HOMARUS AND NEPHROPS, 259 
fully developed pleurobranchiea. Moreover, the bran- 
chial filaments of these gills are much stiffer and more 
closely set than in most crayfishes. But the most im- 
portant distinction is presented by the podobranchie, in 
which the stem is, as it were, completely split into two 
parts longitudinally (as in fig. 68, B); one half (ep) 
Fia. 68. Podobranchie of A, Parastacus ; B, Nephrops; C, Palemon. 
A’, C’, transverse sections of A and C respectively. a, point of attach- 
ment; al, wing-like expansion of the stem; 6, base; 67, branchial 
filaments ; ep, epipodite ; 2, branchial laminz ; »/, plume’; st, stem. 
corresponding with the lamina of the crayfish gill, and the 
other (pl) with its plume. Hence the base (0) of the 
podobranchia bears the gill in front; while, behind, it 
is continued into a broad epipoditic plate (ep) slightly 
folded upon itself longitudinally but not plaited, as in the 
crayfish. 
The Norway Lobster (Nephrops norvegicus, fig. 69) 
82 
