47-1 Mr. L. A. Borrutlalle on the 



always clearly in size and position and 

 nearly always in size and shape fvom the 

 third pair. Abdomen anomiirous (reduced 

 in some of its features, but shoAvinp: clear 

 traces of some function other than that of 

 reproduction, and almost always carrying 

 biramous limbs on the sixth segment) or, 

 rarely, macrurous. A movable autennal 

 scale often present. Third maxillipeds 



usually narrow ANOM URA. 



2. Carapace fused with epistome at sides and 

 nearly always also in middle. Last tho- 

 racic sternum fused with rest, its legs 

 often like the others. Abdomen brachy- 

 urous (small, straight, symmetrical, bent 

 under the thorax, showing no traces of 

 other function than reproduction, and 

 without biramous limbs on the sixth seg- 

 ment). Never a movable antennal scale. 

 Third maxillipeds broad BRA CHYURA . 



Key to the Superfamilies of the Palinura. 



I. Carapace gripped by the first abdominal 

 segment alone. First joint of second an- 

 tennae not fused with epistome ; a scale 

 present on this limb. All the legs, except 

 sometimes the last pair, chelate ; the first 

 larger than the rest. Unbranched limbs on 

 the first abdominal segment. Tail-fin not 

 softer behind than before, without sutures. 



Telson pointed Eryonidea. 



II. Carapace gripped between a lobe on the first 

 abdominal segment and a knob on the side 

 of the last thoracic, first joint of second 

 antennae fused with epistome ; no scale on 

 this limb. None of the legs much longer 

 than the rest, or, except sometimes the first 

 pair, chelate. No limbs on fir.'-t abdominal 

 segment. Tail-fin divided by indistinct 

 sutures into a soft hinder half and a harder 

 front half. Telson roughly square behind. . Scyllartdka. 



Key to the Families of the Scyllaridea. 



I. Cephalothorax subeylindrical. Eyes not en- 

 closed in separate orbits formed by the edge 

 of the carapace. Second antennae with 



flagella Palinuridae. 



IT. Cephalothorax depressed. Eyes enclosed in 

 separate orbits formed by the edge of the 

 carapace. Second antennfe with flat scales 

 in place of the flagella Scyllaridae. 



