98 PHYLLIRRHOIDiE. 



Genus PHYLLIRRHOE, Peron and Lesueur. 



Head with a short rounded muzzle and horny jaws; 

 tentacles long and filamentary ; eyes none. Body trans- 

 lucent, fusiform, laterally compressed, ending posteriorly in 

 a vertical, flattened, truncate, or bi-lobed caudal fin. 



Syn. Eurydice, Eschscholtz. 



Ex. P. punctulatum, Quoy and Gaimard, pi. 70, fig. 3. 



No indication of external gills has been detected in 

 these animals, which in all probability respire by the skin 

 like some species of Firoloidece, where the branchiae are only 

 indicated by a ciliated sub-spiral band. 



Species of Phyllirrhoe. 



Amboiuensis, Quoy and Gaim. punctulatum, Quoy and 



bucephala, Peron and Lesueur. Gaim. 



Lichtensteinii, Eschsch. roseum, D'Orb. 



rubrum, Quoy and Gaim. 



Genus ACURA, H. and A. Adams. 



Head with a rounded, obtuse muzzle ; tentacles long, 

 flattened, and filamentary ; eyes none ; mouth with two 

 transverse, lunate, horny mandibles. Body laterally com- 

 pressed, ending behind in a long, slender, simple, pointed 

 caudal appendage. 



Ex. A. pelagica, A. Adams, pi. 70, fig. 4. 



The animals on which tbis genus is founded chiefly differ 

 from Phyllirrhoe in the simple and elongate caudal fin. 

 Specimens were procured in the middle of the South 

 Atlantic in which the upper and lower margins of the 



