60 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



369-35 and 835-38), are coarser, more fragile, with miscellaneous, ir- 

 regularly arranged, attached objects, the shell particles sometimes at- 

 tached on edge instead of convex side; the particles appear much more 

 crowded. In all individuals, however, pectinate setae are strongly oblique, 

 and other details compare favorably. I am inclined to believe that these 

 specimens are identical with some Ehlers (1901, p. 123) designated D. 

 chiliensis Quatrefages (see discussion below, under D. chiliensis). An- 

 other reference is suggested in the figure of a pectinate seta (Moore, 

 1911, p. 73) based on a posterior end taken from a collection of Onuphis 

 vexillaria from off San Diego, California. One of the collections (930- 

 39) similarly includes fragments of an Onuphis and of Diopatra obliqua; 

 by comparison of their respective pectinate setae, it is possible to allocate 

 them to their respective species. 



Holotype. — AHF no. 36. 



Type locality. — Off San Jose light, Guatemala, in 7-11 fms (coll. 

 770-38). 



Distribution. — Peru, north to Lower California; intertidal to 25 fms. 



Discussion of D. chiliensis and its affinities with D. obliqua (above). 

 — Diopatra chiliensis Quatrefages (1865, p. 342) was originally very 

 generally described, based on collections from Chile; no reference to fig- 

 ures was made. Branchiae were said to be well developed from the fifth 

 ring [fourth setiger?] through 10 to 12 following segments, disappear- 

 ing at the thirty-third ring, but this statement is so general that it might 

 be applied to any of several species of this genus. It is just this character 

 which led Ehlers (1901, p. 123) to refer some specimens from Ecuador 

 and Peru to this species. A comparison of text and figures of Ehlers dis- 

 closes that this author probably had more than one species, but it is not 

 possible to ascertain whether one, all, or none are the same as D. chiliensis 

 Quatrefages. The most conspicuous discrepancy in Ehlers' description 

 and figures concerns the nature of anterior parapodia, as already suggest- 

 ed by Monro (1933, p. 72). These anterior parapodia were described 

 thus: "Mit einer breit dreieckigen vorderen und zwei hinteren Lippen, 

 die am ersten Ruder gleich lang dreieckig zugespitzt [this might be in- 

 terpreted in either of 2 waj^s — that the 2 postsetal lobes were equally 

 long and not compared with the single presetal lobe, or that the single 

 presetal and the 2 postsetal lobes were all equally long] , an den folgenden 

 ungleich lang sind indem die untere um die Halfte kiirzer als die obere 

 fst." But they are shown otherwise (Ehlers, pi. 15, fig. 3). The pecti- 

 nate setae (designated "meisselformig") were described as having an ob- 

 lique cutting edge with "breiten Haaren," but they are shown with 



