132 EURETE ERECTUM. 
figs. 10-12). Just below the distal end they measure 4-8 yu in transverse diameter. 
In these measurements the fact finds its expression that the basally thin end-rays 
are distally thickened, whilst the basally stout ones are of uniform thickness 
throughout. The end-rays are destitute of axial threads and usually rather 
densely covered with minute recurved spines, which increase in size from the 
base, where they are about 0.7 » long (Plate 31, fig. 27), to the end, where they are 
1.5-3 uw long (Plate 31, figs. 6-9, 26). The end of the end-ray is thickened to a 
tyle, 12-17 » in transverse diameter. This is particularly conspicuous in the 
end-rays which are thin at the base and thickened distally. The distal, apical 
face of the tyle is dome-shaped and usually quite smooth (Plate 31, figs. 6-9). 
Its sides are densely covered with spines, directed obliquely downwards. The 
spines nearest its apex are small, farther down they rapidly increase in size, and 
the lowest attain 2 1 or more in length. The spines of the tyle are, like those on 
the other parts of the end-ray, distinctly curved downwards. The end-rays are 
curved in an S-shaped manner, strongly, concave to the continuation of the axis 
of the shaft at the base, and slightly in the opposite direction in their distal 
and middle-parts. This second (outward) curvature is sometimes so light that 
the distal part of the end-ray appears straight. The degree of divergence of the 
-end-rays is variable. The bunch formed by them is 60-102 » broad. 
As examples the measurements of three gastral scopules of various dimen- 
sions are tabulated below. 
Total length Me 760 | 920 1180 
Breadth of the bunch of end-rays im 64 | 80 | 62 
length »| —s-642 | 789 1050 
Shaft in the middle bp S25 | 9 | 12 
thickness 
at the base mn 6.5 8 9 
length Be 13 18 | 10 
Centrum | 
thickness mn 12; 15 13 
length Me 105 113 120 
at the base m Bieta) | 5 5 
End-rays HW MOSSEESS | just below the 
2 : 4.5 8 5 
| terminal tyle Le 
transverse diameter of the 15 16 12 
terminal tyle nm 
