126 THE ANATOMY OF INVERTEBRATED ANIMALS. 



Fig. 22.— A, Diphyes appendiculata.—a, hydranths and hydrophyllia on the taydroBoma ; 

 6, 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 of 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. 0, 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, B< Diphyzooid (Sphenoides), lateral and front views. C, DiphvzoGid of 

 Abyla (Cuboides). a,e, gonophore or reproductive orsran ; b, hydranth; c, phyl- 

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

 manubrium (a) containing ova. 



1 The species of Cep7iea, the anatomy of which is here given, was obtained 

 in the South Pacific, near the Louisiade Archipelago, on the 11th of July, 1849. 



