44 



MR. L. A. BORRADAILE ON THE 



of three epipodites (the epipoclite proper and two " pro-epipo- 

 dites "), as, for instance, in Chirocejihalus (text-fig. 4), is a primitive 

 feature. Beyond the epipodite stood a longer process, the 

 fiabellum, which may have been slender, like those of Ooncho- 

 straca (text-fig. 5) aiad the exopodite of Paranehalia (text-fig, 10), 

 but is perhaps more likely to have been broad, like that of Apus 



Text- figure 15. 



Text-figure 16. 



Text-fissure 17. 



Text-ficfure 18. 



Text-fig. 15. Maxilla of Cerataspis, after Boas. 

 „ 16. Larval maxilla of Penceus, after Claus. 

 „ 17. Maxilla of Anisocaris, after Ortmann. 

 „ 18. Larval maxilla of Falcemonetes, after Boas. 

 For lettering see p. 71. 



(text-fig. 3) and the exopodites of most Leptostraca (text-fig. 8) 

 and of the decapod maxilla (text-figs. 15-18, and 47). It pro- 

 bably extended both distally and proximally from its attachment, 

 like the conchostracan and notostracan flabella and the maxillary 

 expodite of Decapoda. The axis of the limb ended in an apical 

 lobe, and on the inner edge stood a row of endites. It does not 



