AN^ATOMY OF Tim LOBSTER. 



83 



pace is afterwards scooped out through a large opening or 

 passage on each side of the head, by a membranous ap- 

 pendage of the leg, called the "gill-paddle" {flabdlum. 

 Fig. 99). 



The digestiTe system consists ot a mouth, opening between 

 the mandible^!, an ojsophagus, a large, membranous stom- 

 ach, with very large teeth for crushing the food witliin the 

 large or cardiac portion, while the jiosterior or pyloric end 

 forms a strainer through which the food presses into the 

 long, straight intestine, which ends in the telson. The 



liver is very large, dark 

 green, with two ducts emp- 

 tying on each side into the 

 junction of the stomach 

 with the intestine. 



The nervous system con- 

 sists of a brain situated di- 

 rectly under the base of the 

 rostrum (supraoesopliageal 

 ganglion), from which a 

 pair of optic nerves go to 

 the two eyes, and a pair to 

 each of the four antenna?. 

 The mouth-parts arc sup- 



FiG. 98. — 7), second maxillipede; ea:, exo- ,.,.,, „ ,, 



podite-, end, eiidopodite; flab, epipodite pucd With nerves trom the 

 orflabeiium, or scaptogatimite. iufraffisophageal ganglion, 



which, with the rest of the nervous system, lies in a lower 

 plane than tlie brain. There are behind these two ganglia 

 eleven others; the cephalo-thoracic jiortion of the cord is 

 protected above by a framework of solid processes, which 

 forms, as it were, a "false-bottom" to the cephalo-thorax; 

 this has to be carefully removed before the nervous cord 

 can be laid bare. A sympathetic nerve arises on each 

 side of the oesophagus and distributes branches to the 

 stomach. 



The nerves of special sense are the optic and auditory 

 nerves. The eyes are compound, namely, composed of 



flah 



cxp 



