20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 7& 



There are 10 to 12 setae between the male papillae; 12 is the number 

 found most frequently. There are 14 to 16 setae between the lines 

 of the spermathecal pores on segment viii. Setae are always present 

 on the ventral region of the last clitellar segment (xvi), the number 

 varies from 2 to 7. Setae are always lacking on the last 3 to 6 seg- 

 ments, and are usually few in number and confined to the ventral 

 region on the last segment on which they occur. 



The genital papillae are paired on one or more, or all, of segments 

 vii, viii, xix, and xx, and are always located on the anterior border 

 of the segment. Unpaired median papillae of the same size and 

 appearance are occasionally present on the anterior region of one or 

 more of the segments just mentioned. 



The prostate is often smaller than in the 

 type and is sometimes represented only by a 

 few nodules on the ental end of the prostatic 

 duct. When the prostate is vestigial the 

 duct is usually quite straight. 



The spermathecal ampulla is conical and 

 more than twice as long as the duct from 

 which it is sharply delimited. The narrow 

 tubular diverticulum is longer than the duct 

 and ampulla together and is constricted near 

 the ental end. The short portion beyond 

 the constriction is slightly thicker than the 

 Figure 10.— pheretima minuta. rest of the diverticulum. Frequently the 

 SPERMATHECAX ABOUT 14 divcrticulum cctal to the constriction is 

 longer than the duct and ampulla together. The figure is character- 

 istic, the spermathecae varying from one worm to another only in 

 the length of the diverticulum. 



PHERETIMA ORNATA, new species 



Description of the type-specimen, external characteristics (Cat. No. 

 19254, U.S.N. M,).— Length, 137 mm. Diameter, 6-8 mm. Number 

 of segments, 106. Color: Dorsally bluish gray, ventrally very light 

 grayish. The clitellum is darker with a reddish-brown tinge. 



The prostomium is epilobous, but the furrow at the posterior end 

 of the prostomial tongue on segment i is lacking. 



On segments ix-xiii there are two secondary furrows per segment^ 

 one anterior to and the other posterior to the setae. Posterior to the 

 clitellum there are usually two furrows per segment similarly placed. 



The first dorsal pore is in intersegmental furrow 11/12. 



The setae begin on segment ii and are located on distinct ridges 

 from iii on. No setae are visible on the clitellar segments. The 



