NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 83 



Polyodontes gracilis Pflugfelder (1932, pp. 288-290, fig. 8) from 

 Sumatra, to Panthalis. 



Acoetes magnifica Treadwell (1929, pp. 1-4, figs. 1-7) from the West 

 Indies has penicillate setae. Fauvel (1932, p. 37) considered 

 this identical with Polyodontes melanonotus (Grube). It ap- 

 pears, however, in view of the differences in the setae, that this 

 view is not tenable. A. magnifica does agree reasonably well with 

 the description of Panthalis pustulata Treadwell (1924, pp. 7-9, 

 figs. 10-15) from the West Indies. 



Polyodontes inortenseni Monro (1928a, pp. 569-572, figs. 19-24) from 

 Panama has penicillate setae, hence a Panthalis. 



The collections of the Allan Hancock Pacific Expeditions include 3 

 species of Polyodontes as described below. 



Polyodontes oculea (Treadwell) 



Plate 24, Figs. 294-299 



Panthalis oculea Treadwell, 1902, pp. 188-189, figs. 14-18. 

 Polyodontes oculea Monro, 1928a, pp. 572-575, figs. 25-30. 



Collections. — 216-34, 502-36. Three anterior fragments. 



The first parapodium (segment 2) is elongated (pi. 24, fig. 294) 

 considerably more than found by Monro (1928a, fig. 26) but lacks 

 the contraction wrinkles indicated by the latter. The second parapodium 

 is notably shorter, resembling those more posteriorly (pi. 24, fig. 296). 

 Median neuropodia are truncate, deepest distally (pi. 24, fig. 295). 

 The superior neuropodial setae are slender, tapering, slightly thick- 

 ened (pi. 24, fig. 299) where they emerge from the parapodial lobe, 

 the serrations obscure. Median neuropodial setae have a long, slender 

 appendage (pi. 24, fig. 297). Inferiormost setae are only weakly sickle- 

 shaped, the point long, the serrations more or less distinct (pi. 24, 

 fig. 298). 



Elytra are entire, the surface smooth, without hooks or spines, trans- 

 lucent, with a narrow black border where they are left uncovered by 

 the preceding elytrum. At the anteroectal edge the margin is recurved 

 dorsally to form a pouch. From the fourth segment, the anterior face 

 of the parapodium has a few, short, branchial lobes. 



The base of the median antenna arises near the posterior margin of 

 the prostomium and its surface is covered with minute papillae as shown 

 by Monro (1928a, fig. 25). Because of these characteristics, the identity 



