116 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



On the sixty-fifth day the lobster moulted and the regenerated 

 limb now assumed the proportions shown in figure 15. 



h. Morphological Characteristics. Figs. 15-18. 



Beginning with the distal extremity of the normal leg, it may be 

 readily seen that the dactyl (D) and propodite (PR) are normal in 

 form, have the usual distribution of hairs and serrated teeth upon 

 the jaws formed by the dactyl and index, and the claw itself opens 

 upward in the normal dorso-ventral plane. The third segment or 

 carpopodite (c) is relatively very broad, and massive, with its distal 

 region split into two unequal forks. The larger of these two forks 

 represents the normal segment, while the smaller abnormal one (c') 

 shunts off from the lower surface (slightly posterior of ventral) of 

 the carpopodite at an angle of about 45 degrees. The last two 

 proximal segments are abnormally thick and massive. One notice- 

 able feature in the meropodite (m) is a variation in the form of the 

 V-shaped groove on the distal ventral surface, into which the third 

 segment plays when in motion. Normally, this groove is single, but 

 in the present specimen there are two grooves, as shown in figure 16, 

 g, g'. One of these grooves (g') is considerably larger than the 

 other, but it is difficult to determine from the external form which 

 one represents the normal structure. The last proximal segment (IS), 

 aside from its relatively great size, shows two unusual markings: 

 the one is a triangular-like scar (s), which may possibly be the result 

 of a previous injury, although I observed nothing of the sort before 

 the moult occurred; the other marking is a slight groove (g") at 

 right angles to the scar just described. This slight groove on the 

 ischropodite, together with the double groove on the meropodite 

 (Fig. 16, g, g'), indicate that these segments may be morphologically 

 doubled by the proximal extension of the abnormal process on the 

 carpopodite (c). 



Turning our attention now to the abnormal branch of the carpop- 

 odite, it may be observed that it tapers rapidly distally, to relatively 



