Microscopical Essays, bee 



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&M this vifcera feems to have very little relation to the heart of 

 larger animals ; we find no veflel opening into it, to anfwer to 

 the aorta, or vena cava, &c. Sec. 



Near the eighth divifion are two white oblong males, that 

 join the tube of the heart; they have been called reniform 

 bodies, becaufe they are fomething fimilar to a kidney in their 

 fliape. 



The corpus craffum is, with refpecl to volume, the moft con- 

 fiderable part of the whole caterpillar ; it is the firft and only fub- 

 ftance that is feen on opening it, forming a kind of fheath, which 

 envelopes and covers all the entrails, and introducing itfelf into 

 the head, enters all the mufcles of the body, filling the greateft 

 part of the empty fpaces in the caterpillar. It is of a milk-white 

 colour. In it's configuration it is very fimilar to the human 

 brain. 



When the different maffes of the corpus craffum which covers 

 the entrails are removed, the largeft. parts are the oefophagus, the 

 ventricle, and the large interlines. 



The oefophagus defcends from the bottom of the mouth to 

 about the fourth divifion. The anterior part which is in the head 

 is flefhy, narrow, and fixed by different mufcles to the cruftaceous 

 parts thereof; the lower part, which pafies into the body, is 

 wider, and forms a kind of membranaceous bag, which is covered 

 with very fmall mufcles ; near the ftomach it is again narrower, 

 and is as it were bridled by a ftrong nerve, which is fixed to it at 

 diftant intervals. 



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