20 R. KIRKPATRICK. 



SpiculeS. The principalia 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. ib, b 1 ) with usually equal rays 

 varying in length in different spicules from 320-1 000/A, 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 

 169x24'5/t. 



The pentactin hypodermalia are found beneath the tubercles and conules ; they 

 vary considerably in shape ; in some (VII. Id 1 ) the paratangential rays make an angle 

 of 70 to 90, others (VII. Id, d 2 , d 3 ) 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 

 being 118 x 15'5/t. 



The intermedia. Oxyhexasters (VII. If, f 1 , f 2 ) of the three kinds (holo-, hemi- 

 and monoxyhexasters) occur, the first and last kind being rare. The diameter is about 

 115/*. The calycocomes (VII. Ig, g 1 ), 230/A in diameter, have slender primary rays 

 8'3ju,in length, and the solid capitulum 12/x, in length and 8'5/t 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. Ig 1 ) near its origin and on the inner aspect, at 

 alternately higher and lower levels. Discohexasters are rare. Fig. Ih shows a 

 monodiscohexaster 55/A in diameter. The axial canals extend only to the end of the 

 basal thickened part (primary portion) of each ray. The microdiscohexasters (VII. Ik) 

 are 40/x. in diameter, the primary rays being 7 5/x in length. 



W.Q., June 3, 1903. No. 10 Hole. 238 m. (130 fms.). 



ANAULOSOMA.* 



Rossellinse 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, calycocomes, discohexasters, and microdiscohexasters. The new genus 

 resembles Bolosoma, Caulopliacus, and Aulochone in having an exposed gastral surface. 

 Among the Rossellinse, Anaulosoma agrees with Aulochone and Aulosoccus in being 



* d, privative ; aiSXij, hall ; <ra>na, body. 



