TWO NEW SPK(!tKS OF ONYCHOPHOKA. 493 



111 connection with the crural grooves there are whitish 

 structures of variable size and shape^ according to the part 

 of the body to which the leg belongs and according to the 

 species considered. 



In the male oF the species Horsti there is a whitish 

 papilla of round shape on every leg of the last two pairs, 

 where there is hardly a ti'ace of the crural grooves. On the 

 legs of the geiaital segment the crural groove is surrounded 

 by a thin and irregularly-shaped fold, white in colour. It is 

 specially thickened round the distal angle of the groove. 

 The same arrangement occurs on seven or eight pairs of 

 legs in front of the genital segment (fig. 16), but as we 

 pass forwards the proximal ends of the folds become less 

 marked. On the next six or seven pairs the white folds are 

 reduced to two papilla-like structures, situated close to- 

 gether at the distal angle of the crural grooves, and some- 

 times fused together to form an U-shaped body. There are uo 

 signs of white papill93 or folds on the anterior five pairs of legs. 



In one female of the species Horsti whitish sucker-like 

 structures were observed on all the legs, with the exception 

 of the five anterior pairs. On the last two pairs of legs they 

 were smaller in size than on those in front. These structures 

 in the female present an appearance which is remarkably like 

 that figured in Mr. Sedgwick's monograph, and described as 

 occurring in P. Edwarsdii (compare PI. 28, fig. 12 [15]). In 

 another female of the same species the legs were so contracted 

 that the structures described above could not be seen, the 

 crural grooves appearing as narrow slits. Whether in the 

 male or in the female the renal pores are situated proximally 

 to the above structures, even in those legs of the female 

 where they are only partially developed. 



In the female of the species Weldoui the sucker-like 

 structures, described above in the female Horsti, do not 

 occur. On the last two pairs of legs there is a round papilla 

 similar to that found on the male of the species Horsti. On 

 the legs of the genital segment, as well as on all those 

 situated in front, with the exception of those of the first pair, 



