Fig. 
on 
Or 
116 
. Portion of the lower surface (x 2), showing the small madreporite in this 
interradius. 
. Lateral view of a portion of an arm (x 4), showing the groups of hooklets. 
. Transverse section of an arm (x4), showing the arm-spines and their 
spicules. 
. A mouth-angle ( x 4), showing the arrangement of the “ papille.” 
PuaTE X. 
Amphiura nore Benham. 
. Portion of the upper surface (x 12, camera), showing the essential cha- 
racters of the species. 
. Portion of the under-surface ( x 12, camera). 
. Aside arm-plate, with spines (not to scale). 
Iuidia sp. 
. Portion of a side of an arm, showing the characteristic alternate arrange- 
ment of the spines. d, the upper, v, the lower, surface. 
. Two successive marginal plates with spines. 
PuatE XI. 
Molpadia dendyi Benham. 
. A group of plates and phosphatic spherules from the middle of the body, 
only a few of which are indicated, though they fill the spaces between 
the plates (x 60, camera). 
. A calcareous plate from the tail region ( x 60, camera). 
. Another plate from the tail (not to scale), showing numerous small per- 
forations in addition to three larger holes. 
Molpadia marenzelleri Théel. 
. Spicules (x60, camera). A portion of an ‘‘ anchor.” is shown at d, 
p p 
and the base of another at 6. The small circles represent the size 
of the phosphatic spherules. At ¢ is one of the sub-anchor plates 
with radiating processes. A young plate is also shown. 
Echinus angulosus Leske. 
. A portion of the test (x1), showing ambulacral and interambulacral 
areas. A is the ambitus; below is one plate for each area (x 2) 
