FISHERY BULLETIN: VOL. 70, NO. 2 



than one-third of the total leng-th, with the form 

 of the tips of the radioles and spatulate setae, 

 the insertion of the collar dorsal on the second 

 setiger, and the form of the abdominal uncini. 



The species is definitely known from south- 

 western Alaska. Hartman (1961,1969) record- 

 ed it from California but referred expressly to 

 the description by Berkeley and Berkeley 

 (1952). As this largely represents C. ecaudata 

 (see p. 473), the record needs confirmation, 



CHONE MAGNA (MOORE) 



Figure 5 



EU CHONE MAGNA Moore, 1923, p. 245.- Hart- 



man, 1961, p. 42. 

 CHONE MAGNA.- Hartman, 1969, p. 669. 



Diagnosis: A large Chone species without 

 ventral shields. Branchial basis shorter than 

 oblique collar. About 30 pairs of radioles, con- 

 nected for two-thirds of their length by palmate 

 membrane, with free ends narrow and very long. 

 First bundle of thoracic setae small, inserted 

 slightly ventrad to following notsetae. Spatulate 

 seta without pointed tips. Abdominal uncini 

 uniform, with three of four coarse accessory 

 teeth in two columns ; rostra extending beyond 

 bases. 



Figure 5. — Chone magna; e, g, and h from holotype, the others from animals from Wash- 

 ington: a, end of radiole; b, c, ventral and side views of anterior end, branchial crown 

 omitted, setae schematic; d, ventral view of anterior end of stained specimen, body outline 

 schematic; e, dorsal view of posterior thoracic segment of stained specimen; f, spatulate 

 seta; g, h, uncini from 30th and approximately 70th (last of fragment) abdominal seg- 

 ments; i, uncinus from 70th (10th before last) abdominal segments from other animal. 



472 



