274 Dr. H. Woodward—Turrilepas in Canada. 
Turrilepas, on the ground that the latter was never characterized ; 
but my previous remarks equally apply in this case.’ (Nicholson 
and Htheridge, Girvan District, p. 214.) 
In Messrs. James Hall and John M. Clarke’s Geological Survey of 
the State of New York, Paleontology, Albany, N.Y. 1888 (4to. pp. 
215-220, pl. xxxvi. figs. 1-19), the authors give figures and descrip- 
tions of eight species of Turrilepas from the Upper Helderberg and 
Hamilton groups= Devonian, Ontario and Ohio. One or two of these 
plates resemble somewhat Barrande’s Bohemian species and also 
plates figured by the writer from the Wenlock Shale, Dudley, but they 
are apparently all specifically distinct from the European forms, but 
with the same persistent ornamentation in which they all agree.’ 
The discovery by Mr. Ami of a new specimen of Turrilepas in so 
low an horizon as the Utica series, equivalent to our Llandeilo Flags, 
is particularly interesting, as the species recorded by Messrs. Hall 
and Clarke in Ontario are all from the much later Devonian formation. 
Turrilepas Canadensis, sp. nov., discovered by Mr. Ami in the Lower Utica series = 
Llandeilo, right bank of the Rideau River, Rifle Range, near Ottawa, Canada. 
Description of the Ottawa specimen :— 
Valve roughly triangular, right-hand border very broadly-rounded, 
but contracting inwards towards the apex; lower border sinuous in 
outline ; left-hand margin nearly straight, curving slightly towards 
the apex, which is deflected a little towards the right side ; the strie, 
which are slightly raised, are about 30 in number, very delicate 
and regular, and all follow the undulations of the lower border ; 
ihe carina dividing the right and left sides of the valve is very much 
nearer to the left-hand margin, with which it is also parallel nearly 
to the apex, the left side being only about one-third as wide as the 
right side; at about a third of the distance between the carina and 
the right-hand border of the valve and parallel to the carina is 
another apparent ridge (marked in the woodcut by a line of shading) ; 
this is really a flexure in the lines of growth and ornamentation, 
which is further emphasized by a fracture in the matrix containing 
the specimen exactly on this line. 
The valve of Turrilepas Canadensis measures six millimetres in 
height and five millimetres in breadth. 
In general form the Ottawa specimen agrees somewhat closely with 
1 This ornamentation, as I have pointed out (see Grot. Mac. 1880, Dec. II, 
Vol. VII. p. 197) occurs also on the body-plates of the anomalous Cystidean, 
Ateleocystites, which is found in the same Wenlock Limestone of Dudley, and in 
the Trenton Limestone of Ottawa. 
