246 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



There is no heart-body. The dorsal vessel is generally, 

 but not always, situated on one side of the body. It is 

 much larger in XII and XIII. 



Testes. — There is one pair of testes in somite X, occupy- 

 ing the usual position. They extend backwards and con- 

 nect with a median, dorsal sperm-sac, which extends to the 

 middle of somite XII. 



Ovaries. — There is one pair of ovaries in somite XI, ex- 

 tending from the anterior septum backwards, and filling a 

 large part of the somite. The oviducts are very small; the 

 ovipores are in front of and in line with the ventral fascicles 

 of set£e in XII. 



Sfermathecce. — The spermathecse are simple sacs, one- 

 half shorter than those figured for T. Vejdovskyi. They are 

 strongly muscular from the apex to the pore. There are no 

 spermatophores. 



Sperm-ducts and Penis. — These organs, which open on< 

 XI, resemble those figured for T. Vejdovskyi. There is no 

 chitinous sheath in the penis, and I have reason to think 

 that there is none in the other species of this genus. The 

 atrium, into which open the many prostates, is always 

 strongly bent, either sideways, forwards or backwards. It 

 is strongly muscular, the muscular layer being circular. 

 The sperm-duct joins the atrium abruptly, and is about one- 

 third narrower. It descends downwards at once, with a few 

 slight folds, and then widens out to a flaring funnel which is 

 invested in the septum X/XI. The penis itself projects 

 alongside of a rather strong copulatory cushion situated 

 immediately dorsal to the male pore. Between it and the 

 ventral fascicle of setae there is a deep pit, through which 

 the penis is protruded. There are ten to fifteen prostate 

 glands of about the same diameter as the atrium. 



Nefhridia. — There are no nephridia in the genital somites. 

 Posterior to the clitellum the nephridia commence in somite 

 XVI. Only the posterior nephridia are covered with large 

 bladder-like peritoneal cells. 



