5 Abdominal neuropodia with obvious straplike branchiae 



5' Abdominal neuropodia with small superior branchial lobes . . . . 



6 All thoracic neuropodia with capillaries; formula: 



lie 



P + ■;; 77—7 = 12. Abdominal hooks with a single arc of 



+ IOC 



5 to 6 denticles above main fang 



6' Last thoracic neuropodium with hooks; formula: 



P + -— = 12. Hooks with two arcs of 4 and 2 



+ 9C + IH 

 denticles above main fang 



7 Peristome followed by V.] thoracic setigers bearing capillai'ies; 



formula: P + ' = 14. Abdominal neuropodia with retrac- 



tile gill filaments (DasybnuicluiK) 



7' Peristome followed by 14-1.5 thoracic setigers; formula: 



P +— ; \^^!^]'}^^ = 15-16. Abdominal 



(CorO) + (ll('-l;]C) + IH or2H 

 neuropodia without gills (LvidvupitcUu) 



8 Neuropodial gills with about ."^0 filaments j . . 



8' NeurojKjdial gills with few filaments 



A^ lobatiis 

 N. latericeua 



N. he mi pod /IS 



N. am erica mix 



L. glabra 



D. hi nibricoidrs 

 D. Iiniiilatiia 



Capifella capitata (Fabricius. 1780) 



Capiti 11(1 cajiitatii. - Fauvel, 1927: 154, Fig. 55 

 a-h.-Hartman, 1947a: 404, pi. 43: Fig. 1.2.- 

 Day. 1967: 595, Fig. 28.2. i-m. 



Rcciirds. — Beaufort Sound, intertidal and 

 dredged in muddy sand (11, 1:5, 15, 18, *). 



Distribiitiiin. — Cosmopolitan in black mud of 

 estuaries and protected harbors from to 80 m. 



Mediomostus californiensis Hartman. 1944 



Mcdidiinistiis ralifdi-iiiiiisis Hartman, 1947a: 

 408, pi. 46: Fig. 3, 4; 1969: 387, Fig. 1-4. 



Records. — Common off Beaufort in 10-20 m 

 (20,21, *). 



Distribution. — California; intertidal and es- 

 tuarine. 



Description. — Body about 20 mm long. Pro- 

 stomium bluntly conical with ventral eyespots. 

 Thorax including an achaetous peristome and 

 12 setigerous segments with capillary setae in 

 both rami. Abdomen of numerous thin-walled 

 segments with fu.sed notopodial tori and noto- 

 podial hook-rows continuous across middorsal 

 line. Interramal organs as prominent papillae 

 between notopodia and neuropodia from last 

 thoracic segment onwards. Abdominal neuro- 

 podia with a small superior branchial lobe and 

 long rows of hooks almost meeting on mid- 

 ventral line. Individual hooks (Figure 13j, k) 

 with short hoods and a crest of seven to nine 

 subequal denticles above main fang. 



Records. — Four specimens off Beaufort in 

 160 m (*). 



Distribution. — British Columbia and Cali- 

 fornia; intertidal to 89 m. 



Leiochrides pallidior (Chamberlin, 1918) 



FiKure l.'5j, k 



Leiochrides paUidiorWartman. 1947a: 429; 1969: 

 383. 



Heteromastus filiformis (Claparede. 1864) 



Heteroniastiis filiformis. - Fauvel, 1927: 150, 

 Fig. 53 a-i. - Hartman, 1947a: 427, pi. 52: 

 Fig. 1-4; 1969: 377, Fig. 1-5. - Day, 1967: 

 601, Fig. 28.3. a-d. 



99 



