20 R. KIRKPATRICK., 
. Spicules. The prineipalia are diactins varying in length and thickness, but 
sometimes very thick and strongly tuberculated at the ends (VII. la). Large regular 
hexactins, with rays spined at the ends, also occur. Among the principalia must be 
reckoned the remarkable pyramidal tetractins (VII. 1b, b') with usually equal rays 
varying in length in different spicules from 320-1000, spined only at the ends. 
Sometimes below the point of junction of the rays there is an enlargement, apparently 
an aborted fifth ray. Some of the hypodermal pentactins resemble the tetractins in 
having their four paratangential rays pyramidal. 
A few anchor-like pentactin pleuralia with straight prongs making an acute angle 
with the shaft are present. 
Only diactins are visible in the few short broken tufts of basalia, but possibly 
some of the spicules with broken ends may be pentactins. 
The autodermalia (VII. c¢.) are thick, closely-spined pentactins with rays each 
169 x 24° 5p. 
The pentactin hypodermalia are found beneath the tubercles and conules ; they 
vary considerably in shape; in some (VII. 1d’) the paratangential rays make an angle 
of 70° to 90°, others (VIL 1d, d’, d*) an angle of 30° to 45° with the shaft; they may 
be wholly smooth, but are usually spined at the ends of the prongs. 
No less than eighteen of these spicules were found beneath the surface of one conule. 
The autogastralia (VII. le) are hexactins with closely spined rays, each ray 
bens Ie s¢ 15° 5p. 
The intermedia. Oxyhexasters (VII. 1f, f', f?) of the three kinds (holo-, hemi- 
and monoxyhexasters) occur, the first and last kind being rare. The diameter is about 
11l5p. The calycocomes (VII. 1g, g!), 230u in diameter, have slender primary rays 
8°34 in length, and the solid capitulam 12m in length and 8°5u in breadth. The 
terminal rays, four to seven in number, are roughened and tipped each with a small disk. 
Each ray has an oval swelling (VII. 1g') near its origin and on the inner aspect, at 
alternately higher and lower levels. Discohexasters are rare. Fic. 1h shows a 
monodiscohexaster 55m in diameter. The axial canals extend only to the end of the 
basal thickened part (primary portion) of each ray. The microdiscohexasters (VIL. 1k) 
are 40m in diameter, the primary rays being 7*5y in length. 
W.Q., June 3, 1903. No. 10 Hole. 238 m. (130 fms.). 
ANAULOSOMA.* 
Rosselline without a central cavity, but with the gastral surface flat and exposed 
at the superior end of the sponge. Without hypodermal pentactins. With oxy- 
hexasters, calyeocomes, discohexasters, and microdiscohexasters. The new genus 
resembles Bolosoma, Caulophacus, and Aulochone in having an exposed gastral surface. 
Among the Rossellinee, Anaulosoma agrees with Aulochone and Aulosoccus in being 
* a, privative ; avAn, hall; c@pa, body. 
