2<)6 



THE AMERICAN NATURALIST [Vol. XLIV 



doubt, the original " stalk" or bond of union with the 

 rest of the shell. Close to this base rises a crest one 

 third of an inch long (seen to left of star in Fig. 3), 

 and from this a rather conspicuous furrow diverges and 

 passes diagonally up one side of the mass. In this 

 furrow close to what we regard as the base of attach- 

 ment, lies a large hair-pore (over star), which is visible 

 to the eye, and into which a needle-point can be easily 

 thrust, while around this base a dozen smaller but quite 

 similar hair-pores can be readily detected with a 

 magnifying glass. 



The punctuate or granulated surface of the body 

 (Figs. 2 and 3) is seen upon microscopical examination 

 to be due to minute elevations, which are thickly and 

 rather uniformily distributed. Each of these elevations 

 is crater-like, having what appears like a central pore, 

 from which radiate very fine creases or striae. 



The shell of the lobster, although apparently a solid 

 armor, is very sensitive, for it is virtually a strainer, 

 being penetrated in its every part with multitude 



