MR. R. OWEN ON THE ANATOMY OF THE BRACHIOPODA. 163 
Fig. 11. A magnified view of the superior mantle-lobe injected, with the hearts, 
ovary, digestive and nervous systems. 
12. A highly magnified view of a small portion of the brachial tentacles and stem. 
13. A highly magnified view of a small portion of the edge of the mantle, show- 
ing the terminal divisions of the branchial vessels, and the setose cilia. 
The same letters indicate the same parts in each figure. 
RSee SS (eS ee SoS 
. The mantle-lobe of the flattened or lower valve. 
. The mesial fissure corresponding to the mesial process of the valve. 
. The shell-secreting edge prolonged beyond the roots of the cilia. 
. The mantle-lobe of the convex or upper valve. 
. The fringed margins of the mantle. 
. The long setose cilia. 
. The shorter cilia. 
. The expanded peduncle. 
. The anterior pair of shell-muscles. 
. The posterior pair of shell-muscles. 
. The anterior superior visceral muscles. 
i. The posterior inferior visceral muscles. 
. The fringed brachia, or arms. 
. The transverse basis. 
. The free spiral extremities. 
. The canals in the fleshy basis of the arms. 
. The branchial vessels. These are figured as injected at fig. 11. the 
dark lines n’. being the arteries. 
. The two hearts. (The letters are placed in the orifices of communi- 
cation with the veins of the opposite mantle-lobe.) 
. The arteries going to the liver, ovary, &c. 
. The mouth. 
. The esophagus. 
The stomach. 
. The intestine. 
The anus. 
. The liver. 
The ovary. 
. The subcesophageal ganglia. 
. The filaments from them. 
. The circumscribing aponeurosis of the viscera. 
14. Lingula Audebardii, Brod. 
15. The soft parts of the same species, exposed by the removal of the upper 
VOL. I. 
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