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ORDER VII. CYCLOBR ANCH I . 



GENERA. 



1. Patella. (1) Lift. 



Shell of a single piece ; 

 a cord of small branchial 

 leaves under the edges of 

 the mantle ; a thick, short 



trunk. PI. 14. 



fig. 



5,6. 



2 Pointed tcntacula. 



Eyes at the ouler 

 base of the tentacula. 



2. Chiton. (2) Lin. 



A range of testaceous, 

 symmetrical scales along 

 the back of the mantle. 



A membranous veil 

 on the mouth instead of 

 tentacula . 



(1) The mouth is fleshy, and contains a spiny tongue, lengthened posteriorly, 

 and folded deeply within. 



(2) The shell of the Chiton will be figured and described with the Multivalvcs. 



