Notes on the Adult Anatomy of Solaster endeca. 177 



Fig. 3. See above. Stone canal now with characteristic form. Marginal spaces running 

 together to form aboral end of axial sinus. Dorsal sac with upper end of axial 

 organ and diverticulum from axial sinus invaginated into its lumen. 



Fig. 4. See above. Section still deeper, showing stone canal, etc., as well as the two 

 limbs of the aboral perihfemal sinus. 



Lettering in Figs. 1 to 4. 

 ab. s . aboral perihsemal sinus. 



amp. . central chamber of madreporite (ampullary part of axial sinus). 

 ax. org. axial organ. ax. s. . axial sinus. d. s. . dorsal sac. 



d. v. . diverticulum from central chamber of madreporite. 

 h. ab. s. haemal tissue within aboral perihsemal sinus. 

 p. c. (c) and p. c. (m) pore canals perforating the central and marginal areas of the 



madreporite. 

 tr. (c) and tr. (m) collecting spaces belonging to the central and marginal pore canals. 

 st. c. . stone canal. 



