112 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



This second is at the present date (January 30, 1907) still in a healthy 

 condition. 



4. Similar Claws on hath Sides of the Body. 



Specimen No. 6. Figs. 6-9. 



Besides the deformities consisting of various divisions and repe- 

 titions of a given limb, there is another category of abnormalities 

 occasionally met with, which consists of similar chelae developed 

 on both sides of the body. 



During the summer of 1905, among the lobsters caught inthetfaps 

 near the experiment station, I found an adult specimen with two 

 similar claws. The lobster was a male and measured 8J inches in 

 length. 



Figures 6 and 7 represent the original chelse of this lobster. The 

 right limb (Fig. 7) is slightly larger than the left, but otherwise they 

 are very similar in character. Both claws are rather elongated and 

 slender in form. The joints between the dactyl and index is placed 

 well down toward the proximal region of the propodite. Tactile 

 hairs are in a dense fringe along the dentate margins of each jaw. 

 The narrow pointed teeth in each jaw are included in linear series, 

 except a stout displaced tooth about midway in dentition of each 

 index, which forms the "lock" to the claw. These two claws, there- 

 fore, are not only similar in practically every respect, but they are 

 also of the "nipper" type of chelae. 



The following experimental data were also obtained : Soon after 

 the lobster was taken from the traps, an operation was performed 

 in which both chelipeds were autotomously removed on July 14, 

 1905. Soon after the amputation of these limbs another pair of 

 chelse began to regenerate from the remaining stumps or basipodites. 

 The following observations were made: 



