428 



PROCEEDINGS OF SECTION C. 



nature it may be set down as subserving an asexual (?) reproductive 

 function. It would appear to be antagonistic to that free passage 

 (of water and food) from the interior cavity to the exterior, which all 

 the other structures seem designed to allow. On many of the very 

 large cups patches of this lamellar structure mark where a smaller 

 individual is united to the larger. Hence the rhizoids may be set down 



Fig. 2. 



Slightly oblique vertical section through lower portion of a small 

 Cup, cutting through the Central Cavity (A), the Inner Perforate Wall 

 (I), the ^^ Septa" with Dissepiments [S), the Outer Fe>f orate Wall 

 (0), the Inner (R) and Outer (L) Jihizoid Lamella. (From micro- 

 photograph. j 



as an exothecal growth from the outer wall in the older portion of the 

 organism, which may be analogous in part to the stolonal outgrowths 

 of many modern Coelenterata, serving for attachment and asexual 

 reproduction. 



In fig. 3 (text) is represented the relatively tremendous growth 

 of the rhizoids around the base of the small cup A (cross section). 

 Probably the lamellae here also function protectively, as they may be 

 noticed winding round the surface of the calice some distance from the 

 point of attachment. It is of course possible that the young Archseo- 

 cyathenoid has merely made use of the older individual — shown in the 

 upper part of the figure — as an anchor ; but serial sections seem to 

 show that a more intimate relationship is present. In one of the loculi 



