166 CALIFORNIA ACADEMY OF SCIENCES. 



of which the duct arises. The reservoirs are long and 

 club-shaped, having the ducts passing forward from the 

 anterior ends. He describes also the glands of a 

 Lwmobothriwin as being composed of twenty small tubes 

 situated upon the salivary duct like the teeth of a comb. 



Nitzsch gives several figures showing the salivary 

 glands. In Menopon mesoleucum two pairs of glands 

 are shown of which the inner ones are very long and 

 comparatively narrow. They extend in a straight 

 course backwards along the sides of the alimentary 

 canal as far as the rectal glands. In front they become 

 narrowed and pass gradually into the ducts. External 

 to each of these is a shorter gland. This one is also 

 rather elongated and tapers in front and behind. The 

 posterior end is coiled, while the anterior end passes 

 into the duct. Grosse makes the general statement 

 that the salivary organs consist of a salivary gland and 

 a saliva reservoir, and that the latter are filled with a 

 viscous substance. 



In the Ischnocera the organs have a more definite 

 shape, being much less variable among the different 

 species. They consist of two pairs of glands and their 

 ducts. Each pair lies on one side of the alimentary 

 canal in the region of the anterior end of the crop and 

 is composed of an outer, generally larger gland, and an 

 inner, smaller one (plate xi, fig. 11, 7^ and g). In Tri' 

 chodedes geomydis (plate xi, fig. 1) the two are of about 

 the same size. The inner one (6) has its long axis trans- 

 verse and its larger end turned inwardly; while the 

 outer is oval. The outer organ generally has the appear- 

 ance of being a reservoir rather than a gland. Kramer 

 studied the histology of the two and described the 

 cells of the inner, smaller one as being remarkably 

 distinct, while those of the outer he says are only with 



