Bull. U S. F. C. 1895. The American Lobster. (To face page 1 00. i 



Plate D. 



Cut 12.— First left pereiopod of adult lobster, seen from in 

 front, showing anterior border at base, of limb. Two- 

 thirds natural size. 



a, b, constrictions in cuticle of third joint, c, oblique 

 linear impression upon upper surface of second joint 

 X, plane of fracture. 1-5, segments of limb. 



Cut 13. — Basal portion of first left pereiopod of adult lobster from under side. Two- 

 thirds natural size. 



a, b, grooves on surface of third joint external to x. Br, podobranchia. x. plane 

 of fracture, y, spur of second joint. 1-6, segments of appendage. 



Cut 14.— Second left pereiopod of female, 10 inches long, seen from under side. 

 Two-thirds natural side. 



«., constriction upon second joint immediately in front of x. Br, podobran- 

 ehia. x, articulation between second and third joints, corresponding to plane 

 of fracture in cuts 12 and 13. y, spur on second joint. 



Drawn bij F. H. Herrirk. 



