52 ACALEPHA. 



Alcinoe (Cuv.). Body furnished with 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 Diphyida. 



Animal consisting of a large air-vessel, with 

 numerous tentacles Physaiiada. 



Animal stretched over a cartilaginous plate. Vdellada. 



FAMILY I. DIPHYID^. 



DipJiyes (Cuv.). Animals similar, pyramidal, 

 with a few points around the aperture. 



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



FAMILY II. PHYSALIAD^. 



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. Tig. 90 ; i 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. 



