BY J. J. FLETCHER, M.A., B.SC. 563 



in somite vi ; after which follows the thin- walled small intestine, 

 which in segments x to xn is provided with three pairs of 

 intestinal glands, vascular poaches without stalks, not grooved 

 dorsally. In somite xvi the large intestine commences, 

 and continues as a wide, straight, sacculated tube through- 

 out the rest of the body. It gives off no cseca in the 

 26th segment such as commonly occur in most species of this 

 genus, nor in any other part of its course. Its walls are more or 

 less coated externally with a layer of small yellowish masses 

 in spirit specimens, which may perhaps be of a similar character 

 to the so-called hepatic tissue of Lumbricus, though it does not 

 also coat the dorsal vessel. There is no conspicuous typhlosole ; 

 I have not yet been able to cut sections. 



Of testes there is a pair in each of segments ix and xn, that is 

 to say two segments intervene between those which contain them. 

 Each testis is a long, racemose, white body attached below and to 

 the mesentery, broadest at its base, and tapering to a point, the 

 distal portion being folded under : thus shortened those of each pair 

 touch in the median line above the intestine. The testes of the pos- 

 terior pair are the larger. Those of the anterior pair are attached 

 below and to the anterior face of the mesentery between segments 

 IX and x, their basal portions being just behind the two posterior 

 spermathecse. The posterior testes are attached below and to the 

 posterior face of the mesentery between somites xi and xn. In 

 each of the two intervening somites- — x and xi — lies a pair of 

 complexly plicated " ciliated rosettes." These lie on the ventral 

 wall, on each side of the nerve cord, and just in front of the 

 mesenteries separating somites x and xi, and xi and xn. They are 

 large and conspicuous, but owing to their being squeezed through 

 the contraction of the worms, and to being long in spirit, they are 

 somewhat distorted, and it is difficult to make out their exact 

 shape. The branches of the vas deferentia leading from these 

 bodies join on each side in segment xn, and the two vasa then 

 continue backwards on each side of the nerve cord to join the 

 prostatic ducts rather close to their origins, and at the ends of the 

 outer legs of the £7-shaped bends. Very frequently on opening 



