chinp:se p:akthwoums — gates 499 



The single heart of ix is on the left side (2 specimens) or the right 

 side (3 specimens). The hearts of x are large and filled with blood. 

 The last pair of hearts is in xiii (4 specimens). All hearts of 

 ix-xiii pass into the ventral blood vessel. 



The testis sac of x is U-shaped. The dorsal ends of the limbs of 

 the U reach to or nearly to the dorsal blood vessel. The testicular 

 coagulum within the sac apparently reaches dorsally in only one 

 specimen. However, when the sacs of the other three specimens 

 were cut open a thin layer of testicular coagulum was found on the 

 anterior face of each heart. The testis sac of xi is also U-shaped 

 in three specimens, the hearts and seminal vesicles of xi contained 

 within the limbs of the sac, the vesicles and hearts embedded in 

 testicular coagulum. In the fourth specimen the dorsal ends of the 

 limbs of the U have fused above the gut so that a portion of the 

 dorsal blood vessel is within the sac and surrounded by testicular 

 coagulum. The testis sac of xi in this specimen is accordingly 

 annular. 



The seminal vesicles of xii are in contact transversely above the 

 dorsal blood vessel. No primary ampullae are recognizable on the 

 vesicles of xii, but each vesicle of xi is provided with a definite, more 

 or less conical ampulla. 



The prostates extend through some or all of segments xvii-xxi, 

 each prostate cut up into 15-25 or moi-e elongate-fingerlike lobes. 

 The prostatic duct is 6-8 mm long, bent into a hairpin loop, the ectal 

 limb of the loop much thicker than tlie ental limb. In three speci- 

 mens the prostatic duct passes directly into the parietes, and there 

 is no trace whatever within the coelomic cavity of copulatory cham- 

 bers. In the r-jtracted condition the copulatory chambers are club- 

 shaped, narrowed ectally, but this is not at first evident as each cham- 

 ber is bent over onto the parietes laterally while portions of the 

 chamber are covered over by muscular bands, connective tissue, and 

 glandular masses. The prostatic duct passes into the mesial face of the 

 chamber near the ental end, but this also is obvious only after removal 

 of connective tissue. The tracing of the prostatic duct and the gland 

 stalks through the neck of the everted chamber to the markings is 

 easy, as there is little connective tissue. The glands connected with 

 circular genital markings are smaller than those connected with oval 

 markings. 



The coelomic portion of the spermathecal duct is pinkish, short, 

 thick, rather bulbous, and with a smooth surface. The diverticulum 

 passes into the median face of the duct. Ectal to this junction the 

 duct is narrowed, the slender portion within the lateral w^all of the 

 spermathecal chamber. The diverticular stalk is always longer than 

 the coelomic portion of the spermathecal duct and like the latter 



