PLATE LX. 



Petalidmm foliacewm (p. 349). 



Fig. 1. Lateral view ; enlarged twice. 



2. Ural apparatus ; d,d, distal joints of the synaphipod of the mandibles ; d', 

 epistoma ; d",d", metastoma ; e,e, first pair of siagnopoda, 



d. Siagon or mandible. 



e. First siagnopod ; detached. 



/! Second siagnopod ; detached. 



g. Third siagnopod ; detached. 



„ 3. Branchiae, shown in position. 



.. 4. A foliaceous branchial plate. 



