1NVEETEBEATA. 



PLATE III. 



DOESAL ASPECT OF THE LOBSTEE. 



(ASTACDS MAEINUS.) 



THE brain is seen giving off the optic nerves, and others to the contiguous parts 

 and the feelers, and sending a long nerve on each side of the oesophagus, which gives 

 filaments to the stomach and joins its fellow at the first ganglion : the nervous cord 

 is then continued from this ganglion to the next, and so on to the tail. The cord 

 exhibits more distinct and continued parallel lines on the dorsal surface than on the 

 ventral. The large artery, supplying the extremities, &c., is seen passing between 

 the two halves of the cord, just above the ganglion giving off the nerves to the 

 last pair of legs. Nerves are seen issuing from the ganglia and the cord, to be 

 distributed to the contiguous parts. In this plate the origins of the nerves of the 

 legs are obscured by others passing over them; but their continuations to the tips 

 of the claws are seen. 



