138 
The American Geologist. 
March, 1896 
cribed than these from the Wenlock limestone, but the termi¬ 
nal structure of the fossil, which, it would seem, must be 
normally retained in specimen 1 h, was not especially deline¬ 
ated. The author expresses the view that the opercular or 
capitular plates are unknown, and is, hence, evidently to be 
understood in this expression as regarding these bodies the 
scale-coated peduncle of the barnacle; a view not altogether 
congruous with the expression just quoted. The fossils which 
were shortly thereafter described by Barrande under the name 
Plumulites* are of similar structure, but none of the figured 
examples are sufficiently complete to afford definite evidence 
of the number of vertical series of plates. Individual plates 
in these specimens are notably more lanceolate or leaf-shaped 
than those composing the Dudley specimens and quite similar 
in this respect to many of the isolated plates described from 
the Devonian of New York. Barrande expressed the view 
that the bodies were composed of not less than four vertical 
rows of plates, and it would seem that PI. bohemicus, as 
represented in fig. 1 (pi. 20), must have had a greater number 
than this, all composed of these leaf-like plates of nearly 
equal size. On the other hand PI. folliculum, represented in 
fig. 17 (pi. 20), appears to have but two rows, both of large 
carinate plates. This author repeatedly refers to the absence 
of the peduncle in his specimens and it is to be inferred that 
he regarded the bodies as capitula. Though neither Wood¬ 
ward nor he is specific in this expression, they evidently dif¬ 
fered somewhat in their conception of these bodies, both agree¬ 
ing, however, that they are barnacles allied to Loricula. The 
allied genus Strobilepis , described by the writer from the 
Hamilton group of New York, consists of four vertical rows 
of plates, two of which are of large size and symmetrical with 
reference to each other; the other two, placed between the 
principal series, are small and accessory, that on the ventral 
side being modified into spines, and the other being composed 
of little plates having the general aspect of the major plates 
but more obtuse and not medially carinate. Strobilepis is a 
barnacle whose plates are large and massively calcareous in 
comparison with Turrilepas , and which terminates in a sub- 
circular patelliform caudal plate having its apex inclined 
*Syst. Sil. Centr. Boheme, vol. 1, suppl., pis. 20, 35: 1872. 
