NO. 1 HARTMAN: POLYCHAETOUS ANNELIDS 181 



Parapodia are small, inconspicuous throughout, the postsetal lobe 

 longer than the presetal one, but not developed in any unique respect. 

 Anterior parapodia (pi. 13, fig. 295) resemble those farther back (pi. 13, 

 fig. 296) except that the postsetal lobe is slightly longer in the latter. 

 Setae include only smooth, slender (pi. 13, fig. 292) bilimbate ones, 

 number 3 or 4 in a parapodium, and are accompanied by a single, yellow 

 aciculum. 



Mandibles are believed to be absent. Maxillae are dark, with long, 

 slender, black carriers and a slender, unpaired piece nearly two thirds as 

 long; this is dark for a short distance near its point of attachment but 

 pale, translucent beyond ; its point of attachment is on a ventral boss of 

 the forceps, as seen in lateral view (pi, 13, figs. 291, 293). The forceps 

 are heavy, broad, conspicuous, well hooked, and provided with a sharp, 

 distal tooth. Maxillae II are weakly developed, each consists of a flat 

 plate, practically without teeth; they may be almost functionless in this 

 species. Maxillae III and IV have each a single, sharp tooth (pi. 13, fig. 

 291). The functional parts of the maxillae consist entirely of sharp 

 pointed pieces, perhaps serving as a piercing mechanism. 



This specimen was removed from the coelomic cavity of a fragment 

 of Eunice, possibly E. antennata Savigny. The host consists of a branchial 

 region of only 26 segments, from an area where the branchial filaments 

 decrease rapidly from a 7-filamented to a one-filamented condition. This 

 portion has large, nearly mature eggs. In the parapodia the acicular hooks 

 are clear yellow, distally tridentate, and the parapodial bases have dark 

 patches dorsally, as is typical for E. antennata. Since it is known to range 

 in this locality, the host is tentatively referred to this species. 



Labidognathus Caullery has heretofore been known through only a 

 single species, L. parasiticus Caullery (1914, p. 490) from the body 

 cavity of a terebellid, taken near Timor, Dutch East Indies, in 73 

 meters. The external parts, including parapodia and appendages, are 

 greatly reduced, the prostomium lacks eyespots, and the proboscidial 

 armature is greatly reduced, much as in our specimen. No mention is 

 made of mandibles, nor are they illustrated ; hence they are also perhaps 

 absent. The maxillae consist of heavy forceps, long carriers, and several 

 smaller pieces, but the relation of the parts is not quite clear. The un- 

 paired carrier is shown detached, perhaps an unnatural condition; maxil- 

 lae II are shown as rectangular, edentate plates, followed by an unpaired 

 plate and another distal paired plate. L. forcipes differs from L. parasiti- 

 cus in having a longer unpaired carrier and 3 pairs of plates in addition 

 to the maxillary forceps. It is parasitic in eunicids. 



