PLATE 28. 
1-24. Echinonéus cyclostomus LESKE. 
1— Actinal tube-foot 0.65 mm. long, seen in profile, from near actinostome in odd anterior ambulacrum. 
2 — Actinal tube-foot, seen from above the disk, from right anterior ambulacrum. 
3.— Profile of an actinal tube-foot, from odd anterior ambulacrum. 
4.— Disk plates 0.7 mm. in diameter, seen from above, near actinostome, in odd anterior ambulacrum. 
5.— One of the disk plates, whole disk 0.22 mm. in diameter, from right anterior ambulacrum, actinal 
side. 
6.— Disk plates 0.14 mm. in diameter, seen from above, from odd anterior ambulacrum, towards 
apical system. 
Figures 1-3, 5 and 6, are from a test with spines measuring 25 mm. long. Figure 4 from a test 
with spines measuring 7 mm. long. Port Antonio, Jamaica. 
7.— One of the disk plates, seen from below with yoke-shaped spicules, whole disk 0.22 mm. in diameter, 
from odd anterior ambulacrum actinal side, test with spines measuring 30 mm. long. 
Barbados (?). 
8.— One of the disk plates, from tube-foot near actinostome, left anterior ambulacrum, test with spines 
measuring 30 mm. long. Barbados (?). 
9.— One of the disk plates from tube-foot near actinostome, left anterior ambulacrum, test with spines 
measuring 26 mm. long. Barbados (?). 
10.— Abactinal tube-foot 0.22 mm. long, seen in profile, from near ocular plate, odd anterior ambulacrum, 
test with spines measuring 12 mm. long. Makemo Island, Paumotu Islands. 
11.— Disk plates 0.15 mm. in diameter, seen from above, actinal side, odd anterior ambulacrum, test 
with spines measuring 12 mm. long. Makemo Island. = 
12.— One of the disk plates, whole disk 0.20 mm. in diameter, from odd anterior ambulacrum, actinal 
side, test with spines measuring 18 mm. long. Makemo Island. 
13.— Disk plates 0.10 mm. in diameter, seen from above, near the ocular plate, in odd anterior ambula- 
crum, test with spines measuring 12 mm. long. Makemo Island. 
14.— One of the disk plates, whole disk 0.19 mm. in diameter, from odd anterior ambulacrum, actinal 
side, test with spines measuring 23 mm. long. Fakarava Island, Paumotu Islands. 
15.— Peripodium at the edge of actinostome. : 
16.— Fifth peripodium from actinostome. 
17.— Peripodium at the ambitus. 
18.— Peripodium near ocular plate. 
Figures 15-18, odd anterior ambulacrum, test with spines measuring 34mm. long. Lord Howe Island. 
19.— First and second peripodia at the edge of actinostome, odd anterior ambulacrum, test with spines, 
measuring 37 mm. long. Mauritius. 
20.— Fifth peripodium from actinostome, same specimen as Figure 19. 
21.— Peripodium at the edge of actinostome, odd anterior ambulacrum, test without spines measuring 
27 mm. long. Pacifie (?). 
22.— Fifth peripodium from actinostome, same specimen as Figure 21. 
23.— Fifth peripodium from actinostome, odd anterior ambulacrum, test with spines measuring 27 mm. 
long. Makemo Island. 
24.— Fifth peripodium from actinostome, odd anterior ambulacrum, test with spines measuring 26 mm. 
long. Jamaica. 
The enlargement of all the figures is not identical. 
