420 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Hooded hooks are angled proximally, the shaft turned abruptly 

 back near the base. On the back of the hook the node is sharp. The hood 

 is short but spacious. The beak is long, slender and surmounted by 5 

 well separated teeth in a slightly crescentic row (pi. 46, fig. 1). The 

 fibrillations of the core are widely spaced and extend to the base of the 

 hook. 



Distribution. — Notomastus (Clistomastus) lineatus has been previ- 

 ously recorded from British Columbia (Berkeley, 1932, p. 675). The 

 present record is from Newport Bay, southern California, from muddy 

 flats at low tide line. These are the only known records from the 

 Western Hemisphere. 



Notomastus (Clistomastus) tenuis Moore 



Plate 47, Figs. 1-5 

 Notomastus tenuis Moore, 1909, pp. 277-278, pi. 9, fig. 55. 

 Notomastus angulatus Chamberlain, 1919b, pp. 16-17; Berkeley, 1929, 



p. 312; MacGinitie, 1935, p. 694. 

 Eisigella tenuis Berkeley, 1942, p. 198. 



Collections.— 903-3^ (7) ; 905-38 (5); 1211-40 (2); 1368-41 (1); 

 1441-41 (many); 1443-41 (3); 1445-42 (1); 1447-42 (many); 1450- 

 42 (6); 1451-42 (2); 1457-42 (several); 1472-42 (1); 1492-42 (5); 

 many others from central and southern California from intertidal areas. 



The body is long, slender and appears nodular in its posterior ex- 

 tremity because of the elevated notopodia (pi. 47, fig. 5). The thorax 

 is weakly areolated through its anterior half but smooth thereafter. A 

 shallow longitudinal groove extends along the sides of the thorax (pi. 47, 

 fig. 1). The prostomium is depressed conical; it has a pair of elongate, 

 pigmented ocular areas at the posterior margin in front of the nuchal 

 slits ; each area consists of 15 to 20 spots. The proboscis is coarsely papil- 

 lated proximally but smooth and epithelial distally. The first visible 

 segment is apodous and achaetous ; it is about one and one-third times as 

 long as the next segment (pi. 47, fig. 1 ). 



The first setigerous segment has notopodia but neuropodia are absent. 

 The next 10 segments have notosetal and neurosetal fascicles of slender, 

 pointed setae. The peristomial ring and the next 7 segments are weakly 

 areolated (pi. 47, fig. 1). 



Lateral organs are small; each is visible as a tiny papilla between 

 the parts of a parapodium but nearer the notopodium; they are present 

 throughout thoracic and abdominal segments. There are no branchiae 



