Leodicidce from Fiji and Samoa. 103 



Genus OENONE Savigny. 

 J. C. Savigny, Systfeme des Ann^lides, etc., 1820. 



Prostomium with 3 short tentacles which may be covered by the anterior border of 

 the peristomium. Two lobes of the dorsal surface of the peristomium may be pro- 

 truded so as to cover the prostomium or be retracted into pits. Two pairs of prostomial 

 eyes. The dorsal cirri are flattened plates. Maxilla with long, slender carriers and 2 

 series of toothed plates which may or may not be symmetrical on the two sides. 

 Mandible short and broad. Setae all simple, in a vertical row between the two lobes 



of the parapodium. 



Oenone fulgida Savigny. 



Text-figures 57 to 64. 



Aglaura fulgida Savigny, 1820, p. 55, pi. 5, fig. 2. 



Oenone lucida Savigny, 1820, p. 56, pi. 5, fig. 3. 



Aglaurides fulgida Fauvel, 1917, p. 240-254, pi. 6, figs. 52 to 55. 



For a diagnosis of the species and a full literature list see the paper by Fauvel. 

 Collected at Aua Reef and near the governor's wharf at Pago Pago Harbor, Samoa. 

 The living animals are yellowish brown in color and very iridescent, but have no 



57 to 59. Oenone fulgida from Samoa 

 59, one-hundredth parapodium X 5. 



60 to 62. Oenone diphyllidia from Tobago 

 62, one-hundredth parapodium X 5. 



Text-Figures 57 to 62. 



57, anterior end X 5; 5S, tenth parapodium X 5; 



60, anterior end X 5; Gl tenth parapodium X 5; 



special pigment markings. They are very active in confinement and will crawl out of 

 uncovered dishes. The prostomium is broadly rounded, with 3 tentacles and evertible 

 nuchal organs which appear when the animal is moving. There are two pairs of eyes, 

 the outer ones larger than the inner. After preservation the body-pigment turns to a 

 brownish purple which is darker in some individuals than in others and in all cases is 

 of a lighter tint ventrally than dorsally. In some cases in the preserved material 

 this pigment completely obscures the eyes, while in others the smaller pair only are 

 invisible. It seems probable that this condition is responsible for confusion in the 

 classification of this and related species, some of which have been described as having 

 only one pair or no eyes. 



The peristomium is wider than the prostomium and usually is a little wider than the 

 first setigerous somite. In some individuals there is a faint constriction, especially 

 noticeable on the lateral and ventral areas, which obviously marks the boundary 

 between the first and second somites. By a number of writers the possession of one 

 or two apodous somites has been regarded as of importance in the separation of genera. 

 If this distinction really occurs it would be important as indicating that the second 

 apodous somite of one genus is homologous with the first setigerous of another. In 

 my study of the Leodicida? I have found so much variability between closely allied 



