NOTE ON SARCODICTYON. 327 



dictijon agglomerata, Forbes, and S. rugosum, Pourtales. 

 I have already expressed my opinion above that the former 

 of these must be merged in S. catenata, and I feel that we 

 require further detailed information about Pourtales' West 

 Indian form before being able to decide either that it is 

 distinct from S. catenata or that it really belongs to the 

 genus Sarcodictijon. 'FinaAly, Bhizoxenia Jiliformis, Sars, 

 B. alba, Grieg, and B. albicolor, Norman, probably fall 

 into our genus, but whether they are all distinct from 

 Sarcodictyon catenata I cannot say. 



Explanation of Plate VIII. 



Fig. 1. Colony of bright yellow form of Sarcodictyon 



catenata, (this is the S. agglomerata of Forbes), 



nat. size, painted from life. 

 Fig. 2. Colony of pale yellow form, nat. size. 

 Fig. 3. Expanded polype of ordinary red form, enlarged. 

 Fig. 4. Expanded polype of yellow form, enlarged. 

 Fig. 5. Anterior end of another expanded yellow polype. 

 Fig. 6. Series of spicules from the body- wall of a yellow 



form(X 200). 

 Fig. 7. Part of a horizontal section through a yellow 



colony, showing two polypes cut in section, with 



yellow spicules in the outer body- wall and in the 



stolon, and colourless spicules in the invaginated 



part of the polype ( X 50) . 

 Fig. 8. Part of a section of a yellow polype showing zone 



of spicules ( X 50) . 

 Fig. 9. A vertical section of a pale yellow polype (X 50). 

 Fig. 10. Part of a transverse section of a yellow polype 



showing the ova in their capsules attached by 



pedicles to a mesentery, (X 200). 



