84 Lessons in Zoology. 



saddle on its back like the lobster. It has one pair of 

 antennee. It has two large eyes. It has a head>thorax 

 and an abdomen. 



Is there any movable joint between the lobster's head 

 and its thorax ? 



No ; the head-thorax is all in one piece. 



If there is a joint between the grasshopper's head and 

 its thorax, which bears the legs, then we will say it has a 

 head and a thorax. Has the grasshopper a head-thorax 

 or a head and a thorax ? 



It has a head and a thorax. 



What are the three parts of the grasshopper's body ? 



The head, the thorax, and the abdomen (Fig. 1, 

 A, B, C). 



We observe next that the grasshopper has jointed ap- 

 pendages, that its skeleton is a horny crust on the outside 

 of the body, and that it can be divided into two equal 

 parts by a cut lengthwise from the head to the end of the 

 abdomen. We stop a moment to recall other animals 

 that we have studied whose bodies can be divided in 

 halves in the same way. 



An extremely careful CQuat shows us that the abdo- 

 men consists of ten rings. The only appendages of the 

 abdomen are three pairs of hooks, or " egg-points," at 

 the end, forming the egg-layer. A large oval spot on the 

 first ring (Fig. 1, ea,) is the ear, one on each side. We 

 think this a curious place for the ears, but remember 

 that the lobster carries its ears in its small antennae. 



The first ring of the abdomeD (Fig. 1, c^,) can be seen only on 

 the back, as it doea not reach whoU; aroand the body, while in the 

 male the ninth and tenth (Fig. 1, P, k^,) are mnch larger on the 

 nnder side. It ia often said that the ovipaaitor consists of bat twu 

 pairs of organs (Fig. 2, os^ and oa^,), probably becanae the third 

 pair (Fig. 2, 05°,) are very small and not readily seen nnlesa 

 the parts are distended. Neither are natoralisCa agreed as to the 



