180 



jfirst annual Report 



numbers of the amphipods were infected. It also occasionally 

 occurs on certain other large gammarids found near high-tide 

 mark. 



Pteronyssus bifurcatus n. sp. 



(Figures 97 and 98) 



Integument strongly chitinized ; anterior legs without "thorns." 

 No cuff-like projections on terminal joint of any leg. Male with 

 anal suckers well developed ; first hind leg of male more developed 

 than second. Tarsal sucker larger on this leg than on the others. 

 Abdomen shortly bi-lobate, without leaf-like appendages ; two bristles 

 on each lobe, the medial bristle short, the other one as long as two- 

 thirds the width of the body and arising from a prominent tubercle. 



Figure 98. Pteronyssus bifurcatus 



