LEPTOMEDUSjE — CLYTIA. 



26.3 



Adult medusa. — Bell about 5.5 mm. in diameter. It is about 3 times as broad as high ; 

 sides flare outward. 16 slender tentacles with well-developed basal bulbs. 16 lithocysts, each 

 containing a single concretion, alternate with tentacles. Velum well developed. There are 

 4 straight, narrow radial-canals and a slendercircular vessel. Manubrium short with 4 slightly 

 recurved lips. Gonads at middle points of the 4 radial-canals, spindle-shaped, and about one- 

 fourth as long as the radial tubes upon which they are developed. More or less brown pig- 

 ment is found in the entoderm of the tentacle-bulbs, manubrium, and gonads; all other parts 

 of the medusa are transparent. 



Fig. 135. — HydroiJ of Clytia johnsionii, after Hincks, in British Hydroid Zoophytes. 



Fig. 136.— Young medusa of Chtia johnslonii, after Hincks, in British Hydroid Zoophytes= Clytia volubilis. 



Fig. 137. — "Eucope campanulaia" after Gegenbaur, in Zeit. fur wissen. Zool., Bd. %=Clytia volubilis. 



Fig. 138. — "Eucope campanulata," after Haeckel, 1879. 



Fig. 139. — "Eucope aflinis," after Gegenbaur, in Zeit. fur wissen. Zoo\.= Clytia volubilis. 



Hydroid and young medusa. — The hydroid stock is "Clytia bicophora" L. Agassiz 

 (plate 32, fig. 1), which is in all probability specifically identical with Clytia johnstonu Hincks 

 = C. volubilis Lamouroux. The hydroid is quite common in shallow tide-pools along the New 

 England coast, where it is found attached to sea-weeds or to stems of other hydroids. The 



