146 Prof. T. R. Jones and Dr. H. Woodward— 
towards the concave side, and their summits are towards the convex 
side. In fig. 44, and in others not figured, the reverse occurs ; and 
M. Barrande could not say if the difference were of generic or only 
of specific value. Possibly the difference may have been due to the 
right or left position of the “tooth ” when in place. Fig. 41 (9 mm. 
long) was found in the same strata with C. inequalis, Barr. Vig. 42 
is 8 mm. long (Woodcut, Fig. 2), and fig. 43 is imperfect ; these were 
found in the strata with C. Bohemica, Barr. Vig. 44 (not quite 
perfect) is 14mm. long. In pl. 18, fig. 2 (15 mm. long) differs 
somewhat from the others; it looks more complicated, but has been 
perhaps decomposed into vertical parallel layers, concentric with the 
chevrons. The specimen in figs. 3 and 4 (30 mm. long) is obscure. 
Fig. 5 (24 mm.) shows four large cusps on one (concave ?) side; and 
six on the other, smaller, and perhaps representing the opposite ends 
of the chevrons. In pl. 31, fig. 21 (22 mm.) shows what appear 
like two nearly perfect rows of blunt cusps. 
Scandinavian specimens.—The “teeth” from Faro, Gothland, 
represented in our Pl. VI. Figs. 9 and 10, and Woodcuts, Figs. 1, 3, 
4, belong apparently to two kinds. Figs. 10 a, b, ¢, are evidently 
related to those with cusps of a chevron-shape when looked at from 
above, and already referred to as described in M. Barrande’s “ Syst. 
Sil. Bohéme.” The chevrons, however, are less sharply angular in 
the flexuous ridges of the northern specimens (Fig. 10 c), and the 
cusps are not only less regular, but are much larger, higher, and 
sharper at one end of the tooth than the other (Figs. 10 a, 6, c). 
Fig. 8 (15 mm. long) shows five cusps of nearly equal size; and 
seen from above they appear to be united by a sharply-angular and 
regular zigzag ridge (Woodcuts, Figs. la, 1b), as in Barrande’s figs. 
41, 42 (Woodcut, Fig. 2), and 44. His figures unfortunately do not 
give the side view for comparison,—only an imperfect vertical 
section, fig. 43. 
3a 
ba Ne) 
2 co, 
Fig. la. Side view of a ‘“‘tooth”; the same as Pl. VI. Fig. 8. From Faro. 
Nat. size. 
1%. The same, seen from the top edge. 
», 2. A somewhat similar ‘tooth,’”? seen from the top. Barrande’s pl. 21, 
fig. 42 a, p. 443. From the Stage E of Bohemia. Nat. size. 
a. Side view of a‘ tooth.”? From Faro. Nat. size. 
6. The other side of the same. 
a 
b 
{\ 
HS 
S 
i 
Side view of a “tooth.” From Faré. Nat. size. 
The other side of the same. 
Pl. VI. Fig. 9 a, b (14 mm. long) presents another shape altogether, 
inasmuch as the cusps keep nearly all in a single row without the 
