FISHERY BULLETIN: VOL. 70, NO. 2 



Diagnosis: A large Cho7ie species without 

 ventral shields. Branchial basis hidden by level 

 collar. Approximately 15 pairs of radioles con- 

 nected for two-thirds of length by palmate mem- 

 brane, with free filiform ends of intermediate 

 length. First bundle of setae small, inserted in 

 a furrow (continuation of anterior border of 

 first setiger) on same level as following noto- 

 setae. Conspicuous notocirri and notopodial lips 

 in thorax. Spatulate setae without pointed tips. 

 Anterior abdominal uncini with rostra about as 

 long as bases, few coarse teeth in two columns; 

 crowns somewhat enlarged in posterior seg- 

 ments. 



Material studied: Tomales Bay, Calif., near 

 the low tide line. Summer 1941. Collected by 

 F. A. Pitelka; identified by 0. Hartman. AHF 

 n 424, 2 specimens. 



Tomales Bay, Calif., clam flats. 8 June 1941. 

 Collected by S. F. Light; identified by 0. Hart- 

 man. AHF 003258, 2 specimens. 



Off Long Beach, Calif., Velero station 4886, 

 lat 32°42'34"N, long 118°08'15"W, 22 Feb. 1957. 

 AHF 003218, 6 specimens. 



Inner Tomales Bay, Calif., across from the 

 village of Marconi. Coarse intertidal sand. Col- 

 lected and identified by J. S. Tucker. 6 speci- 

 mens. 



Additions to the Description: The largest 

 animals (AHF 003258) are up to 5 cm long (to- 

 tal) and 3 mm wide. The ends of their radioles 

 have flanges (Figure 3a) that taper fairly 

 abruptly at the level of the last pinnules. In 

 specimens from Tomales Bay of 3-cm length and 

 2-mm width, the free ends may be almost twice 

 as long as shown in the figure. The largest of 

 the several ventral nude filaments recognizable 

 in the latter specimens reach two-thirds of the 

 length of the branchial crown. 



The anterior end is distinguished ventrally by 

 a very prominent first (buccal) segment (Fig- 

 ure 3b) that is clearly set off" from the collar 

 and tends to be split longitudinally. The anteri- 

 or border of the first setiger is complete; lat- 

 erally, it converges with the anterior border of 

 the second setiger where the first bundle of setae 

 inserts (Figure 3c). The furrow between the 



first and the second setiger extends to the fecal 

 groove. The segments may appear as biannulate 

 at least through the 25th abdominal setiger. 



The thoracic notopodia (Figure 3d) have mas- 

 sive lips. The posterior lips bear more or less 

 contracted notocirri. The whole structure may 

 be almost completely withdrawn into the sur- 

 rounding epidermal pocket so that only the con- 

 tracted cirrus, resembling a papilla, is visible 

 under favorable illumination. The bayonet-type 

 setae (Figure 3e) arise from the anterior lower 

 lip shown in Figure 3d. The diameter of their 

 shafts is three-fourths the width of the spatulate 

 setae. They taper abruptly at about the level 

 of the body surface. Spatulate setae (described 

 by Hartman, 1944b, as having a dimple) some- 

 times have very minute tips (Figure 3f) which 

 presumably are usually broken oflf. Thoracic 

 uncini may or may not be arranged in irregular 

 double rows. The anterior abdominal uncini 

 (Figure 3g; cf. Bush, 1904, Plate 35, Figure 28; 

 Hartman, 1942b, Figure 141; 1944b, Plate 23, 

 Figure 49) have small and few teeth, in two col- 

 umns. Posteriorly, however, the number of 

 rows increases (Figure 3h) as well as the num- 

 ber of columns. 



In stained specimens, the entire epidermis is 

 uniformly green, i.e., ventral shields are absent. 

 A white crescent-shaped area is found ventrally 

 on the collar anterior to the first segment. The 

 intrasegmental furrows, dorsally in the thorax, 

 are inclined rearwards as in C. magna (cf. Fig- 

 ure 5e). 



CHONE GRACILIS MOORE 



Figure 4 



CHONE GRACILIS Moore, 1906, p. 257.- ?Hart- 

 man, 1961, p. 42; 1969, p. 665 (same record). 



not CHONE GRACILIS Moore.- Berkeley and 

 Berkeley, 1932, p. 315; 1942, p. 206; 1952, 

 p. 123, in part (for all, see C. ecaudata). 



not CHONE GRACILIS Hofsommer, 1913. 

 p. 342 (homonym). 



CHONE INFUNDIBULIFORMIS.- Pettibone, 

 1954, p. 378, in part. 



Diagnosis: A Chone species of intermediate 

 size without ventral shields. Ten pairs of ra- 



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