CLYTIA JOHNSTON I. 55 



cup-like receptacles with toothed rims, in 

 which the polypite is comfortably ensconced, 

 and where it can expand or withdraw at will, 



In the ATHECATA, two species (Perigoni- 

 mus repens and Garveia nutans) have been 

 mentioned in which a rough expansion of the 

 polypary takes place, but there is a great 

 difference between those species and the beau- 

 tifully finished chalices of the THECAPHORA, 

 of which C. Johnstoni forms a good example. 

 The stems are ringed or wrinkled at the top 

 and bottom, and occasionally in the middle. 

 The polypite has a single circle of tentacles. 

 The gonophores are borne on the creeping 



(A). " Alimentary" polypite, tentacles retracted. 



(B). " Select " polypite and modified receptacle, the repro- 

 ductive buds being produced within the darkly shaded 

 enclosure which represents the " Select" polypite. 



(C). The freed reproductive bud, or jelly fish, seen rather 

 from below. 



(a). Stomach, or polypite, with the mouth at the free end. 



(b). One of the radiating canals, with reproductive sack. 



(c). Bell tentacles. 



(d). Organ of sight, Ocellus. 



(e). Lithocyst. 



(v). Veil, a thin membrane partly enclosing bell-cavity. 



