REPORT OF COMMISSIONERS OF INLAND FISHERIES. 65 



occurring in varying localities of the body and appendages. This 

 typical brown may, and usually does, have many modifications 

 among which the most prominent are red-brown, maroon, and brown 

 and green. The light spottings may occur in the following localities : 

 tips of chelae, of maxillipeds, of telson, of rostrum, of pleura, and tips 

 of the exopodites of the last pair of abdominal appendages; or they 

 may exist as body spots. In case of the last, the position is usually 

 on the anterior and lateral region of the carapace, where they mark 

 certain attachmicnts of the gastric or mandibular muscles, or they 

 may form large light patches over the heart or gastric region of the 

 carapace. The spots may occur in any or all of these positions at 

 once, but the most constant are the claw tips, body spots, and those 

 on the first abdominal segment and on the telson. 



It may here he noted that the transparency of the body often so 

 evident in the larval stages, wherein many of the internal organs such 

 as the green gland and vesicle, stomach, intestine, heart, liver, gills, 

 etc., could be demonstrated more or less distinctly, and which has 

 to a great extent been lost in the fourth larval stage, has in the fifth 

 stage disappeared to a still greater degree, so that it is with difficulty 

 that the position of the above mentioned organs in the body cavity 

 can be discerned; hence, in this and the later stages the color vari- 

 ations are due to the cuticular and epithelial pigmentation alone, 

 or to changes in the pigment of the exoskeleton. I am informed by 

 Mr. E. W. Barnes, whose observations upon the color variations in 

 the ninth and eleventh stages have materially helped in producing 

 data, that he came upon a lobster which, soon after moulting into 

 the tenth stage, manifested a remarkable transparency in all parts, 

 so that the action of the heart and position of the gills could be plainly 

 observed through the carapace, which was of a bluish color. 



Sixth Stage. 



The color of the sixth stage lobster resembles very closely that 

 of the fifth stage. Indeed, by examining the colorations it is almost 

 impossible to tell the two stages from one another by this method. 



