476 PROCEEDINGS OF THE NATIONAL MUSEUM vou 85 



The first dorsal pore is on 11/12 (31 specimens) but on two worms 

 there are porelike but apparently nonfunctional markings on 10/11. 



The clitellum is annular, extending from 13/14 to 16/17; dorsal 

 pores and intersegmental furrows lacking; setae lacking except on 

 three specimens, on each of which there are a few setae ventrally on 

 xvi, a few further setae ventrally on xiv-xv on one specimen. The 

 pores on 13/14 and 16/17 are functional. 



The spermathecal pores are minute, widely separated, two pairs 

 on 7/8-8/9, often on tiny, glistening, translucent tubercles. On 

 specimens H the pores may be recognizable and apparently normal 

 or abnormal in appearance or unrecognizable. 



Each minute and superficial male pore is at or near the center of 

 a small tubercle of circular to transversely elliptical outline, the 

 tubercle surrounded by several concentric furrows, which are also 

 circular or elliptical. On specimens A, B, C, D, and F the male 

 pore is on the median portion of the male pore tubercle and on the 

 lateral portion of the tubercle there is a gland pore or pores. 



In the specimens H and I the male pores are invaginate, the aper- 

 tures of the invaginations transversely slitlike, the invaginations 

 slight. The slit is surrounded by a circumferential, elliptical lip, 

 which is marked off on its outer margin by a groove also elliptical 

 in outline. Beyond this groove there are 2-3-4 additional, similar, 

 concentric grooves. The aperture of the male invagination may be 

 closed or may gape open so that the interior is visible. In specimens 

 I the lumen of the invagination is nearly filled by a transverse row of 

 two tiny rounded tubercles, each with a pore on the ventral face. 

 In most of the other specimens in place of these two papillae there is 

 a low, transverse ridge, anteroposteriorly compressed and more or 

 less bladelike. The lateral portion of this ridge usually widens as it 

 passes dorsally more noticeably than does the median portion. On 

 the lateral portion of the ridges there is usually recognizable a 

 marking that contains the site of the male pore, but the marldng 

 does not have quite the appearance of a normal male porophore. 

 On the ventral face of the median portion of the ridge another more 

 or less definitely demarcated marking may be visible. 



In the setal circle of xviii (specimens E), separated by 14 or 15 

 setae are two transversely oval, flat areas, each of which is sur- 

 rounded by two or three concentric and rather elliptical furrows. 

 The innermost of the concentric furrows is the deepest, but there is 

 no indication of the presence of a copulatory chamber or parietal 

 invagination. The cuticle adheres tenaciously to the male pore areas 

 and can be removed only by scraping. Although the scraping was 

 done as gently as possible the surface of the areas was more or less 

 damaged, so that pores are not definitely recognizable. The presence 



