THE OLIGOCH^TA TERRICOL^. PART I. 



183 



line and it closely embraces the bursa. The duct opening into 

 the bursa varies in form. In one example it was quite straight, 

 and therefore very short, thus contrasting with that of P. ben- 

 guetensis. In others, however, there were varying degrees of 

 curvature in this duct, and corresponding to this a slight dif- 

 ference in the actual point of opening into the terminal bursa. 

 The sperm ducts can be seen to unite where they approach their 

 opening into the spermiducal duct as in P. bengiietensis. 



Pheretima benguetensis sp. nov. 



Collected like the last species at an altitude of 1,524 meters 

 in the Province of Benguet, Luzon, were several examples of a 

 large Pheretima which is undoubtedly like the last species in 

 many particulars, but which I am nevertheless disposed to 

 regard as distinct from P. decipiens. 



Table I. — Measurements of the four large specimens of Pheretima 

 benguetensis. 





Diameter. 



Length. 











Anterior. 



Posterior. 



190 



12.5 



10.00 



150 



12.0 



9.75 



158 



11.5 



9.00 



' 188 



11.6 



9.00 



Thus the length may be fairly described as 190 millimeters 

 and the diameter at the head as 12.5 millimeters. The meas- 

 urements of length, however, are obviously only approximate, 

 for in one of the longer and one of the shorter individuals the 

 last segment of the body bore a complete circle of large setae, 

 and the anus showed signs of regeneration. In the other two, 

 on the contrary, the last 2 or 3 segments bore no setse, and the 

 anus presented a normal appearance. The former, therefore, 

 have clearly been injured during life and were originally some 

 segments longer. The color of the large individuals was in 

 every case dark purplish-blue on the dorsal surface, passing 

 into pale brown ventrally. Dorsally, an iridescence was plainly 

 visible in certain lights. 



The segmentation of the body offers certain features which 

 are characteristic. The first 9 segments of the body form a 

 kind of "head" which is very sharply marked off from the rest 



