70 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 92 



201. Musculus dilatator anterior inferior ventriculi. One pair. — 

 The muscles of this pair are extremely attenuate and difficult to sepa- 

 rate from the antero-superior dilator muscle of the foregut {206) at 

 their common origin on the upper part of the epistome. A careful 

 tracing shows that the former pair is inserted on the lower anterior 

 wall of the ventriculus above and behind the termination of the esopha- 



202 211a 211b 211c 211d 211e 210a 199b 198 



199a 



215 208 209 205b 205a 216m 216j 2161 21Gf2l6h216g- 



Fig. 30. — Lateral view showing muscles of the stomach. 



jgy, musculus gastricus anterior ; 198, musculus gastricus posterior mesalis ; 

 ipga and b, musculus gastricus posterior lateralis a and b; 200, musculus dilatator 

 anterior superior ventriculi ; 201, musculus dilatator anterior inferior ventriculi : 

 202, musculus dilatator lateralis anterior ventriculi ; 203, musculus dilatator 

 lateralis posterior ventriculi ; 204a and b, musculus dilatator dorsalis pylorici 

 anterior a and b; 205a and b, musculus dilatator pylorici inferior a and b; 

 206, musculus dilatator anterior superior oesophagei ; 207, musculus dilatator 

 anterior inferior oesophagei ; 208, musculus dilatator lateralis oesophagei ; 2og, 

 musculus dilatator posterior oesophagei ; 210a, musculus cardiopylorici a; 

 2iia-g, musculi interiores cardiaci laterales a-g ; 215, musculi circumoesophagei ; 

 2i6a-n, musculi pylorici a-n. 



gus. The connectives of the cerebral ganglion pass diagonally across 

 them. (Fig. 30.) 



202. Musculus dilatator lateralis anterior ventriculi. One pair. — 

 These muscles arise on the roof of the prebranchial chamber and pass 

 inward and downward to their insertion on the upper margin of the 

 anterolateral cardiac plate {Cd Al). They are not very firmly knit and 

 may be torn away with the tissues surrounding the stoinach. (Fig. 30.) 



20^. Musculus dilatator lateralis posterior ventriculi. One pair. — 

 Arising on the roof of the prebranchial chamber, these muscles pass 



