458 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



longest. The dorsalmost caecum may have several tertiary caeca on 

 its ventral margin, these usually ventrally directed. In one speci- 

 men these tertiary caeca are readily noticeable on each side, but the 

 ventral secondary caeca are not visible from above (in the dorsal 

 dissection) and were not noticed until the intestine was rolled well 

 over to one side. It would be very easy to overlook ventral second- 

 ary caeca placed as were these. 



The hearts of x are bound to the anterior face of 10/11 by con- 

 nective tissue. The last pair of hearts is in xiii. All hearts of x-xiii 

 jDass into the ventral blood vessel. 



The testis sacs are unpaired and ventral, one on tlie anterior face 

 of 10/11 and the other on the anterior face of 11/12. The anterior 

 margins of the sacs are bilobecl; in xi the anterior ends of the lobes 

 alone reach to 10/11. The seminal vesicles of xi and xii are large 

 and in contact transversely over the dorsal blood vessel. In xiii 

 there is a j^air of small, stalked pseudovesicles, the head ovoidal or 

 flattened anteroposteriorly into an oval disk. In xiv there is a pair 

 of smaller pseudovesicles, the head rounded or flattened and lobed or 

 crenulated. Tlie prostates extend through xvii-xix or xx. The pro- 

 static duct is 3-6 mm in length, bent into a U- or C-shape, the ectal 

 portion thickened. In the maturest specimen there are large copu- 

 latory chambers projecting conspicuously into the coelomic cavity. 

 In the other three specimens there is no trace of a copulatory cham- 

 ber projecting into xviii, the male pore invagination entirely con- 

 fined at this stage to the parietes. 



The spermathecae are obviously juvenile even in the maturest speci- 

 men. Careful removal of the longitudinal musculature shows the 

 spermathecal duct (?) passing through the parietes without any de- 

 crease in diameter but on the contrary in at least one specimen a 

 slight increase in thickness. The ectal end of this thick duct con- 

 tains the invagination within which is the true spermathecal pore. 

 Pulling the duct out from the parietes leaves an unusually wide trans- 

 verse slit on the intersegmental furrow. The diverticulum com- 

 prises an ectal, smooth, thick- walled but slender stalk and a thinner- 

 walled, sometimes slightly wider, elongate seminal chamber that is 

 bent back and forth in a zigzag fashion, the limbs of the loops 

 approximated and usually all in the same plane. 



Just median to the prostatic duct are two glandular masses pro- 

 jecting slightly into the coelomic cavity. In one specimen minute 

 stalked glands were found among the longitudinal muscle fibers in 

 the region of the preclitellar genital markings. 



Remarks. — The most nearly mature specimen is broken, the sur- 

 face of the anterior segments damaged in places by gravel. An- 

 other specimen is softened. With full maturity the spermathecal 



