ANNOTATIONS. 85 



the formidable instruments with which the tentacles are 

 armed, large, bean-shaped cells are sometimes crowded 

 together in immense quantities, as, for example, in the 

 ectoderm of the ccenosarc in Hydranihea^ and in the outer 

 covering of its gonophore. It is difficult to imagine what 

 relation these can bear to the economy of the animal." 



To this Mr. Rufford adds the following : 



" The thread-cells on Ectoderm of 

 Ccenosarc and Gonophore may be of service 

 when some member of colony is defunct ; as I 

 have frequently seen Infusoria, etc., invade 

 the space between Ccenosarc and polypary, 

 having obtained access through the decay of 

 one or more polypites. In some cases, 

 however, I believe the decaying end is closed." 

 P. R. 



Page XIX., line 9 from the top. 



" In the genera Hydr actinia and Podocoryne. . . . 

 some curious appendages occur in addition to the 

 alimentary polypite. . . . We have first the spiral 

 bodies." 



These Mr. Eufford designates as " Snake-like 



zooids in Hydr actinia." 



The place of development of these appendages, and 

 the energy they display is then described in the text. At 

 the end of this , aragraph "They usually form a somewhat 

 dense fringe round the mouth of the shell [which is almost 

 always* tenanted by a Hermit crab], and are roused from 



*The words " almost always " are underlined with pencil. 



