760 



PROF. T. H. HUXLEY ON THE CLASSIFICATION [Julie 4, 



Fig. 3. 



XVI XV 



I I 



> I 



I 1 



I 



l+plb ]2ptb 

 I nplhj 



/ 12 arfy / VT IS TrK fl ™\ v ?ep 



\3ydb 



\2-fdb nydb ]0 -pdb 9 P db 



9pdl 



Astacus jluviatilis. 



The branchiostegite, all the podobranchia:, except the epipodite of the first 

 maxillipede, and all the arthrobranchije of the right side are removed ( X 4). 



Fiat. 4. 



13 pi I) 



XVI 



C*»iP>"*, 



XV 



j V - 



/ l2 ,P Ib I 



rplb 



ISpcIo lz6rh / u<irl [ ,oar T9ar^ 



I2pJi> npcib lopdb £>pdb 



7 CD 



\ 8 aro V 



8pab 



Astacopsis franklinii. 



The branchiostegite, all the podobranchise, except that of the first maxillipede, 

 and all the anterior arthrobranchia?, except the first, of the right side are 

 removed ( X 2). 



scff, scaphognathite (not shown in fig. 4) ; 7 ep, the podobranchia of the first 

 maxillipede: 8j)db to l&'pdb, the other podobranchia; ; 8arb to 13 arb, the 

 arthrobranchiae or (heir attachments to the arthrodial membranes of the second 

 and following thoracic appendages; lljalb to I4plb, the pleurobranchiae ; 14, 

 (lie coxopodite of the hindermost ambulatory limb; c.rp, the coxopoditic seta 1 

 of that limb in Astacus. 



