Leodicidce from Fiji and Samoa. 



145 



In general appearance this species is very similar to Leodice biformi-cirrata, if 

 individuals of the same size are compared, but differ decidedly from larger individuals 

 of the latter species. In L. biformi-cirrata the cirri and gills are large relatively to the 

 somite; in L. armillata behind the middle region the somites are short, thick, and much 

 rounded, with relatively very short parapodia. In small L. biformi-cirrata gills are 

 absent from a considerable number of the posterior somites and there is one pair of 

 articulated anal cirri; in L. armillata, even in the small individuals, the gills are con- 

 tinued to within 10 somites of the py- 

 gidiura and there are two pairs of non- 

 articulated anal cirri (plate 3, fig. 15). 



The prostomium (plate 3, fig. 14) is 

 bilobed, rather narrower than the peri- 

 stomium. The tentacles are all monili- 

 form without evident cirrophores, with 

 about 25 joints in the median, 18 in the 

 inner paired, and not more than 10 in 

 the outer paired. The relative lengths 

 of these tentacles in preserved material 

 is indicated in figure 14. The eyes are 

 prominent and lie in the usual position. 

 The anterior border of the peristomium 

 is produced into a narrow collar-like 

 structure which protrudes to a short 

 distance over the prostomium. The 

 width of the peristomium is about twice 

 that of its length; toward its posterior 

 dorsal surface it has a prominent white 

 spot, the remainder of its surface being 

 tinted light brown. The animal figured 

 was 2 mm. wide at the peristomium, 60 

 mm. long., and had 160 somites. The 

 second somite is about one-third as long 

 as the first, its nuchal cirri without artic- 

 ulations and shorter than the peri- 

 stomium. , , i. .J 



The gills begin with 1 filament on the sixth setigerous somite. On the left side of 

 the body the eighth somite has a gill with 2 filaments, while on the right side the seventh 

 and eighth each has 1 filament and the ninth has 3. Throughout the remainder of 

 the anterior two-thirds of the body the number of filaments in each gill varies from 

 2 to 3. The number is reduced to 1 in the posterior one-third, not more than 10 of 

 the terminal somites being without gills. 



The tenth parapodium (plate 3, fig. 16) has a relatively small setal lobe with only a 

 slight distinction between the anterior and posterior lips, while the ventral cirrus is 

 supported on a swelling that is almost as large as the setal portion. The dorsal cirrus 

 is long and slender, shaped much like the gill which rises at its base, the diameter of 

 the gill being only a very little smaller than that of the cirrus. There are 2 straight 

 aciculie, and needle aciculse appear in the dorsal cirrus. A posterior parapodium (plate 

 3, fig. 17) is small as compared with the vertical height of the somite. Each has a 

 rounded post-setal lobe with two dorsal aciculse and a ventral one, all nearly colorless 

 or very faint yellowish brown. The dorsal aciculse have curved apices, one more 

 curved than the other (text-fig. 28), while the ventral one is bidentate (text-fig. 29). 



The compound seta (text-fig. 26) has rather a stout basal shaft with a few indistinct 

 denticulations along the longer edge. The terminal joint is small, the apex bidentate. 

 There are only a few of these compound setae in each somite and their basal portions 



3^ 30 



Text-Fiqures 26 to 33. 



26 to 29. Leodice armillata. 26, compound 

 seta X 185; 27, simple seta X 185; 28, dorsal 

 acicula X 185; 29, ventral acicula X 185. 



30 to 33. Leodice crassi-tentaculata. 30, simple 

 seta X 250; 31, compound seta X 250; 32. 

 dorsal acicula X 250; 33. ventral acicula X 250. 



