52 ACALEPHA. 



Alcinoe (Cuv.). Body furnished witli swimming 

 lobes and oral tentacles : (fig. 88).* 



A. rotunda. 

 Smithii. 



Order III. SIPHONOPHORA. 



Animals double, bell-shaped ; one fitting 

 into the cavity of the other Diphyidce. 



Animal consisting of a large air-vessel, with 

 numerous tentacles Physaliada. 



Animal stretched over a cartilaginous plate. Velellada. 



Family I. Diphyim:. 



Diphyes (Cuv.). Animals similar, pyramidal, 

 with a few points around the aperture. 



D. campanulifera (?) Fig. 89 ; mag. -6-. 



Family II. Physaliad^e. 



Physalia (Lamk.). Air-vessel large, oblong, 

 with a wrinkled crest ; tentacles of several forms, 

 long, pendent from near one end of the vessel. 



P. pelagica. Fig. 90 ; \n. s. 



Family III. Velellad^e. 



Velella (Lamk.). Body oval, flat, with an 

 oblique vertical cartilaginous crest above, and a 

 central tubular mouth below, surrounded by 

 numerous short tentacles. 



V. vulgaris. Fig. 91 ; n. s. 



* The figure (88) represents A. vermiculata, found in the 

 South Atlantic. I am not aware that any published figure of 

 either of our native species exists. 



