Ixiv 
SYNOPSIS OF GENERA. 
The structure and exact relations of these bodies still remains open to some 
question. As the separate plates are usually detached and isolated, it is im¬ 
possible to determine how great a variation in form may have existed among 
them in any given species, and, therefore, it may be that some of the plates 
here described as different species on account of their diversity in form, will even¬ 
tually have to be united, as being different parts of animals belonging to the same 
species. By Woodward and Zittel these fossils are regarded as representing the 
scaly peduncle of Lepadoid cirripedes similar to Loricula and Archaiohpas, and by 
Barrande as an elementary type of capitulum. Figures are given by Barrande 
and Woodward which represent the different ranges of plates constituting these 
bodies in approximately their normal position, but in none of them is the 
character of the distal extremity of the scaly covering represented. The type 
specimen of the closely allied genus Strobilepis {S. spinigera) has a single 
conical terminal plate at the distal extremity, and the entire body is probably 
to be regarded as a capitulum, and from analogy it would appear that the view 
of Barrande in regard to the nature of Turrilepas may be correct. 
The term Turrilepas was proposed by Woodward in 1865, the character of the 
fossils being analysed at some length and accompanied by satisfactory illustra¬ 
tion. It has, however, been customary among authors to accord recognition to 
the term Plumulites, given by Barrande in 1872, with somewhat more extended 
description and illustration. There seems, however, to be no valid reason why 
Woodward’s term should not be accorded acceptance. 
The genus Lepidocoleus, Faber, (Journ. Cinti. Soc. Nat. 
Hist., 1886), founded upon a nearly entire specimen of 
the Plumulites Jamesi, Hall and Whitfield, appears to be 
composed of but two ranges of vertical plates of unequal 
size, interlocking along their basal edges for their entire 
length. 
Lepidocoleus Jamesi. 
