A NEW TRIBAL NAME 191 



CHAPTER XIII 



TKIBE m. SCYLLAKIDEA 



Thj5 first antenriEe carry two flagella ; the second have no 

 scale. The trunk -legs are six-jointed through coalescence. 

 The first pair are not much larger than the second, and 

 simple or scarcely subchelate ; the three following pairs 

 are simple, and the fifth pair is simple in the male, more 

 or less minutely chelate in the female. The branchiae are 

 well developed ; epipodal plates on the first joint in the 

 first four pairs of trunk-legs have podobranchise attached 

 to them as distinct plumes. All these same limbs have 

 arthrobranchise, and the last four segments of the trunk 

 have pleurobranchise. The first segment of the pleon is 

 without appendages. 



In this tribe Spence Bate says that the ova are very 

 small, and that the young are hatched in a PhyUosoma- 

 form. With the Astacidea and Stenopidea it forms 

 what he calls the normal group of the Trichobranchiate 

 Macrura. It contains two families, the Scyllaridse and 

 Palinuridse, and the tribal name given it by Spence Bate 

 was Synaxidea (see p. 46), derived from a new genus 

 Synaxes, which he considered to combine some of the 

 features of both families. As Synaxes is itself a synonym, 

 it was not possible to retain the tribal name derived from 

 it, while Heller's term loricata adopted by Paulson, Boas, 

 and others, is not in conformity with the names of the 

 neighbouring tribes. 



Family 1. — Scylluridce. 

 The carapace is depressed, with orbits for the eyes 

 excavated in the dorsal surface. The second antennae are 



