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its posterior extremity. The stomacli varies 

 greatly in its form, both of its main cavity and 

 of the numerous appendages with which it is 

 occasionally furnished. It is termed simple or 

 simplex when it is a mere continuation of the 

 gullet in an enlarged form, being slightly 

 constricted at the union with the gullet, and 

 more so at its junction with the intestines, where 

 an elastic ring is placed, which, when con- 

 tracted, nearly closes the aperture. It is said 

 to be double, or duplex, when it is divided into 

 two distinct portions, one preceding the other. 

 It is triple, or triplex, when it possesses three 

 separate divisions following each other longi- 

 tudinally ; it sometimes, but rarely, has four 

 divisions. It is called compound or compositus, 

 when it throws off two or more minor stomachs, 

 or ccBca, resembling little purses at or near its 

 union with the gullet ; these are particularly 

 observable in the voracious herbivorous insects. 

 (Gr. stomachos, from stoma, a breathing pore.) 



Stomatotheca. — The mouth-case, that portion of 

 the theca encloshig the mandibles and palpi. 

 (Gr. stoma, and theca, a case.) 



Stomodaeum. — The fore-gut, comprising the gullet, 

 crop, and gizzard. (From Gr. stomachos, the 

 gullet.) 



Stomogastric nerves. — Two parallel cords arising 

 from the vagus ganglion, feeding the alimentary 

 canal, on the route to their termination in the 

 mid-intestine. (Gr. stoma, and gaster, the 

 belly.) 



