COMPARATIVE ANATOMY 



C. Lamellibranchia . 



D. Cephalopoda 



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 67 



V. Arrangement of the Organs in the Mantle Cavity, and 

 OF THE Outlets of Inner Organs in that Cavity 



A. Gastropoda 



B. Scaphopoda 



C. Lamellibranchia . 



D. Cephalopoda 



YI. The Respiratory Organs . 



The True Gills or Ctenidia 



A. Amphineura 



B. Gastropoda 



C. Lamellibranchia 



D. Cephalopoda 

 Adaptive Gills 

 Lungs 



Vn. The Hypobranchial Gland 



VIIL The Head . 



A. Gastropoda 



B. Scaphopoda 



C. Cephalopoda 



IX. The Oral Lobes of the Lamellibranchia 



X. The Foot and the Pedal Glands 



A. Amphineura 



B. Gastropoda 



C. Scaphopoda 



D. Lamellibranchia 



E. Cephalopoda 



XI. Swelling of the Foot (Turgescencc) 



XII. Musculature and Endoskeleton 



A. Amphineura 



B. Gastropoda 



C. Scaphopoda 



D. Lamellibranchia 



E. Cephalopoda 



XIII. The Nervous System 



A. Amphineura 



B. Gastropoda 



