1918] 



Alimentary Canal of Altica Larva 



313 



Plate XXIX. 



Fig. 27. Cross-section of colon: the Malpighian vessels have so increased in size 

 as practically to surround the region; both longitudinal and circular 

 muscles are much reduced. 



Fig. 28. Cross-section of the rectum. 



Fig. 29. A portion of the rectal epithelium, typical condition. 



Fig. 30. A portion of the rectal epithelium, in the premolt condition. 



Fig. 31. A portion of the rectal epithelium, just before a molt, the new intima 

 forming. 



Fig. 32. A cross-section through the rectal invagination. 



Fig. 33. A cross-section through theMnvagination of the salivary gland. 



ABBREVIATIONS USED IN THE FIGURES. 



B Basement memlirane. 



BLA.... Bladder. 

 BUG. . .Buccal cavity. 



C^ Primary cuticula. 



C^ Secondary cuticula. 



CM .... Circular muscles 



D Duct of salivary gland. 



E Epithelium. 



FORE.. Fore-intestine. 



H Hypodermis. 



HIND. . Hind-intestine. 



P Primary intima. 



P Secondary intima. 



P Nev,' intima. forming. 



LM Longitudinal muscles. 



M Muscle. 



MID. . .Mid-intestine. 



N Nerve. 



O Oesophageal valve. 



OE Oesophagus. 



P Peritoneum. 



PH A... Pharynx. 



PM Pharyngeal muscle. 



R Imaginal ring. 



RC Replacement cell. 



S Striated border. 



SC Sarcolemma. 



T Malpighian tube. 



