APPENDAGES OF PHVLLOPODA 



27 



excluding the gnathobase) being very mobile and attached to the 

 main stem by a definite joint. On the outer side are two pro- 

 cesses ; a proximal " bract," a flat plate with crenate edges, partly 

 divided by a constriction into two, and a distal process, cylindrical 

 and vascular, called by Sars and others the " epipodite." In 

 other Branchipodidae we have essentially the same condition, 

 except that the fifth endite often becomes much larger than in 

 Artemia, throwing the terminal endite well over to the outer 



t^-...,.^' 



Fig. 8. — A, Thoracic limb of Chirocephalus diaphaniis ; B, prehensile thoracic limb 

 of male Estheria. gn, Gnathobase ; 1-6, the more distal endites. 



edge of the limb ; such a shift as this, continued farther, might 

 well lead to the condition found in the Limnadiidae, or Apodidae, 

 where the lobe which seems to represent the terminal endite of 

 Artemia is entirely on the outer border of the limb, forming 

 what most writers have called the exopodite (Lankester's 

 " flabellum ")} In the two last-named families the basal exite 

 or bract of the Branchipodidae does not appear to be represented. 

 The limbs of tho Apodidae are remarkable in two ways ; 

 those in front of the genital opening (very constantly ten pairs) 



' The nomenclature here adopted is not that of Lankester. 



