STUDIES OX THE ECTorARASlTlC TUEMATODES OF JAPAN. H.') 



change. [)L'rlia{)s Iicttef littini;' if to bear the ahi'asion to ^^■llicll it is 

 necessarily exposed dm-inu' the formation of the egg-shell. 



UTEUls^AVitli this name I designate that poll ion oi' the female 

 efferent duet which is continued forwards from tlie oijtyp and opens 

 to the exterioi" oi- into the genital ati'imn when su(;h is present. In 

 Motiocoiijlc it is, ;is already mentioned, whollv ^vanting, the ootv[) 

 o[)ening in this genus directly into the genital atrium. In Calicottjle 

 it is very sliort and is hned hy the continuation of the epithelium oï 

 the ootyp (PI. XL\, fig. 7) ; the cell-houndaries, however, can not be 

 ctbserved satisfactorily. In Kpihddla to(^ the uterus is exceedingly short; 

 in fact it may l)e said to be wanting in K. Jsliil.airdc. On the other 

 hand, in ^Lciiic. Microcoh/Ic, HexacotijJi'^ (Jclucolijl(\ and J Jiclidnplioni the 

 uterus is Nery long, and its wall consists of a mend)rane which is in 

 most cases very thin, Init sometimes very thick and réfringent, as in 

 Microcotijlc rctictiJuld and AxIhc hdcrocrrcd (1*1. \ . tig. 5 ; PI. Nil, 

 fig. 1). In Octocoiijlc, H('j:ücoIijJ('. < fiicliocoijilc, ;uid in all the species oi Mi- 

 crocolijh' except M. sciticnn' ÇV\. \ I. fig. i^). the inner surface of the uterine 

 wall is coN'ered with cilia ; but in all the other species treated of in this 

 ])aper it is entirely naked (I'l. A', figs, i, 2, .'). I. .^ 5 ; ?l. \h Hg. I ; 

 PI. L\. fig. ll^ ; PI. XIV. fig. 3). In Axini' Iwh-rotrroi -dud JJiclidnpImm 

 .st'.s6///.s the uterus is provided with a double laver of muscular fibres 

 consisting of the inner longitudinal and the outer cii'cular fibres 

 (PJ. Aai. fig. 1 ; PI. XI, fig. 4). In Ht'xacoliju', on the other hand, 

 only the circular fil)res are present. 



The uterine wall nï (Jnd\ocolijlc presents some jieculiar asjiects and 

 deserves a se])arate description. Close U) the ootyp the wall of the 

 uterus presents an aspect closely similar to that of the ootyp (PI. X\ I, 

 fig. 5) ; only the ])ilasters are lower and spindle-shaped in cross- 

 section, and some of them are seen to contain nuclei, which aiv mostly 

 oval and contain e;ich a sinu'le nucleolus. Those that do \n)i contain 



