State of Washington, in February and March 1920. 175 



parallel to one another. Behind the bases of the tentacles each lateral margin slopes 

 gently outward, so that the posterior margin of the prostomium is about equal to its 

 antero-posterior diameter. The posterior dorsal surface has a distinct tubercle situated 

 in a rather deep backward indentation of the anterior margin of the peristomium. 

 This tubercle may possibly be regarded as homologous to the third tentacle found in 

 the genus Eulalia, but in character of the setse this specimen differs widely from the 

 latter genus. The tentacles are short-lanceolate and equal in size. 



On its anterior margin the peristomium is wider than the prostomium and widens 

 still more posteriorly, so that its posterior margin is about twice as wide as the pro- 

 stomium. The anterior margin is incurved, forming a bay in which the tubercle on 

 the prostomium lies, and the 4 equal-sized tentacular cirri are on the lateral surfaces. 

 Ventral to these the peristomium is noticeably wider than it is on the dorsal surface. 

 The second somite is about half as long as the first, and succeeding somites increase 

 in width up to about the ninth. The mouth is bounded dorsally by the prostomium, 

 laterally and ventrally by the first somite. The dorsally directed anus has a rounded 

 lip and there is one pair of short and rather stout anal cirri. 



The first parapodium is on somite 2 and has rounded postsetal and presetal lobes 

 and a well-developed ventral cirrus (fig. 8), the dorsal cirrus being absent. There is 

 a single acicula, and a row of compound setae with rather short terminal joints. In 

 later parapodia the dorsal cirrus appears as a rather thick but not very large lobe. 

 It is small on somite 2 but increases in size farther back. A well-developed parapodium 

 is shown in figure 9. The presetal lobe is notched, while the postsetal is rounded. In 

 preserved material all of the dorsal cirri are deep brown in color, being especially in 

 the smaller specimens much darker than the general body-color. There is a sub and 

 a supra tuft of cilia, the former (fig. 10) with a slender basal portion enlarged and 

 toothed at the end. The terminal joint is flat, and at the base is as broad as the apex 

 of the basal portion, but it rapidly narrows to an acute apex with a row of minute den- 

 ticulations along the concave margin. The supra-acicular bundle is composed of 

 similar setae, but the terminal joint is longer and more slender. 



Collected at Friday Harbor. Type in the American Museum of Natural History. 



Family LEODICIDiE. 



Lumbrinereis zonata Johnson. 



Lumhriconereis zonata Johnson, 1901. The Polychseta of the Puget Sound Region. 

 Proc. Boston Soc. Nat. Hist. 29; pp. 408 to 409, pi. 9, figs. 93 to 100. 



This was the commonest annelid in the Friday Harbor collections. Measurements 

 of living annelids, especially members of this genus where there is very great power 

 of contractility, are of little value, but I found that preserved specunens vary in length 

 from 100 to 300 mm. with a prostomial width of not more than 1.5 mm. and a body- 

 width of 2 mm. The general body-color in life is dark brown with a marked iridescence, 

 and it can be distinguished from the only other species of this genus that I collected 

 in this locality by the fact that in the other (L. cervicalis, see below) there is a noticeable 

 brown nuchal band, easily seen with the naked eye, and the body is a lighter brown. 

 Under the hand lens (in L. zonata) a transverse band of brownish-gray dots may be 

 seen running across the middle of each somite, and these may be the foundation of 

 the dark transverse bands which appear in preserved material and were the reason for 

 Johnson's specific name. This transverse dark band, appearing only in preserved 

 material, occurs after preservation in a number of Lumbrinereids, so that its value as 

 a specific character is small. The prostomium is not quite as acutely pointed ante- 

 riorly as in Johnson's figures and the anterior peristomial line is straight rather than 

 concave. The following additions are made to Johnson's description. 



The mandibles (fig. 12) are transparent, except where marked along their cutting 

 edges with dark pigment. This is darkest at the outer angles and diminishes in 



