Introduction to Animal Morphology. 



331 



side a mandible, which, with its fellow of the opposite 

 side, forms the front pair of jaws; each usually 

 bears externally a several-jointed palp, only absent 

 in terrestrial and parasitic forms ; the next segments 

 bear maxillas or hinder jaws, and one or more of the 



Fig- 35- 



Limbs of Pandalus Jeffreysii : — a, a, right and left 2nd pair of pereiopoda ; b, outer 

 antenna ; d, inner antenna ; c, 3rd pereiopod ; e, telson ; f, pleopod ; ff, gnathopod. 



following or thoracic appendages are also specialized 

 for the purpose of chewing. 



The limbs behind this in lower forms consist of a 

 basal process [proto-podite]^ to which is appended an 

 outer [exo-poditc], and an inner {endo-podite) process, 

 the latter sometimes represented by tufts of bristles : 

 in the higher forms the protopodite is lengthened, and 

 divided into parts corresponding to those in the base 

 of the antenna above given, and terminated by two 

 joints representing the ringed end of the antenna 

 {^pro- and dactylo-podite). 



The mouth is ventral, often displaced a little back- 



