MORPHOLOGY OP BATHANELLA AND ALLIED CRUSTACEA. 499 
While Vejdovsky and I had only described a single series 
of thoracic epipodites, Chappuis has made the important 
discovery that Bathynella, like all other living Syncarida, 
possesses a double series of these appendages. The distal 
epipodites are oval vesicles (not flattened, at least in pre- 
Text-fig. 11. 
Bathynella natans, $ . Uropod of right side, dorsal view. 
en. Endopodite. ex. Exopodite. 
served specimens) attached to the proximal segment of the 
limb by a narrow base. Chappuis does not describe them as 
showing any structural differentiation, but ih a cleared 
specimen each is seen to be crossed by a fine suture-line 
about the middle of its length. In the distal half of the 
vesicle the cuticle is slightly thickened, forming a thimble- 
shaped cap, while the proximal part has the cuticle thin and 
flaccid. I formerly described the epipodite as “ borne on a 
