XXVllI 



NOTES ET REVUE 



Recurved hooks, irregularly destributed in a band which encir- 

 cles the anterior part of llie body, appear in Ph. oulgare at the âge 



Fig. 8 A 



"mu-ytri/. 



neph. 



nv 



mûrir d 



an. 



Fig. 8. 



Fig. 8. — Larva of Ph. vulgare, six weeks old. Fig. 8 a. — Mouth and preoral lobes, 

 viewed from in front, an, anus, oc, eye spot in supra-œsophageal ganglion, 

 neph, nephridium. n. v, ventral nerve cord. 



of six weeks, when the worm is 0.75 mm, in length(Fig. 8); they 

 persist as the characteristic hooks of the adult. No paired latéral 

 awl-shaped bristles, such as Selenka found in Ph. elongatum at 



