146 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 55. 



SYNGENODRILUS, new genus. 



Prostate gland pores, distinct from spermiducal pores; m close 

 proximity to ventral pairs of setae. Spermiducal pores, one pair; 

 anterior to oviducal pores. Oviducal pores on 14. Gizzards anterior 

 to 10. Posterior " hearts " in 11. Meganephric. Spermaries and 

 spermiducal funnels, enclosed in sperm vesicles. Prostate glands, 

 not connected with sperm ducts. Ovaries in 13. Ovisacs extend pos- 

 teriorly from 13 through several somites. Spermathecae, without 

 diverticula or appendages. 



Genotype. — Syngenodrilus lamuensis, new species. 



SYNGENODRILUS LAMUENSIS. new species. 



Length, 5.2 cm. Diameter (maximum), 0.4 cm. Somites, 137. 

 Clitellum, 11-16; cingulum. Genital papillae, none obvious. Setae, 

 very small ; aa : ab : be: cd=17 : 1:17 :\^; dd= y\ circumference. Ne- 

 phridiopores, first on 4 ; at anterior margin of somite ; some midway 

 between seta line cd and mid-dorsal line, others in seta line cd. 

 Spermiducal pores, inconspicuous; at anterior margin of 13; slightly 

 ventrad of seta line cd. Prostate gland pores, 11, 12, and 13, slightly 

 dorsad of seta line b. Oviducal pores, on 14, slightly anteriad and dor- 

 sad of b. Spermathecal pores, paired in 7/8 and 8/9; slightly ven- 

 trad of seta line cd. Septa 5/6-7/8, very strongly thickened; septa 

 8/9-12/13, very thin and somewhat displaced and imperfectly de- 

 veloped. Two gizzards in 8 and 9. Hearts, 6-11. Nephridia, paired ; 

 lacking in 1-3 and 11-12. Paired spermaries and spermiducal 

 funnels, inclosed in paired sperm vesicles in 10 and 11. Sperm ducts 

 of each side, much contorted and unite into a single duct, which is 

 without penial or atrial modification. Prostate glands, small; one 

 pair each in 11, 12, and 13. Sperm sacs, one pair included within 

 ovisacs and extend posteriorly to 20. Ovaries, extensive; in 13. 

 Oviducal funnels and ducts, broad and short. Spermathecae, simple ; 

 long and slender; paired in 8 and 9. 



One specimen, collected at Mkonumbi near Lamu, British East 

 Africa, by William Astor Chanler in 1892. 



Holotype.— Cat. No. 16833, U.S.N.M. 



The specimen in alcohol is apparently considerably contracted and 

 without obvious color differentiation. Sagittal sections were made 

 from one half of the anterior 22 somites, the other half being left 

 united with the remainder of the worm. The alimentary tract had 

 of course not been freed from dirt before preservation and the clitel- 

 lar hypodermis proved to be rather difficult to section ; and hence the 

 series of sections is defective in some respects, although on the whole 

 it is very good and has made possible the determination of some facts 

 in the anatomy which could not otherwise have been obtained. 



