AKT. 23. A NEW MARINE ANNELID FROM CHILE TREADWELL, 3 



the dorsal cirri, and a poorly defined band of brown pigment extends 

 along the mid-dorsal line of the body broken only by a prominent 

 white patch in each somite near the dorsal anterior margin. This 

 coloration is more sharply marked toward the posterior end of the 

 fragment. On the dorsal surface of somites which do not carry cirro- 

 pliores is a rounded lobe lying in line with the cirrophores of other 

 somites (fig. 2) and toward the posterior part of the specimen these 

 Imobs show the same brown color. 



The protruded proboscis is about twice as long as the palps and 

 has at the apex, above and below, nine prominent conical marginal 

 lobes. 



Most of the elytra are lost, but they evidently did not cover the 

 dorsal surface when in place. They are roughly circular in outline, 

 are more or less mottled with brown and under low power, because 

 of the distribution of this pigment, look as if the margins were 

 thicker than the center. This is apparently merely an effect produced 

 by the pigment. The elytron is thickly studded over its surface with 

 short sharp conical spines which extend to the margins and some- 

 times protrude beyond this. 



The neuropodium (fig. 2), has an obliquely truncated setal lobe, 

 with the upper outer angle prolonged into a conical " tongue " into 

 which the apex of the acicula extends. Aside from this terminal 

 protrusion the neuropodium is cylindrical, showing no narrowing 

 up to the point where the truncation begins. The neural setae are 

 smaller than the notal and are golden yellow in color. Each has 

 (fig. 3) transversely arranged plates whose free margins are dentic- 

 ulated. These plates are longer than the width of the seta so that 

 seen in full face they extend on both sides of the shaft. In profile 

 they have the appearance shown in the figure. The notopodial lobe 

 of the parapodium is rounded in form and is shorter than the neuro- 

 podial but has a similar apical " tongue " into which the acicula ex- 

 tends. The notopodial setae are chestnut-brown in color and are 

 larger than the neuropodial. Each seta (fig. 4) has transverse rows 

 of spines the row nearest the apex being the shortest and from here 

 there is a gradual increase in length so that the longest are more than 

 half as long as the diameter of the seta. 



Type.— C?ii. No. 19101, U.S.N.M. 



