56 TROPICAL PACIFIC ECHINI. 
One might regard this as a specific character for the West Indian species, 
but it is not characteristic of those from Jamaica. Two valves, A and B (PI. 23, 
figs. 3, 4), from the odd posterior interambulacrum, near the anal system, in a 
young specimen 4 mm. long, from Port Antonio, resemble those of a typical 
ophicephalous pedicellaria. : 
The globiferous pedicellariae were found only near the ambitus, and on the 
abactinal system in the two specimens from Lord Howe Island, and in a small 
specimen from Fakarava Island; besides these there were some near the summit 
in the two individuals from Barbados, and in the specimens from Jamaica. 
These pedicellariae (Pl. 22, figs. 1-16, Pl. 23, figs. 5-8), are essentially alike in 
the different specimens, although they vary more or less in outline. 
In three valves of the same pedicellaria, from the left anterior ambulacrum, 
on the actinal side toward the ambitus, the pointed blade is nearly as long 
as the base (Pl. 22, figs. 3-6), with twelve strong lateral teeth on each blade, 
except C, which has only eleven. In other valves examined, the number of the 
lateral teeth in A and B, vary from nine in the smallest to thirteen in the 
largest, valve C generally having one less. From the right posterior interam- 
bulacrum, at the ambitus, in valves A and C (figs. 8, 9), height 0.26 mm., 
the blades are round at their upper ends, and about one third the length of 
the base, while in two other valves B and C, 0.34 mm. in height (figs. 10, 11), 
from towards the apical system, the blades are longer, and the bases broader 
at the articulation surface. Another (fig: 12), valve B, height 0.32 mm. from 
near one of the genital plates, has assumed the form of those on the actinal 
side. All these pedicellariae came from the same specimen, 34 mm. long, from 
Lord Howe Island, N. 8. Wales. 
When the distance between the localities, and the difference in length of 
the two specimens (one 34 mm. from N. 8. Wales; the other 19 mm. long, from 
Fakarava Island) is considered, it is singular that the pedicellariae do not appar- 
ently show any real differences (see figs. 13, 14, two valves, A and B, from the 
right posterior interambulacrum of the latter). Attention should be called to 
the slenderness of the valves (Pl. 22, figs. 15, 16), in a specimen 30 mm. long, 
from Barbados, when compared with a valve of a 4 mm. specimen from Jamaica, 
(Pl. 23, fig. 5); in the latter it is nearly triangular, with a minute blade and 
rounded base. This difference might be considered important if another valve 
(Pl. 23, fig. 6), from the same part of the ambitus and from the same Jamaican 
specimen was not shaped like those from Lord Howe Island and if it was not 
also unlike two valves (figs. 7, 8), in a specimen 5 mm. long, from Jamaica. 
