r 



NO. 3 



INSECT HEAD — SNODGRASS 



149 



r-; [ 'j~>-^r'/V- 



mm 



m^ A 



Blli 



m 



^mmM 1: 



B 



m 



lllllll'H 



iiiilifii 



E 



c 



,.»;V^fr'?S'(?''i^'«-j 



Cr 



^^: 



.c 





Pvent lilit^gEl^-- 

 vent ;U§f lip f,^ p 



^' '-• -mi J f l^ 1 ^f 



Fig. 56. — Muscles of the stomodeum of a noctuid caterpillar. 



A, B, origin of longitudinal muscles (in), of crop (see fig. 55) from fibrils 

 deflected from the anterior circular muscles (/, k). C, plexus of longitudinal 

 muscles, anterior part of crop. D, piece of circular fiber from anterior part 

 of crop. E, a connecting fiber between circular and longitudinal muscles. F, 

 posterior end of crop (Cr), proventriculus (Pvcnt), and anterior end of ven- 

 triculus (Vent): I, m, circular and longitudinal muscles of crop; n, circular 

 muscles of proventriculus ; o, external longitudinal fibers of proventriculus ; p, 

 first suspensory muscles of ventriculus. G, parts of seven consecutive circular 

 fibers of proventriculus, showing bundles of uniting fibrils, external. 



