NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 59 



tally to a sharp point, and project from the parapodium ; under high 

 magnification they appear pubescent beyond their geniculate part (pi, 2, 

 fig. 25). The simple, bilimbate setae are short, pointed, with scattered 

 serrations along both cutting edges (pi. 2, fig. 31). Pectinate setae, num- 

 bering 8 to 10 in a fascicle, are conspicuously oblique at their free end 

 (suggesting the specific name), and are provided with numerous, long, 

 slender teeth (pi. 1, figs. 24, 35). Those in far posterior segments do not 

 differ materially from those far forward. Subacicular hooks are yellow, 

 distally bidentate (pi. 2, figs. 29, 36), first present from the twelfth 

 setiger (coll. 373-34), fifteenth (coll. 369-35), seventeenth (coll. 930- 

 39), eighteenth (coll. 930-39), nineteenth (coll. 835-38), or tvt^enty- 

 second (coll. 833-38) segment. In a single collection (930-39) they first 

 occur from the fifteenth to the eighteenth segment. There are typically 

 2 in a parapodium and they are continued posteriorly to the end. A third 

 hook may be present, deeply embedded in the parapodial lobe. In seg- 

 ments far back the superior hook is sometimes acicular instead of biden- 

 tate, but with a narrow hood (pi. 2, fig. 30) ; its mate is bidentate as 

 usual. 



The proboscidial armature consists of mandibles (pi. 2, fig. 33) and 

 maxillae (pi. 2, fig. 32). The mandibles have hard, white calcareous 

 cutting edges and slender, black basal ends. The maxillary carriers are 

 broadly rounded (pi. 2, fig. 32) ; forceps are falcate; maxillae II have 8 

 or 9 teeth on either side; maxillae III have 11 and 8 teeth; maxilla IV 

 (on the left side) has 6 or 7 teeth, and maxilla V on either side is a 

 single tooth. 



The tube (pi. 16, fig. 331) is pale to dark gray, chitinized, tough, 

 appears straight, cylindrical, except for low ridges at irregular intervals. 

 It is more or less closely, but not densely, covered with attached particles 

 including shell fragments, which are usually attached on their convex 

 side. The tube might be designated trim. Its lining is thin, smooth, parch- 

 mentlike, and between this and the outer layer fine sand is packed, im- 

 parting a darker or lighter cast to the tube. 



Specimens from Peru, listed above, differ in some details from those 

 from Guatemala (type coll. 770-38). Branchiae are similarly present 

 from the fifth or fourth setiger; they are also largest between the seventh 

 and tenth setigers and diminish in size in about the same way, but they 

 are fuller and bushier than in the type. Occipital tentacles lack the inter- 

 calary rows of fine papillations, or at least they have not been distin- 

 guished. The tubes (pi. 16, figs. 332, 333), where present (coll. 364-35, 



