BY J. J. FLETCHER. 993 



the male pores which are not readily determinable ; the papillae of 

 the fifth and of the sixth pairs not quite so close to the median 

 line ; the ventral surface about the bases of the papillse usually- 

 more or less tumid, sometimes forming distinct transverse ridges 

 on which the papillae are situated. The youngest specimens show 

 no trace of these structures ; others show papillse without any 

 or with only slight modification of the surrounding surface ; others 

 again show pore-like depressions or these with the margins only 

 slightly tumid forming rudimentary papillse, situated on distinct 

 transverse more or less intersegmental ridges'^ formed by the ven- 

 tral surface of the posterior one or two annuli of each segment 

 becoming tumid for a space extending dorsad on each side to as far 

 as or beyond the second setae, and more or less completely confluent 

 with a similarly modified portion of the anterior one or two annuli 

 of the succeeding segment, or only one of the two sets may be modi- 

 fied ; the first and second ridges shortest (from side to side), the 

 third and fourth longest (from side to side), most pronounced, and 

 closer together; in this region what appear to be the intersegmental, 

 are only interannular furrows. In adults with girdles the papillae 

 are well-developed, and the ridges usually less distinct, the rem- 

 nants of them appearing as swellings about the bases of the 

 papillse, except in case of the first two pairs which are entirely 

 surrounded by the girdle tissue. In examining a number of speci- 

 mens difierences in detail are common ; rarely an additional pair, 

 or only a single papilla, may be present between xiv and xv. 

 Between viii and ix, and ix and x a pair of similar papillse with 

 sometimes in addition a ventral portion of the preceding one or 

 two annuli modified ; the anterior pair probably carry the fourth 

 pair of spermathecal pores. Occasionally the ventral surface behind 

 the papillse is also slightly modified ; and in one case there is an 

 additional papilla on one side between x and xi. 



♦Possibly after all better regarded as primarily due to the coalescence and 

 extension of the papillse, as the ridges always show some indication of 

 papillae, whereas papillae without ridges are not uncommon. 



