SYKES : POLYrLACOPHOEA. TKOM POET PHILLIP. 



85 



to trace any use of the Latin termination, or any description by 



Blainville, prior to 1824. Since, in my judgment, Gray's name can 



stand as the author, the emendations of various authors appear to 



be unnecessary. Hermannsen has suggested that the derivation 



is from 7ro\v9, TrXof, and (pe'pw : it appears, however, that (pofjew is 



better than the hist word as tlie origin, since it not only makes the 



: Latinization more accnrate, but also supplies a better meaning. 



' The difficulties which beset those who endeavour to emend original 



I names are illustrated in the Manual of Conchology, by Mr. Pilsbry, 



who, while writing Polyplacophora, 131aiuville, for tlie Order, still 



I uses Plaxiphora, Gray, for a genus. 



' The measurements throughout this paper are taken from specimens 

 ■ which have somewhat contracted and curled in spirit, and an attempt 

 has been made to allow for this. They must therefore be taken as 

 only approximate, as, indeed, must all measurements of length in 

 Ithis group, when not arrived at from living specimens. 



The name " Port Phillip " may convey to some persons the idea of 

 i a small area ; and it may be therefore useful to note that this district 

 ' contains 800 square miles, and is intermediate in size between 

 Oxfordshire and Herefordshire. 



