ZooL.— Vol. II.] EISPZN—OLIGOCH^TA. • 127 



being correspondingly large. Large sperm-masses in X 

 and XL 



Sperm-ducts and Prostates. — The sperm-ducts are thick 

 but without any thickened muscular investment. When 

 the ducts enter the papilla they actually narrow down. The 

 prostates are thick and rather straight, the glandular part 

 running back some eight somites. The sperm-ducts and 

 the prostates open at the very apex of the papilla, side by 

 side, the sperm-ducts immediately in front of the prostates. 

 Just before the ducts enter the papilla they do not quite 

 equal in width the muscular part of the prostate. The 

 ducts may be seen running close together within their com- 

 mon investment and do not fuse until they reach the most 

 external pore. 



Subgenus Nematogenia, subgen. nov. 



Ocnerodrilus (Nematogenia) lacuum Beddard, 

 panamaensis, var. nov. 



Plate IX, Figs. 55-65, 114-116. 



Definition. ^■l.engih. 55 mm., width at clitellum 2 mm. Somites 1 10-120. 

 Setae strictly paired. Dorsal pores present, tliose in the clitellum surrounded 

 by a wider depression. No setee ab in XVII. Clitellum in 1/2 XV-1/2 XXII. 

 Septa V-X thickened. The two anterior septal glands well developed, the 

 three posterior ones minute. Gizzards two, very small, in VI and VII; sac- 

 culated intestine begins in XIII. Nephridia commence in III, those poste- 

 rior to the clitellum with ccelomic mantle. Spermathecse very large in IX. 

 One pair of tests in XL One pair of sperm-funnels in XI. Racemose sperm- 

 sacs in XII. Ovaries in XIII. Oviducts in XIV. Sperm-ducts, one pair 

 open in XVII jointly with the prostates. One pair of prostates, extending 

 from XVII to XXXIII; in the last three or four somites they are folded. 



Habitat. — Four mature and an equal number of immature 

 specimens from Panama, Central America. Collected Feb- 

 ruary, 1896, by Professor Charles H. Gilbert. The speci- 

 mens were preserved in a five per cent, solution of formalin. 



Affinity. — The variety differs from the species from 

 Lagos, Africa, as described by Beddard, in the following 

 particulars: — 



