PLATE 4. 
1-25. Echinonéus cyclostomus LEsKE. 
Outlines of test. 
1.— Actinal side of specimen measuring 37 mm. long. Mauritius. 
2.— Actinal side of specimen measuring 30 mm. long. Mauritius. 
3.— Actinal side of specimen measuring 29 mm. long. Bourbon. 
4.— The same in profile facing the left anterior and the left posterior interrad. 
5.— End view of same, presenting odd anterior ambulacrum. 
6.— Actinal side of specimen measuring 27 mm. long. Pacifie (2). 
7.— Actinal side of specimen measuring 19 mm. long. Pacifie (?). 
8.— Actinal side of specimen measuring 27 mm. long. Makemo Island. Paumotu Islands. 
9.— The same in profile. 
10.— End view of same. 
11.— Actinal side of specimen measuring 17 mm. long. Bourbon. 
12.— Actinal side of specimen measuring 18 mm. long. Kingsmills Island. 
13.— The same in profile. 
14.— End view of same. i 
15.— Actinal side of specimen measuring 13 mm. long. Gilbert Islands. 
16.— The same in profile. 
17.— End view of same. 
18.— Actinal side of specimen measuring 14 mm. long. Gilbert Islands. 
19.— Actinal side of specimen measuring 7 mm. long. Mujeres Island, Yucatan. 
-20.— Actinal side of specimen, measuring 19 mm. long. Pacific (2). 
21.— The same in profile. 
22.— End view of same. 
23.— Actinal side of specimen measuring 17 mm. long. Cuba. 
24.— The same in profile. 
25.— Actinal side of specimen measuring 5.5 mm. long. Mauritius. 
All the profile views show the left anterior and the left posterior interrad. 
The end views show odd anterior ambulacrum. 
The enlargement is about once natural size. 
Figures 8-10, are from alcoholic specimens; the other figures are from dry specimens. 
