the Genus Nuiykus {Mich.}. 605 



Tlic softer narrower region of tlie sac following this lies for 

 a certain portion of its length in a straight line coextensive 

 with the clitellum — i.e., occupung segments 15, IG. Tiii.s 

 part is euelosed iu a ccchjinic sac and ends at septnni 1(J/17, 

 which is in contact with the liont wall of the large hnrsa 

 co|)idatrix. A further region of the spenuatheeal sac turns 

 ahrn[)tly upwards and lies dorsally. I do not see any 

 diir rence iu structure here, except in the fact th .t, as 

 already mentioned, it ends in a slight dilatation. 



Anteriorly the coelomic sac, which involves loosely the 

 tubular region of the spermathecal sac, and therefore encloses 

 a considerable hollow space in addition to that sac, ajjpears 

 to be continuous with the muscular sacs already described 

 as lying upon the muscular mid region of the spermathecid 

 sac. It connects them together and to the walls of seg- 

 ment 13 ; the wall of this part of the coelomic sac is, 

 however, more closely attached to the surface of the mus- 

 cular section of the spermathecal sac. There is but a narrow 

 cavity \\ithin it. 1 am disposed to believe — but I cannot 

 absolutely prove the matter — that the peri-spermathecal 

 coelomic sac is continuous with the sac lying between the 

 two sheets of njuscle on each side^ -which extend over the 

 muscular region of the spermathecal sac iu the way that has 

 l)een described. As in specimen 13, already descrilicd, the 

 spermathecal sac ends in front in a rather flattened strap- 

 shaped region bending down at right angles^ or nearly so, 

 to the nietlian muscular part to approach the median line 

 of tite body-wall. An actual external orifice, if present, is 

 hardly visible, and it is quite possible that it is plugged, as 

 is the case fur example with species of Eudriloides — e.f/., 

 K. cotterilli, as figured by myself*. 



Neither in " A '^ nor " C^' could I find the crescent-shaped 

 })ore so obvious in " B.^' Futhermore, it is plain from this 

 longitudinal section of the worm that the spermathecal pore 

 is not retracted with the external oriHces of the " ^«eben- 

 taschen.''' iNor could they very well be retracted, I siiould 

 imagine, from a consideration of the structure of these 

 parts. 



This fact of itself is a difference from the other species of 

 the genus, Notykus e/ni/ii, in which ^lichaelsen distinctly 

 states that the spermathecal pore itself can be retracted 

 together with the orifices of the ''Nebentaschcn.^' This 

 could hardly be possible in the present species, and for the 



* "A Cuutribution to our Kiiowk-il^'e of the Uli^ocliietji of Trojiical 

 Eaijtern Africa,'' (^uart. J. Micr. t^ci. xx.vvi. (n. s.), pi. xvii. tig. 10. 



A7in. dh Mcuj. N. Hid. S.jr. 9. Vo/. x. 41 



