166 PROCEEDIIs'GS OF THE NATIONAL MUSEUM vol.84 



that the hearts of 10-12 have similar relations. In the sectioned part 

 a distinct siipra-esophageal vessel is present for only very short dis- 

 tances where the esophagus passes through the septa 13/14 and 14/15. 

 The status of the supra-esophageal vessel anterior to 13 has not yet 

 been determined. It seems to end posteriorly in somite 15. The 

 nepliridial system is of the micronephric type, with six or seven 

 micronephridia on each side of anterior somites and about four 

 micronephridia and one meganephridium on each side of posterior 

 somites. 



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 

 extend posteriorly closely parallel and between the epithelium and 

 muscle layer of the body wall until they reach 18, where they leave 

 the body wall and enter the prostate gland at the beginning of the 

 prostate duct. They do not unite before reaching the lumen. 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, and the duct of 

 each is short ; no diverticula were noticed. 



MEGASCOLIDES MACELFRESHI, new species 



Distinguishing characters. — Length of preserved specimen, 155 

 mm. Diameter, 7-8 mm. Somites, 282. Setal distances, approxi- 

 mately ff^: «&:&<?: C6?=6: 2:3: 3; dd is slightly more than one-half 

 of the circumference. Penial setae nearly straight, with distal end 

 rather abruptly curved and tapering; length probably not over 1 mm 

 and diameter less than 0.04 mm. Clitellum 13-21 and incomplete 

 ventrally. Paired ventral papillae on 14/15-16/17 and 19/20. Ovi- 

 ducal pores on transverse elevation on 14 and nearer to seta line a 

 than to median line, Spermathecal pores on 7/8 and 8/9. Calcifer- 

 ous gland in 10-15 with numerous diverticula but of simpler type. 

 Sperm ducts in close contact when they enter the prostata, gland 

 very near its union with the prostate duct and then seemingly unite 

 before opening into the lumen of the gland. Spermathecae paired 

 in 8 and 9. 



Material. — The only specimen available for study is the holotype 

 (U.S.N.M. no. 20244), which was received in living condition from 

 F. M. McElfresh, of Salem, Oreg., in January 1903. The anterior 

 22 somites were split in the median sagittal plane, and transverse 

 sections were made of the part of one-half that included the posterior 

 part of 16 to the posterior part of 22. Transverse and sagittal sec- 

 tions were made from parts near the posterior end to provide mate- 

 rial for a study of the nephridia. The sections were prepared soon 

 after the specimen was received and before the writer realized the 

 desirability of a study of the calciferous gland region and of certain 

 parts of the circulatory and reproductive systems. 



