64 CYMODOCEIDiE. 



dages of the mouth being furnished witli rudimentary 

 acetabular or suckers, liiie those of the Cuttle-fishes. 



Species of Spongiohranchia. 

 australis, UOrh. elongata, UOrh. 



Genus TRICHOCYCLUS, Eschscholtz. 



Body elongate. Head produced, conical, with two 

 lateral tentacles. Fins two, oblong, lateral, with a lanceo- 

 late intermediate lobe. Gills in a ciliated ring round the 

 middle of the abdomen, and with a similar ring round the 

 base of the head and on the hinder end of the body. 



Ex. T. Dumerilii, Esclisclioltz, pi. 7, fig. 11. 



There is but a single species of this curious genus, which 

 we believe has not, however, been met with since it was 

 first described and figured by its discoverer in the " Isis" 

 of Oken. 



Genus PELAGIA, Quoy and Gaimard. 



Animal gelatinous, rough, transparent, Body oval, 

 elongate, contracted in the middle ; head indistinct, with 

 two small tubercles ; mouth hidden. Fins two, lateral, at 

 the contraction of the body ; vent at the base of the right 

 fin ; nerves very apparent. 



Esc. P. alba, Quoy and Gaimard, pi. 7, fig. 12. 



Pelagla, as its name implies, inhabits the high seas; 

 there is but one species known, which is white-netted and 

 rough, with submedial rounded striated fins. 



Fam. CYMODOCEID^. 

 Body divided into two parts. Wings four, two on each 



