NEMATODE GENUS PHYSALOPTERA. 



1015 



left spicules are respectively^ 300 and 360 n long, and only the 

 left has a pointed tip. In my material the spicular lengths are 

 as follows : right 495 jj., left 740 /m, i. e. the right is more 

 than half as long again and the left twice as long. Both of 

 them terminate in sharp points. 



These, besides other minor differences, e. g. size of egg, length 

 of ovijector, position of the vulva, etc., seem to indicate that the 

 specimens studied by me belong to different species ; and as I 

 examined what I take to be the type-material, I think Seurat's 

 specimens must be regarded as a new species, which, however, is 

 very closely allied to Ph. clausa, as shown by the nature of the 

 teeth and mode of origin of the two uteri. 



Text-figure 4. 



PJii/saloptera clausa Rud. 

 A = Caudal extremity of male. B = Spicules. 



Schneider (1866) states that the inner teeth are smaller than 

 the outer, and figures a male bursa having the papillae arranged 

 very similarly to those figured by Seurat ; he does not definitely 

 state that he has examined the Vienna material, although he 

 quotes the same host from both Vienna and Berlin ; it is probable 

 that he examined material only from the latter locality, and that 

 would partly account for the difi"erences between his and my 

 observations ; it is therefore probable that he also is not dealing 

 with Ph. clausa, but with a species identical with or very closely 

 allied to that described by Seurat. Unfortuna,tely Schneider's 

 description is very brief, so that I am not able to make a closer 

 comparison between his and Seurat's accounts. 



fiS* 



