CALIFORNIA STALK-EYED CRUSTACEA. 



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different forms. In some cases the outlines of all the 

 regions are very clear, while in others they may be 

 entirely obliterated. Other areas are sometimes given 

 names but they are of little importance. 



P- 



Fig. 2. 'Jarapace of a crab. 3. Mandible of a crayfish. 4. First maxilla. 5. 

 Second maxilla. 6. Third maxilliped. 6, basipodite; 6. r, branchial region; c, coxo- 

 podite; c. g, cervical groove; cp, carpus; c. r, cardiac region; d, dactyl; en, endopodite; 

 ep, epipodite; ex, exopodite; h. r, hepatic region; t, ischium; f. r, intestinal region; 

 M, merus; m. r, mesogastric region: p, palp; p. g, protogastric areas; pr, propodus ; 

 r, rostrum; , urogastric area. 



THE APPENDAGES. 



With the exception of the eyes and the first pair of 

 antennae all of the appendages of a Decapod crustacean 

 may be considered modifications of a common type 



