PLATE VIII. 



Fig. 27. — Dor.sal view of the digestive organs. Natural size. 



An, dorsal aorta, dividing into innominate and l)uccal arteries. 



B, buccal nia.ss. 



C, C, posterior colunirllar arteries. 

 Coe, coecuni. 



GL, gastric ligament. 



H, hepatic artery. 



I\ first loop of the intestine around the coecum. 



P, posteriorly directed portion of the second loop of the intestine. 



I'\ anteriorlj' directed portion of the second loop of the intestine. 



lA, intestinal artery. 



IL, intestinal ligament. 



L, L, left lobes of the liver. 



L', L', right lobes of the liver. 



Oe, oesophagus (proventriculus). 



PA, anterior proventricnlar artery. 



PN, PN, pallio-nuchal arteries. 



PP, posterior proventricnlar artery. 



8t, stomach. 

 Fic. 28. — Dorsal view of the buccal mass, the buccal nirinbraiu' and cnveloiiing nmscular membrane being cut in the 

 median dorsal line and opened. X 2, 



Ao, aorta, dividing into innominate and l)Uccal arteries. 



BM, buccal membrane. 



(Xt, cerebral ganglion, giving off nerves to the buccal mass. 



DLR, dorsodateral buccal retractor muscles. 



DR, dorsal buccal retractor muscle. 



L.I, tip of lower jaw. 



LJ', posterior portion of the outer tlangc of the lower jaw. 



LM, levator muscle of the buccal nui.'is. 



M, mandibular muscle. 



MM, enveloping muscular mcinbrane. 



N, nerves to the buccal meiidirane. 



Oe, oesophagus. 



UJ, upper jaw. 



X, buccal membrane, passing onto the base of the superior labial lobe. 

 Fid. 29. — The buccal mass turned ui)ward and liackward so as to show its ventral surface and the dorsal surface of 



Van di'r Hoeven's organ. Natural size. 

 Fm. 30. — Side view of the upper jaw. ^■' 2. 



Fh;. 31. — View of the inner surface oi hall of tiie lower jaw, cut in order to show the small inner tlange. X 2. 

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