168 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



in 7-9, which presumably are dorsal hearts, and larger ones paired 

 in 10-13, which probably are dorso-esophageal hearts. The nephrid- 

 ial system is similar to that of other species of Meyascolldes and is 

 micronepliric in the anterior region, and in the posterior region, in 

 addition to five or six micronephridia on each side of each of most 

 somites, there is a pair of meganephridia in each somite. 



A pair of spermaries and of spermiducal funnels is present in each 

 of somites 10 and 11, and the two sperm ducts of either side are 

 closely parallel and extend posteriad between the nmscular layer and 

 epitheliiun to 18, where they become separated from the body wall, 

 and to the prostate gland, which they enter near its union with the 

 proximal end of the prostate duct. The two sperm ducts seem to 

 unite just before reaching the hunen of the gland. There is a pair 

 of sperm sacs in each of somites 11 and 12. A pair of prostate 

 glands is present in 18 that are long and contorted and occupy much 

 space, displacing the septa of adjacent somites. A pair of ovaries 

 and of oviducal funnels is present in 13. A pair of spermathecae 

 is present in each of somites 8 and 9 which have very short sperma- 

 thecal ducts and seem to lack visible diverticula. 



MEGASCOLIDES MICHAELSENI, new species 



Distinguishing characters. — Length of strongly contracted speci- 

 mens, 95-110 mm. Diameter, 4.5-8 mm. Number of somites in 

 eight specimens averaged 202. Setal distances in anterior part ap- 

 proximately aa : a6 : &c : C6?= 10 : 2 : 7 : 4 ; dd about three-fifths of the 

 circumference; penial setae very closely paired, long, slender, nearly 

 straight except near distal end, where there is a rather abrupt curve 

 with the terminal part at nearly a right angle with the main part and 

 directed anteriad. The curved and terminal parts are finely sculp- 

 tured. Length of each, 2 mm or more; diameter, 0.07 mm or less. 

 The clitellum includes 13-19, is incomplete ventrally, and is slightly 

 tan-colored. Median, ventral, transversely elongate papillae on 11/12, 

 12/13, 14/15, 15/16, and 16/17. Paired ventral papillae on 19/20 

 and in most specimens on 20/21. Spermathecal pores on 7/8 and 8/9 

 in line with setae ab. 



Septa 6/7-10/11 are strongly thickened and 11/12 and 12/13 less 

 thickened. Calciferous gland in 10-15. The pair of sperm ducts of 

 either side remain separate and unite with the prostate duct very 

 near its proximal end. Spermathecae paired in 8 and 9. 



Material. — Ten specimens were collected at Netarts, Oreg., and 

 received in February 1931. The specimen selected as the holotype 

 (U.S.N.M. no. 20245) was split in the median sagittal plane of 

 somites 1-22, and one-half was removed and cut into transverse sec- 

 tions. Transverse and longitudinal sections from two other specimens 

 were also made and studied. 



