Page:Popular Science Monthly Volume 6.djvu/597

Rh thorax or head breastplate. The large piece of shell, with the seam that covers the back and sides of the cephalo-thorax, is called the carapace or shield (Fig. 15). It is the front sharp point of this shield (carapace) that is called the frontal spine or beak. Behind the head and breast (cephalo-thorax) lies the third division of the body—the



abdomen—which is made up of seven pieces or joints. The first six joints are called somites (Fig. 15) or bodies, and the last joint or tail-piece is called a telson, which means end. So the body of the lobster is made up of six somites and a telson. Each body-piece has a pair of soft-jointed paddles on its under side (Figs. 15, 16), and these are