34 NOMENCLATURE. 



MULTI VALVES. 



Basis. Base ; in Chiton and Lepas, that part of 

 the shell which is affixed to extraneous 

 bodies, either with or without a Peduncle ; 

 in Pholas, as in Bivalves, the part of the 

 margin opposite to the summit of the beaks. 



Ligamentum. Cartilage; the membrane 

 which connects the valves. 



Limb us. Border; the marginal membrane of 

 Chiton. 



Operculum. Operculum; in Lepas, the lid 

 which closes the vertical aperture, consist- 

 ing usually of four triangular valves. 



Pedunculus. Peduncle; the tubular support 

 of certain Lepades. 



coriaceus. Coriaceous ; like leather. 



Valv;e. Valves. 



dorsales. Dorsal ; the solitary valves in the com- 

 pressed quinquevalve species of Lepas. 



succenturiata. Accessory ; those smaller irregular 

 valves which are annexed to the hinge of 

 the Pholades. 



