3IO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I37 



Gnc 



ICvN- 



5CvN 



59 



MUN Vn ^ IIIDN 



Fig. I. — General view of the ventral musculature and nerve cord of Dissosfcira 

 from the head to the first abdominal segment. (Musculature after Snodgrass.) 



