156 



Leodicidic from Fiji and Samoa. 



2, the line of separation between the two being 

 very indistinct. Later somites continue in gen- 

 eral the diameter of the first two, with a narrow- 

 ing and a flattening toward the posterior end, 

 which carries one pair of rather heavy anal cirri. 



Each anterior parapodium (plate 6, fig. 15) has 

 a single acicula which is very dark brown in color 

 except for the very apex, contained in a rounded 

 setal lobe. The dorsal cirrus is long and slender, 

 the ventral one much shorter. Posteriorly the 

 only change in the parapodium is that the setal 

 lobe becomes more pointed. The setae are very 

 small (note the scale of text-fig. 45) ; the simple 

 ones broaden near the end and narrow to a very 

 fine point (text-fig. 46) ; the compound ones have 

 inconspicuous teeth on their hooded terminaljoints 

 (text-fig. 45). 



The jaws are extremely small and very easily 

 broken. The carrier (plate 6, fig. 16) is larger than 

 the forceps, being broader and about of the same 

 length. The forceps has slender fangs. Each 

 proximal paired plate has lobings, hardly to be 

 called teeth. I was unable to get satisfactory 

 preparations of the distal plates, and beyond the 

 statement that there are two on one side and one 

 on the other I can say nothing of their structure. 

 The whole maxilla is pale yellow in transmitted 

 light, with a dark transverse band at the junction 

 between carrier and forceps. The mandible is 

 larger than the maxilla (note the difference in the 

 scale of magnification in the drawings), and is very thin and delicate (plate 6, fig. 17). 



In general form and in the structure of jaw and setae this species is closely related to 

 Lysidice tortugoB of the Gulf of Mexico (Treadwell, 1921o, p. 85, figs. 298 to 304). 



The type is in the American Museum of Natural History. 



Text-Figures 45 to 51. 



Lysidice 

 X 560; 



parva. 45, 

 46, simple 



45 and 46. 

 compound seta 

 seta X 250. 



47 to 50. Nicidion fusca-fasciata. 

 47, simple seta X 250; 48, simple seta 

 X 250; 49, compound seta X 250; 

 50, pectinate seta X 250. 



51. Compound seta of LumfertMercis 

 sphmrocephala X 250. 



Genus NICIDION Kinberg. 

 J. G. Kinberg, Annulata Nova, 1864, p. 564. 



Similar to Leodice in having 5 tentacles and a pair of nuchal cirri, but without gills. 

 The parapodial development, especially in the median and posterior regions, is very 

 slight. They might be mistaken for young Leodice in which the gills have not appeared, 

 but can be distinguished from these by the feeble parapodial structure. 



Nicidion fusca-fasciata, new species. 

 Plate 7, figure 5; text-figures 47 to 50. 



Collected near the Governor's wharf and on Aua Reef in Pago Pago Harbor, Samoa. 

 The prostomium is entirelj^ colorless, a little wider than the peristomium, and has a 

 very shallow anterior median notch. The unpaired and the inner paired tentacles 

 are yellowish brown in color, except for the extreme tips, which are without color. 

 The outer paired are entirely colorless. The median tentacle is as long as the first 

 3 somites, the others from the inner to the outer become progressively shorter. The 

 eyes are prominent. The peristomium is colorless and is longer than the two following 

 somites. Somites 2 and 3 are entirely colored, except for a small white patch on 

 either side of the mid-dorsal line on the anterior margin of each somite, and in somite 



