108 THE BUTTERFLY VIVARIUM. 



A chrysalis must be carefully examined before 

 all its interest can be fully appreciated. Each 

 delicate line and wrinkle on the nearly even 

 surface of that of a Moth, for instance — marks 

 which appear to the unobservant only so many ac- 

 cidental ridges or indentations — form, in fact, the 

 outlines or immediate encasings of the enclosed 

 members of the Moth itself ; and to each of these 

 features, in the shell of the chrysalis, the late 

 Mr. Kirby assigned a fitting name. 



The only part endowed with any power of motion 

 is the segmental portion which encloses the abdo- 

 men of the insect within. This jointed portion of 

 the chrysalis Mr. Kirby termed the gastrotheca, 

 from the Greek words, gaster, the abdomen or 

 stomach, and theke, a case or receptacle. 



The other extremity, which, with a little ex- 

 amination, will be seen to indicate the forms of 

 the head, of which it is a kind of close horny 

 helmet, was called the cephalotheca, or head-case ; 

 and a portion of this, fitting the eyes, the form of 

 which may be traced in the two raised gobules, was 

 called ophthalmotheca, or eye-case. Passing from 

 beneath the head are two delicately raised ridges, 

 very gracefully curved, which contain the antennae, 

 and have, therefore, received the name, respectively, 

 of ceratheca ; while the main portion, in which 



