126 THE ANATOMY OF INVERTEBRATED ANIMALS. 



FIG. 22. A, Diphyes apjjendiculata.a. hydranths and hydrophyllia on the hydroeoma ; 

 ft, proximal nectocalyx ; c, aperture of distal nectocalyx; d, somatocyst; e, pro- 

 longation of the distal nectocalyx, by which it is attached to the hydrosoma ; 

 /, point or attachment of the hydrosoma in the cavity, or hydroecium, of the proxi- 

 mal nectocalyx. B, the distal nectocalyx with the canal (through which the bris- 

 tle a is passed), which is traversed by the hydrosoma in A. <?, extremity of the 

 distal nectocalyx, with its muscular velum. 



which are traversed by canals which unite, pass through the 

 pillars, and open into the central cavity of the umbrella. 1 



FIG 23. A, , IMphyzoOid (Sphenoides\ lateral and front views. <?, DiphyzoOid of 

 Abyla (Cuboides). a,e< gnanpbore or reproductive onran; h, hydranth; c, phyl- 

 locyst or cavity of hydrophyllium, with its process (d). D, free gonophore, its 

 manubrium (a) containing ova. 



1 The species of Cephea, the anatomy of which is here given, was obtained 

 in the South Pacific, near the Louisiade Archipelago, on the llth of July, 1849. 



