380 _ A. A, Julien on Sponge-Spicules. 
tose Of an inch, and whose curvature amount to that of a semi- 
circle. These I take to be rudimentary spicules and suppose 
that they may lose their curvature in their enlargement. 
le 1b 
a E 
2b 
Wi 7 ee SN 
HW 
Kd (fo) 
\\ \ \ CS 
\\ 
Fig. 1, magnified 14 diameters; fig. 2, 250 diameters; fig. 3, 727 diameters. 
under a high power, a series of very fine parallel lines can be 
distinguished on either side of the central tube (fig. 2,2). In 
_ the transverse sections also (fig. 3), a series of very numerous ' 
but usually very faint concentric rings is often revealed, of which 
ce whe nl 
enters the capillary tube 
