560 DR. p. E. BEDDARD ON 



suckers. These latter are unarmed and show no peculiarities of 

 moment ; they face outwards and slightly forwards. The hooks 

 of the rostellum are lai'ge and arranged in two I'ows, 17 to each 

 row. Their shape and relative size can be understood from an in- 

 spection of text-figure 91, which represents a longitudinal section 



Text-fig. 90. 



"v,_.: .,/ 





i \ 



Diploptjlidium genettce. 



View of entire worm, magnified. 



J?. Extruded cirri, r. Eostelluni. 



through the retracted rostellum of this species. The rostellum is 

 a muscular one, but with fewer external layers of muscles than is 

 sometimes met with, which act as protractors of the i-ostellar bulb. 

 The stout retractors (see text-fig. 91) are of course continuous 



