94 On “Kammplatten” or ‘“Kammleisten.” 
plane slightly elevated above that of the handle, then slightly 
sinks again towards its termination. It is 7 lines long, and 
nearly 2 broad. The variation in the width is slight. The 
edge looking towards the handle is finely pectinated, the teeth 
numbering about sixty. 
Horizon. Low-Main seam, Coal-measures, Northumber- 
land. 
Locality. Newsham. 
Collection of Mr. Taylor. 
No. 2 (Plate VI. fig. 2, twice nat. size).—In shape this 
specimen is not unlike a tadpole. On an interesting slab 
lent me by Mr. Ward there is one of them associated 
with two forms which are referable, I think, to my No. 3. 
The association is probably an accident, and does not point, I . 
think, to any serial affinity. 
Length 8 lines. Handle bent and probably slightly dis- 
torted, longer than the lamella. Lamella 3 tines long; width, 
where greatest, a third of the length. Shape an elongated 
ellipse, marked with about twenty-three irregularly-shaped 
shallow pits or punctures along the middle of the convex area 
in the direction of the length. Teeth about thirty, but not 
easily counted. 
Same horizon, locality, and collection as the last. 
No. 3 (Plate VI. fig. 3, 3 nat. size)—lLength 1 inch. 
Handle nearly straight, slender, and a little longer than the 
lamella. The shape of the latter cannot be well ascertained. 
It lies on its side, with the pectinated edge buried in the 
matrix. It is distinct from the preceding, but is probably part 
of a series similar to that described under No. 4. 
Same horizon, locality, and collection as the preceding. 
No. 4 (Plate VI. fig. 4, nat. size)—Three specimens are 
upon this slab. ‘The smallest may be referable to my No. 2, 
the largest to No. 3. The shape of the third cannot be ascer- 
tained, as it is much broken. The largest plate is 1} inch in 
length, and describes a double curve. ‘The lamella is nearly 
4 lines broad at its widest part, and is fringed on one edge by 
a row of minute teeth, numbering nearly a hundred. By the 
closeness of the pectination it comes near tomy No.1. As 
more abundant material becomes available a gradation between 
the two forms may be established. In the meantime, how- 
ever, it appears best to separate them. 
In the collection of Mr. Ward. Same horizon and locality 
as the preceding. 
