236 I. IJIMA : HEXACTINELLIDA. I. 



The paratangentials lie in direct contact with the parenchymalia 

 and often run in association with bundles of these. It may be 

 worth while to note that not infrequently some parenchymal 

 fibers or strands intersect the paratangentials on the inner side. 



Rarely and exceptionally there occur stauractins or thetac- 

 tins in the place of pentactin gastralia. 



Pentactin canalarla have not been observed. 



The floricomes (PI. VIII, fig. 23) are of typical form, meas- 

 uring 98-107 /^ in diameter. The number of terminals in a 

 perianth is usually 6, sometimes 7 or 8. The terminal disc 

 bears rather strong teeth, as a rule 3 (seldom only 2) in number. 

 The inner border of the disc, when seen in lateral view, is 

 indicated by a rounded angular bending of the contour-line on 

 that side. 



The floricomes are very common in depressed and therefore 

 protected positions of the external surface. In regions immedi- 

 ately around the parietal oscula, every distal ray of the dermalia 

 may be said to bear a floricome on its tip. In exposed parts 

 of the ledges they occur but rarely, whether in the position 

 just mentioned or in the subdermal region. 



Graphioco/iies in an intact state are exceedingly rare. Of 

 common occurrence is their central portion (PL VIII, fig. 36) 

 after the loss of the rhaphides. Such a relic consists of six 

 principals, about 3 y- thick and 15 /^ long, each bearing at its 

 ..ijßud a small disc, the outer surface of which is beset with short 

 basal remnants of the rhaphides. 



^The rhaphides, 180-200 !'■ long, occur very abundantly, cither 

 in shelves or in a scattered state, in the ectosomal region. As 



