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80 Journal of Entomology and Zoology 
lobe of the mantle. From the anterior angle a ventral pallial nerve 
soon branches into two, one for the dorsal lobe of the mantle and 
one for the corresponding adductor muscles. It is probable that 
these nerves also go to the muscles and viscera. In the ventral re- 
gion is a plexus formed by the yentral pallial nerves. In the 
mantle the pallial nerves form a plexus with ganglion cells. 
There are no positive organs of sense; there are neither eyes 
nor otocysts. Probably the margins serve as organs of touch. The 
cirri are probably for tactile sense, possibly olfactory. They have 
a rich nerve plexus. 
Stomach papillae Joubin, 1886-92, suggested as gustatory, and 
the terminal papillae of the mantle Sollas, 1887, believed had a 
tactile function. 
In Ecardia, Delage and Herouard give a separate account. A 
single pair of ganglia are situated very low and at the external 
ia a ice LULL 
5 
Fig. 23. Nervous System of Brachiopoda. A. Diagram of the nervous sys- 
tem from the ventral side showing the ganglion and chief nerves 
after Blochmann. Much modified. B. Diagram of the nervous sys- 
tem of a brachiopod, after Brammelen. C. Position of the nervous 
system shown in position. Diagrammatic. .D. Diagram of Lingula 
showing ganglia in dark. E. General plan of the nervous system. 
F. Plan of the central nervous system. G. Nerve plexus. 
Sa OL A, CT A Ct Mt tata i a ii se 
