330 



BUI^LETIN OF THE BUREAU OF FISHERIES. 



organs of the schizopods, have given to this and the two succeeding larvae the name 

 of the "schizopod" or "mysis stage." Functional appendages are wanting only in the 

 abdominal segments, where, however, very small buds of the adult swimmerets can be 

 seen beneath the cuticle in the second, third, fourth, and fifth abdominal somites. 



The cuticle of the larval lobster is now as translucent as glass, and such organs as 

 the heart and blood vessels, the alimentary tract, and the rudimentary gills are seen with 



h 



Fig, 35. — Cephalothorax o( lobster in first stage when under stimulus of pressure, drawn immediately 



after reddening, through expansion of chromatophores. a, b. Lateral and dorsal red chromatophore 



groups; yellow pigment not here shown. 

 Fig. 36. — Cephalothorax of the same individual 10 minutes after release from pressure, and after paling 



from contraction of chromatophores. Both the red (sohd) and yellow (dotted) pigment cells are 



indicated. 



great clearness. The green food yolk has disappeared entirely or is reduced to a mere 

 remnant now more yellow than green, in the masticatory stomach. Perhaps the most 

 conspicuous internal organ is the yellowish-brown "liver/* or gastric glands, the form of 

 which on either side of the body resembles a cluster of grapes. 



