PLATE 10. 
1-10. Echinonéus cyclostomus LEskKe. 
1.— Alimentary canal, madreporic tube, and reproductive organs, seen from right side, with both 
sides of test removed. Specimen with spines measured 22 mm. long. 
2.— The same seen from left side. 
3.— Actinal part of intestine, actinal intestinal appendage, oesophagus, and madreporic tube removed 
from test, which without spines measured 4.19 mm. long. 
4.— Longitudinal section of anterior end of test, showing appendage of alimentary canal, oesophagus, 
and madreporic tube, held in place by mesenteries. Test with spines measured 22 mm. long. 
5.— Profile of oesophagus, madreporie tube, and genital ducts, showing folding of edge of mesentery. 
Specimen with spines measured 21 mm. long. 
6.— Axial organ with mesentery laid back, showing nerve along outside edge. Same individual as 
Figure 5. : 
7.— Oral system with surrounding coronal plates, seen from interior, with pentagonal and radial 
nerves, and water-vascular canals, showing oesophagus fastened to inner margin of pentagon. 
Dissected to show mouth in centre of buccal membrane. Test without spines measured 21 mm. 
long. 7 
8.— Nerve with radial canal, and two ampullae, from odd anterior ambulacrum, actinal side, midway 
actinal system, and ambitus. Test without spines measuring 21 mm. long. 
9.— Mesentery and outside edge of intestine, showing surface folds. Test without spines measuring 
21 mm. long. 
10.— Outside edge of abactinal alimentary canal with mesentery. Test with spines measuring 22 mm. 
long. 
Port Antonio, Jamaica, H. L. Clark. 
