PLATE 12. 
1-12. Echinonéus cyclostomus Leske. 
1.— Lantern seen from above, measuring 1.30 mm. in diameter. 
2.— The same seen from below. 
3.— The same in profile, height 0.75 mm. 
4.— Pyramid and tooth, seen from exterior, length 0.85 mm. 
5.— The same seen from interior. 
6.— Half of same pyramid, without tooth, seen from exterior. 
7.— The same seen from interior. = 
8.— Pyramid with tooth, same as Figure 4, seen from above. 
9.— Grooved tooth, b. seen in profile, c. dorsal view, length 0.62 mm. 
-10.— The brace; a. seen from above with epiphysis on one side, b. the same from belo 
0.44 mm. j 
11.— Compass; a. seen from above, b. the same in profile, length 0.62 mm. long. 
12.— Epiphysis; a. exterior view, b. interior view, length 0.44 mm. 
All the figures are from a specimen without spines measuring 4.19 mm. 
Port Antonio, Jamaica, H. L. Clark, 
