152 Leodicidoc jrom Fiji and Samoa. 



decidedly bifid. The tentacles of simplex are twice as long as the prostomium, while 

 in macintoshi they hardly reach its anterior border. 



The prostomium (plate 5, fig. 8) is about half as long as the peristomium and de- 

 cidedly bifid, with a definite angle at the anterior and the outer posterior portion of 

 each half. The tentacles are rather stout, smooth, tapering at the ends, the unpaired 

 and inner paired ones nearly equal in length, the outer paired ones much shorter. 

 In the preserved material their bases are colored much like the prostomium, but at the 

 ends they are very dark brown, nearly black in color. No eyes are \dsible in the pre- 

 served material. The prostomium is about twice as long as the second somite; the 

 two somites together are about as long as they are wide. There is no color in the 

 anterior region, but the surface is very iridescent. This shades into a dirty gray pos- 

 teriorly and toward the posterior end there is a faint trace of purple, due apparently to 

 the tint of the intestine. Anteriorly the body is rounded, posteriorly it is much flattened. 



The animal is 100 mm. long, Mith a peristomial width of 2 mm., a greatest body- 

 width counting parapodia of 4 mm., and contains about 200 somites. It seems to be 

 entire, but lacks anal cirri. 



The gills begin as a single short filament on somite 242, the number increases to 2 

 on about somite 30 (plate 5, fig. 10) there is later an increase to 3, and throughout 

 the greater portion of the gill region the number is 4 (plate 5, fig. 11). The last gill is 

 on about the twentieth somite from the posterior end, the decrease in number of 

 filaments being very abrupt at the end. 



The parapodia are unusually uniform in size throughout the body. The tenth 

 (plate 5, fig. 9) has a short anterior and a rounded posterior lip, with aciculse protruding 

 from between the lips. The ventral cirrus is rounded, the dorsal cirrus pointed at 

 the apex. The forty-fifth parapodium does not show the distinction between anterior 

 and posterior setal lips shown by the tenth, and the dorsal cirrus is narrower (plate 5, 

 fig. 10). A bifid gill arises from the dorsal surface and there are 2 dorsal and 2 ventral 

 acicufe. A tuft of needle aciculae extends into the dorsal cirrus. A posterior para- 

 podium (plate 5, fig. 11) differs from the forty-fifth, mainly in the greater gill develop- 

 ment. It has one dorsal and one ventral acicula and needle aciculs in the dorsal 

 cirrus. I could not find any of these needle aciculse in the dorsal cirrus of the tenth 

 parapodium. 



The dorsal aciculae are straight with rounded ends, while the ventral ones have 

 the usual form, with a terminal and a subterminal tooth and a hood (text-fig. 39). 



No compound setse were to be found. The simple setae are very long and slender, 

 showing nowhere any indication of a broadening from the average width of the 

 stalk, but tapering apically to a very slender point, the whole setae thrown into several 

 curves. Along one margin there may be a series of very small denticulations. The 

 simple setse are quite similar in form throughout the body, varying only in the number 

 of curves, in length, and in the sharpness of the marginal denticulation. 



Pectinate setse occur sparingly in anterior somites, a parapodium from the region 

 of somite 45 showing two, but I could find none in the parapodium drawn in figure 9. 

 At the extreme posterior end they are more prominent. They are all of one kind, with 

 a broad unsymmetrical end and about 25 very slender teeth. 



The maxilla is dark broAATi in color. The whole jaw apparatus was broken in 

 removing it from the body, and I am unable to give all of the details of its structure. 

 The carriers are broken (plate 5, fig. 12). The forceps are long and not much curved, 

 the left proximal plate has 5 teeth, and apparently the right one has 5 or 6. The 

 right distal paired plate has 8 teeth, the left paired has 2, the unpaired has 9. The 

 forceps are dark brown, the other plates much lighter in tint, but colored dark brown 

 along the edge where the teeth are. The mandible was too badly broken to describe, 

 so that aside from the statement that along the cutting edge and on the shaft there is 

 much dark pigment I am unable to make anj' statements concerning it. 



The type is in the American Museum of Natural History. 



