134 ANATOMY AND PHYSIOLOGY 



adhering to the more simple division and nomenc 

 tare indicated on a former page. It will he seen 

 moreover, that two of the parts which we have no 

 regarded as entitled to a separate consideration, the 

 duodenum and the colon, are thought to exist in only 

 a very few species, and even then they are not par 

 ticplarised hy any one constant character. 



The intestine commences immediately hehind th 

 chylific ventricle, from which it is separated hy an 

 annular constriction or sphincter. This alone points 

 out its origin, when the biliary vessels are placed 

 towards the aims ; but being usually inserted imme- 

 diately beneath the sphincter in question, they then 

 mark precisely its anterior limit.* The small intes- 

 tine, in its ordinary state, is a slender simple tube, 

 very variable in length. In general, it is a good deal 

 shorter than the body, frequently shorter than the 

 chylific ventricle, (as in the Chrysomelidce?) some- 

 times it attains the length of the body, and in a few 

 instances exceeds it. In certain cases it deviates 

 from a simple tubular form, and becomes inflated 

 more or less* abruptly into a clavate or oval-shaped 

 bag. This is well exemplified in the common cock- 

 chafer, (Plate II. fig. 3 f 3 ) where it forms a large 

 ovo : .d pouch, and presents, when distended, five pro- 

 jecting ribs, which correspond to a series of im- 

 bricated plates in the interior. In this case there is 

 an additional inflation, of much smaller size, a little 

 behind the principal one. " If the name of this por- 



* Lacord. Intro. IL 33. 



