250 



STEUCTURE OF GLANDS. 



nesses in different parts, and tortuous (2) ; in a third it is 

 spirally twisted (3), or is rolled up into a skein simple or 

 double, and with club-shaped ends (4), in every case for the 

 A B C 



E 



H 



Fig. 252. Salivary glands of insects, to show the variety in the form 

 and combination of the secreting follicles, from the simple lobular or 

 filiform canal and blind sac to the greatly complicated raceme. 



A. Part of the salivary gland of Nepa cinerea. After Ramdohr. 



B. Salivary vessel of Asida grisea. After S\iccow,Anat.physiolog. Unters. 



C. Salivary vessel of Musca deviens. After the same. 

 E. The same of Musca carnaria. After the same. 



G. The same of Blaps gigas. After the same. 

 H. The same of Cicada ormi. After the same. 

 M. The same of Pulex irritans. After Ramdohr. 

 N. The same of Scolopendra Afra. After nature. 

 (All these figures, with the exception of that indicated by N, are more 

 or less magnified.) 



