88 M. O. Strobelt on the Anatomy and 



extend towards the two sides of the thorax. This is its 

 widest part ; it then gradually diminishes, has nearly parallel 

 sides for the greater part of its course, and contracts in a 

 conical form towards the point of entrance of the Malpighian 

 vessels. It is 0'704 millim. long, 0*356 millim. broad at its 

 widest part, 0'274 millim.. in the middle, and 0*107 millim. at 

 the entrance of the Malpighian vessels. As in all Pediculina, 

 its structure is simple. It possesses two membranes. The 

 outer of these {tunica gastri muscular is) , which is clear and 

 structureless, is covered by an extremely fine but regular 

 latticework of delicate muscles. The breadth of these does 

 not exceed 0*0011 millim. ; the individual meshes of the net 

 vary greatly in size, their greatest breadth being 0*028 and 

 their least breadth 0'013 millim. Upon this membrane 

 within is the membrana gastri propria, in which the gland- 

 cells of the stomach are situated. The latter are small oval 

 cells, enclosed by a delicate, clear membrane, and presenting 

 yellow granular contents. Their size varies between 0*010 

 and 0*022 millim. 



The intestinal canal in our animal is of moderate length, 



and describes various y- like bends in its course. The first of 



its two parts, which are separated from each other by a strong 

 dilatation, the small intestine {ileum, fig. 12, i), considerably 

 exceeds the second, the large intestine [colon, fig. 12, a— d) in 

 length, while it yields to it in width. Beyond the above- 

 mentioned dilatation the intestine decreases in width to one 

 half. Throughout its length the intestinal canal allows three 

 membranes to be clearly distinguished. The innermost (mem- 

 brana intima, fig. 12, c) consists of a clear chitinous substance 

 presenting a series of longitudinal fibres or longitudinal layers ; 

 in the middle one [memh*ana media, fig. 12, b) we recognize 

 a number of small closely approximated cells ; lastly, the outer- 

 most [membrana muscularis, fig. 12, a) consists of a great 

 number of strong closely ad pressed muscular bundles. 



Besides these two parts of the intestine, the above-men- 

 tioned dilatation has to be considered. Such a dilatation was 

 noticed by Swammerdam**, as a u Verwijding der Darmen 77 

 in Pedicidus capitis. In the present species it has the form 

 of a funnel, of which the narrow end is turned forward. In 

 this dilatation we distinctly recognize six large oval glandu- 

 lar bodies, with dark granular contents (fig. 12, e). These 

 are 0*084 millim. long and 0*055 millim. broad. They are 

 imbedded in the membrana intima, are separated from each 

 other by grooves, and surround the lumen of the intestinal 



* 16, i. p. 76, tab. ii. fig. 3, 







