30 fAI.Il'OKNIA ACADEMY OV SflEXCES. 



lij;. ')()/;., tlu! >^ofti()ii is iiiiuU; lliioiij^li llii- jiiiiclioii of tlic iic|iliri<lii)-\ (-.-iclu ami (lie 

 I'oUiir, and the gaii<;;lii)ii (n. ijl.) ht-low is small, not yet l>ranc]ic(l. In li<^. o(J'', the 

 st'c-tinn is made close to the pore win ic llie ganglion {n. ijl.) is liranehed. Tiiese 

 I III! ncln-f^ always extend towards the collar, never the other way. Both these sections 

 'rom wlii(di (he drawings were made are not <|nile in right angle to the longitndinal 

 nuiscular layer, but slightly slanting. 



Thii nephndio-sfoine is rather large, but very transparent and (piite dillieult to 

 detect. It is flat, rosettc-liUe and placed half-way between seta' 1 and *J. 'IMic duct 

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

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

 cell and nucleus larger than the (diier, l)ut several smaller cell nuclei are visible in 

 the center below the large marginal cells, which are about Ki to 18 in number and its 

 usual placed in a crescent. Jietween 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, l)ut sufficiently situated in the same plane to be .seen at the same time. 



7('s/e.s 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 part of the somite. 

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

 foui' in numlx-r. The testes are free, not enclosed in the sperm-sacs. 



iSperm-sacs (figs, o and <i). 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 (esophagus. The four sperm-sacs are of about the same size, 

 comparatively small, and deei)ly lobed very much like the posterior sperm-sac in 

 Or/nerndrUiiH Beddardi, etc., none of the lobes being very much larger than the other. 

 It must lie remarked that the s|)erm-sacs are not situated in the .same .somites as the 

 testes, somite x possessing testes, but no sperm-.sacs, anil 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 llic chambers enclosed by them are comparatively small. 



S/wrinditcffi II ltd roset(e>i (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 tlu; .somite. Tln' funnels are wide, wiili a 

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

 xii, and continue to somite xvii, where they leave the l)ody-wall, ascen<l slightly and 

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

 po.sterior part of the somite. The duct does not enter the piostate, but lioth opi'u 

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

 thi'ougbout of the same size, only wiilening out just previous to entering the rosette. 

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

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



