142 



ART. 7. — I. IJIMA : IIEXACTIXELLIDA, IV. 



Text-figure G. Acanthascus cactus. 

 All about \ natural size. 



A. — S. ( '. M. Xo. 428. Two persons in connection with 



each (ither at l)asc. The larger person : 140 mm. 



high; 70 mm. hy 4.']nnn. broad at middle; osculum 



about 41mm. dia.; Mall Ô mna. thick at middle. 

 E.— Ö. C. M. jS'o. 42U. 200mm. high; osculum 210 



)nm. by 148 mm.; wall 7 mm. thick at middle, 



10 mm. lower down. 

 C.-S. C. M. No. 4;;(l. ;;i.")mn:. liigh; lUOmui. by 86 



mm. broad at middU'; osculum 140 l)y llônnn.; 



wall 8 nnn. thick at michlle and 10mm. near base. 

 1».-S. ('. :M. No. 4;!]. 470 nnn. high; 140mm. broad 



at middle; osculum 178 mm.; wall S mm. thick at 



middle. 



vasc, l)roa(-k'8t at or near the top and narrowed 

 towards the base. Young ;ind small individuals 



generally show the wall somewhat closed in at the oscular margin. 



This, in the larger specimens, is usually directed straight upwards 



