PLATE 11. 
1-10. Echinonéus cyclostomus LESKE. 
1.— Transverse section, showing actinal floor and lantern in position. Test without spines measuring 
3.70 mm. long. 
2.— Lantern in natural position, from same specimen as Figure 1, showing oesophagus, compasses, 
Diameter of actinostome 1.35 mm. and of lantern 1.24 mm. long. 
and various muscles. 
Test without spines 
3.— Oral and part of anal system, showing gills, tentacles, and sphaeridia. 
measuring 4.19 mm. long. 
4.— First spicules round the teeth on the buccal membrane, seen from interior. Same specimen as 
Figures 1, 2, and 3. 
5 — Interior view of actinal system with the rudimentary auricles. 
Specimen without spines measuring 4.19 mm. long. 
6.— Odd anterior ambulacrum, interior view with auricles, enlargement of same specimen as Figure 5. 
7.— Centre of oral system expanded, showing tips of teeth. Test without spines measuring 4.10 mm. 
Diameter of actinostome 1.26 mm. 
long. 
8.— Profile longitudinal section exposing lantern, madreporic tube, and right side of alimentary canal. 
Test without spines measuring 4.25 mm. long. 
9.— Profile longitudinal section, lantern resorbed, with view of oesophagus and right side of ali- 
mentary canal. Test without spines measuring 5.16 mm. long. 
10.— Actinostome interior view, auricles resorbed, length of mouth aperture 1.18 mm, Same specimen 
as Figure 9. 
Port Antonio, Jamaica, H. L. Clark, 
