494 
W. T. CALMAN. 
many Gammaridea the telson is split almost or quite to the 
base, the two parts are never set wide apart as they are in 
Bathynella. 
Antennule. — The earlier accounts described the an- 
Text-fig. 4. 
Bathynella natans, $. Last somite, telson, and uropod, 
lateral view, en., ex. Endopodite and exopodite of uropod. t. 
One of the telson-plates. 
Text-fig. 5. 
Bathynella natans, $. Telson-plate of right side, dorsal view. 
tennule as uniramous, but Chappuis has discovered that a 
minute vestige of the inner ramus persists. According to his 
interpretation this vestige is attached to the distal end of the 
fifth segment. If this be so, it constitutes a very remarkable 
exception to the rule that the peduncle of the antennule in 
the Eumalacostraca consists of three segments. This rule is 
only infringed, as far as I know, in certain species of 
