446 MISS S. M. FEDABB OK EARTHWORKS [Maj"^ 1 7, 



pores between segments vi./vii. In three instances also a similar 

 papilla exists on one side only, while in another worm they are 

 entirely absent. One of these specimens has in addition two 

 median papillas of like form on segments vii. and viii., placed in 

 front of the seta line (c/. the median papillae in P. morrisi) '. 



(b) Near the male pores. These are found on segments xviii. 

 and xix., and are more or less complicated and variable. Some 

 of the younger worms have only a lenticular patch where in 

 the older ones is a circular ciip-shaped papilla on an ill-defined 

 excrescence. Doubtless the patch is an incipient papilla. One of 

 the most complicated arrangements is as follows : — 



Segment xviii. is divided into three rings ; the central and 

 widest bears the setaB and the male pures. These last are placed 

 on excrescences which thin awaj^ to the line of setae ventrally and 

 dorsally. Either side of each pore, i. e. anterior and posterior to it, 

 are two cup-shaped papilla? (fig. 1) pressed one against the other. 



Fig. 1. 



Ventral surface of xviiith segment of Perich/sta cumuli/era, showing the 

 cup-shaped papillae. 



The anterior ring bears five papillae, three on the right side, two on 

 the left, placed in a row with a slight ventral gap. The posterior 

 ring has two papillffi, one on each side, in a line with the male 

 pore. In some other specimens this last pair are intersegmental 

 in position, or else on the xixth segment. One had also a median 

 papilla on this segment. 



Internal Features. 



The gizzard, which is nearly globular, lies in segments viii. and 

 ix., the septum dividing them being absent as usual, and that 

 between segments ix./x. being reduced to threads. 



The last pair of hearts is in segment xiii. They are very well 

 developed. 



1 Beddai-d, P. Z. S. 1892, p. 166. 



