56 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



few setigers are provided with hooded hooks and limbate setae, the latter 

 continue through 17 to 20 setigers in the inferior part of the fascicle, but 

 from the eighteenth to twenty-first setiger they are replaced by subacicu- 

 lar hooks. The hooded hooks (pi. 1, fig. 15) of the first few setigers are 

 more strongly cui-ved distally than similar hooks in D. cuprea (above), 

 and the accessory tooth is set at nearly a right angle to the shaft. The 

 subacicular hooks, present from about the twenty-first setiger, are pro- 

 longed in their major tooth and directed upward (pi. 1, fig. 19). Pecti- 

 nate setae tend to be cupped at the sides, in their flaring ends, as originally 

 shown by Moore (1911), but when pressed flat (pi. 1, fig. 18) are seen 

 to have numerous (over 20) fine teeth. 



The proboscidial armature of a younger individual (coll. 1206-40) 

 is shown in pi. 1, figs. 16, 20; mandibles are free from one another 

 through most of their length and have a characteristic cutting edge, with 

 a deep indentation (pi. 1, fig. 16). The maxillary formula on the left 

 side is about 1-8-7-5 or 6-1, and on the right side about 1-10-7-1 (pi. 1, 

 fig. 20). As in other species of onuphids, there is individual variation. 



D. ornata resembles D. cuprea in many respects, but differs at least 

 in the following: the teeth in anterior hooded hooks are more strongly 

 curved, the subacicular hooks have a longer major tooth which is di- 

 rected upward at its distal end, the papillation of the tentacular styles 

 dififers, and the presetal lobe of anterior parapodia is less oblique, more 

 truncate. 



Distribution. — D. ornata is typically a southern Californian species, 

 and occurs south to Thurloe and Rosario bays. Lower California, from 

 the intertidal zones to depths of 34 fms. 



Diopatra splendidissima Kinberg 

 Plate 1, Figs. 21-23 



Kinberg, 1857, p. 39; 1910, p. 39, fig. 7; Monro, 1928, pp. 89-90, fig. 13. 

 D. calif ornica Moore, 1904, pp. 484-487, pi. 37, figs. 1-9. 



Collections.— 6\6-36 (1); 898-38 (3); 1441-41 (many); 1446-42 

 (1); 3823 Burch, San Pedro, California, in 10 fms. (4); Anaheim 

 Slough, California, shore (coll. H. Crosby) (1); southern California, 

 shore (several) ; Tomales Bay, California, shore (several). 



The dorsum is almost uniformly dark brown (coll. 888-38) or paler, 

 perhaps because faded. Frontal antennae are covered over with low, 

 coarse papillae. The styles of the occipital tentacles appear finely lined ; 

 they are covered with fine longitudinal rows of papillae, consisting of a 

 very delicate, straight row alternating with another regular row of 



