HYALONEMA (OOXEMA) BIANTHORATUM PINULINA. 



317 



upper part of the stalk imbedded in the sponge-body are not centrotyle am- 

 phioxes. The largest one observed was 7 mm. long. 



The acanthophores (Plate 83, figs. 1-35) are normally composed of one 

 to six rays. One quite abnormal one (Plate 82, fig. 24), which I found in speci- 

 men a, has two long and six more or less reduced rays. 



"^ V"" o cri Number of spicules of this relative 



I M I I I [ I I I I I I I I thickness. 



Fig. IS. — Amphioxes. 



