24 



MISS EUTH M. HARRISON ON NEW ALCTONARIA 



any connection between it and the porous rod in the main trunk. 

 appearance of this discontinuity externally. 



There is no 



Fig. 5. 



Transverse section through the tubular main trunk of Solcnocaiilon tortuosum, specimen B, decalcified, 

 showing the position of the " porous rod " and arrangement of the nutritive canals. 



Fig. 6. 



Fig. 7. 



Fig. 6. — Transverse section through a terminal twig of Solenocaulon tortuosum, specimen B, decalcified. The 

 section passes immediately below a polyp on the right-hand side ; hence the nutritive canals of that 

 side are pushed from the periphery nearer the central " porous rod." Note the absence of nutritive 

 canals from the grooved (upper) surface. 



Fig. 7. — Quadrant of a transverse section through the stalk of Solenocuulon tortuosum, specimen B, showing 

 the absence of the " porous rod." 



The spiculation of these three specimens, and indeed that of S. ramosum, shows a 

 very remarkable conformity. In all the bark consists of numerous small, more or 



