are entirely chitinized and entirely without 

 swimming-hairs ; they are terminated by strong didactyle claws ; 

 the tarsi, particularly the two hind pairs, are enlarged at their 

 distal ends and excavated so as to form deep cups. All the legs 

 are armed with a number of large orange-scarlet spines, or spines 

 tipped with that colour, Mhich form the most striking feature of 

 the species ; they are mostly lanceolate or laurel-leaf shaped, but 

 some are straight ; the largest are arranged in radiating whorls 

 round the distal ends of the third and fourth joints of the first pair 

 of legs and the third, fourth, and fifth of the other pairs: there are 

 also two large spines, one on the underside of the second joint 

 of each second leg, and several similar but smaller spines on the 

 upperside of the same joints in the first three pairs of legs 

 and the underside of the fourth ; there is also a pair at the distal 

 end of the tarsus of the third and fourth legs, curving over and 

 protecting the claws. There are lines of somewhat similar, but 

 uucoloured, spines on the outer edges of the fourth coxse. There 

 are numerous other hairs on the legs, particularly on the outer side 

 of the fourth legs ; these hairs are mostly strongly curved, colour- 

 less, soft, and diminishing to a point ; there are smaller fine hairs 

 on the tarsi. 



The Integument (Plate VII. fig. 11 ; Plate IX. figs. 23, 24, 25). 



This varies in thickness in different parts of the body ; it may 

 be said to consist of three layers, or it might be considered two 

 layers, the outer being double. Treating it as three layers, the 

 outer, which may be called the " epiostracum " (fig. 24, ej).), consists 

 of a single row of epithelial cells, rounded or conical on the outer 

 side, flat on the inner side ; these cells form the papillae with which 

 the soft parts of the body, particularly the dorsal surface, are 

 coated externally. They ai'e loosely arranged and vary in form a 

 good deal in different parts of the creature; those towards the, 

 anterior end being, as a rule, the most papillose. The second layer, 

 which may be called the "ectostracum " (figs. 24, 25, ec), consists 

 also of a single row of cells ; but they are more cubical and form a 

 dense and thoroughly united tissue with a flat surface on both sides : 

 otherwise the cells are no doubt of the same nature as those of the 

 outer layers, the latter being more or less transformed or perishing. 

 The inner layer (figs. 24, 25, M.), w hich may be called the " end- 



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