438 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 85 



Tliere is a pair of commissures belonging to ix or a single com- 

 missure on the left side. The last pair of hearts is in xiii (2 speci- 

 mens). All hearts of ix-xiii pass into the ventral blood vessel. 



The testis sacs of x and xi are ventral and unpaired. The seminal 

 vesicles of xi and xii are firm vertical bodies filling their segments 

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

 xiv of one specimen there are paired pseudo vesicles, the vesicles of 

 xiv of about the same size as the vesicles of xiii. The prostates ex- 

 tend through xvii-xix. The prostatic duct is about 10 mm long, bent 

 into a C-shape; the ectal two-thirds much thickened. On the floor 

 of xviii on each side and just median to the ectal end of the prostatic 

 duct is a large glandular mass, which can be separated with care 

 into several discrete glands, from each of which a bundle of cords 

 or ducts passes to a genital marking. In each copulatory chamber 

 there are 5 or 6 genital markings; the markings circular to oval, flat- 

 surfaced but protuberant. The minute male pore is on a rather flat- 

 tened out but still conelike plate or tubercle, which is smaller than 

 the genital markings. 



The spermathecal duct is stoutish, shorter than the ampulla, nar- 

 rowed very abruptly within the parietes just lateral to the glandular 

 mass on the spermathecal chamber. Wlien the duct is pulled out 

 carefully from the parietes a circular area, the surface of which is 

 nearly level with the coelomic face of the body wall, becomes visible. 

 At the center of this area there is a tiny depression from which the 

 narrowed portion of the duct has been removed. The diverticulum, 

 which passes into the median face of the duct close to the parietes 

 comprises a firm, glistening stalk and a longer, thin-walled, seminal 

 chamber. The latter may be looped in a regularly zigzag fashion, 

 the limbs of the loops in apposition. The diverticulum (in the 

 looped condition) is as long as or longer than the combined lengths 

 of the duct and ampulla. 



The spermathecal chamber is large, club-shaped, narrowed toward 

 the parietes (i. e., ectally), bent backward and bound to the coelomic 

 floor by connective tissue. This tissue, however, can be cut readily 

 so that the chamber is separated from the ventral parietes. The 

 posterior wall of the chamber (that in contact with the ventral 

 parietes) is thin. On the anterior face of the chamber is a large 

 flattish mass of glandular tissue, oval in outline. From this glandu- 

 lar mass ducts pass to the large, oval, genital marking within the 

 .spermathecal chamber. The circular area, with a central depression 

 which becomes visible on removal of a spermatheca, is the dorsal face 

 of a thick tough column of tissue, which passes into the lateral wall 

 of the spermathecal chamber. The narrowed portion of the sper- 

 mathecal duct is continued through this column to open to the ex- 



