oO CALIFORNIA ACADEMY OF SCIENCES. 



iig. oO/*., the section is made tliroiigh the jiinction of the iiephndio-vesicle and the 

 collar, and the ganglion [a. (/I.) below is small, not yet branched. In fig. oOr, the 

 section is made close to the pore where the ganglion [n. </L) is branched. These 

 branches always extend towards the collar, never the other way. Both these sections 

 trom which the drawings were made are not quite in right angle to the longitudinal 

 muscular layer, but slightly slanting. 



The nephidio-stome is rather large, but very transparent and quite difficult to 

 detect. It is flat, rosette-like and placed half-way between sette 1 and 2. The duct 

 descending from it is remarkably thin, straight and never winding. The nephridio- 

 stome is normally situated, piercing the anterior septum as usual. There is no central 

 cell and nucleus larger than the other, but several smaller cell nuclei are visible in 

 the center below the large marginal cells, which are about 16 to 18 in number and as 

 usual placed in a crescent. Between these cells and the real margin of the lip there 

 is a row of smaller cells and nuclei, the latter being slightly lower than the inner 

 large nuclei, but sufficiently situated in the same plane to be seen at the same time. 



Testes consist of two pairs of small bodies, as usually situated in somites x and 

 xi, attached to the septum close to the body-wall in the anterior [)art of the somita. 

 They are deeply lobed and the lobes are very narrow, parallel and generally three or 

 four in number. The testes are free, not enclosed in the sperm-sacs. 



Sperm-sacs (figs. 5 and 6). There are two pair of sperm-sacs, one pair in 

 somite xi and one pair in xii, attached to the anterior septum in the somite, rather 

 high up, but below the oesophagus. The four sperm-sacs are of about the same size, 

 coin[)aratively small, and deeply lolled very much like the posterior sperm-sac in 

 Ocnerodriliis Beddardl, etc., none of the lobes being vei"}' much larger than the other. 

 It must be remarked that the sperm-sacs are not situated in the same somites as the 

 testes, somite x possessing testes, hni no sperm-sacs, and somite xii possessing sperm- 

 sacs, but no testes. The respective sperm-sacs are not connected with each other and 

 there is no median sperm pouch. The trabecula or muscular divisions of the sperm-sacs 

 are numerous and the chambers enclosed by them are comparatively small. 



Spermducts and rosettes (figs. 7, 8, 11). There are two pair of ciliated rosettes, 

 one in xi and one in xii, as usual. They are very large and folded, deeply crumpled and 

 very prominent, occupying about \ of the somite. The funnels are wide, with a 

 slight posterior swelling. The spermducts run backward and sideways, connect in 

 xii, and continue to somite xvii, where they leave the body-wall, ascend slightly and 

 connect into one single duct, which opens out jointly with the prostate, in the 

 posterior part of the somite. The duct does not enter the pi'ostate, but both open 

 jointly in one slit, running parallel to the intersegmental furrow. The spermduct is 

 throughout of the same size, only widening out just previous to entering the rosette. 

 The lower descending part of the duct, between the spermiducal pore and the bend 

 where it starts forward, is slightly narrower than the anterior part. 



