﻿INTERNAL ANATOMY OF CORYDALUS CORNL'TUS. 163 



tion. The pyramidal portion of the broad columns has its base anterior ; the apex is pos- 

 terior, compressed laterally, and unattached to the surface of the cavity. Each of the 

 free sides of this portion possesses an oblong space, covered by short and stiff hairs; the 

 sides of the apex are also furnished with hairs, which are two or three times longer than 

 the others. The flat portion of these columns is a muscular basis for the attachment of 

 stomachal teeth. These teeth are composed of a hard, corneous substance, are broad and 

 concave posteriorly, projecting in a pointed process at the anterior part of the concavity, 

 and elongated forwards into a manubrium. The three alternate of these bodies are 

 rather narrower than the others. The six intermediate columns are narrow and coch- 

 leariform, and only extend the length of the pyramidal portion of the broad columns. 

 The columns, as well as the intermediate spaces, are covered by a moderately thick 

 epithelium. The posterior tubular portion of the proventriculus presents a number of 

 longitudinal folds internally, and opens into the ventriculus. 



The ventriculus is a quadrilateral receptacle, apparently formed by the apposition of 

 four cylinders which anteriorly diverge slightly, and form as many coecal pouches lying 

 along the posterior proventriculus. The walls of this cavity are thin, and the internal 

 surface is smooth. It contained a fluid matter of a whitish, granular appearance. 



At the commencement of the fifth abdominal segment the ventriculus opens into the 

 large intestine. The latter is separated from the former by a contraction, at which point 

 the biliary tubes open. Commencing somewhat dilated, the large intestine then con- 

 tracts, and forms a short convolution forward, then gradually dilates, and proceeds 

 towards the anus, before reaching which it becomes gradually contracted again. The 

 large intestine is thin, corrugated, and dilatable. Salivary glands do not exist. 



The biliary tubes are eight in number, long, convoluted, and closely applied to the 

 sides of the large intestine. They open at the contraction separating the ventriculus 

 from the large intestine. 



2. In the Pupa. — The oesophagus is narrower than in the larva, is cylindrical, and 

 pretty uniform, and extends backwards as far as the commencement of the metathorax, 

 where it opens into what corresponds to the ventriculus of the larva. It does not present 

 the internal folded appearance of the larva, and the apparatus of the proventriculus of 

 the latter has entirely disappeared in this stage ; but as a substitute, we find a crop within 

 the metathorax opening into one side of the oesophagus. This crop resembles the suck- 

 ing stomach of many Lepidoptera, is simple, and lies folded upon the oesophagus. It 

 was usually found empty. 



The ventriculus is capacious, and extends from the termination of the oesophagus 

 nearly to the posterior part of the third abdominal segment. It is of an elongated ovate 



