BANSE: REDESCRIPTIONS OF SOME SPECIES OF CllONE AND EUCHONE 



Material studied: Holotype, from almost 

 500-m depth off California. USNM 17281. 



North of Santa Catalina Island, Calif., Velero 

 station 1178, between lat 33°30'45"N, long 118° 

 30'40"W,andlat33°27'40"N, long 118°30'00"W, 

 72 to 78 m, sand, 10 Sept. 1940. Identified by 

 0. Hartman. AHF 003259, 1 specimen. 



OflF Upright Head, Lopez Island, Wash., ap- 

 prox. lat 48°35.5'N, long 122°53'W, 2 Aug. 1960. 

 Collected by R. P. Dales and G. John. FHL 298, 

 1 specimen. New record. 



South of Orcas Island, Wash., lat 48°34.9'N, 

 long 122°50.8'W, 40 to 54 m, 13 Aug. 1964. Col- 

 lected by S. van Niel. USNM 43636, 1 specimen. 

 New record. 



Additions to the Description: The two large 

 complete animals from the San Juan Islands, 

 Wash., were compared with the holotype. The 

 slightly larger one (FHL) has about 65 abdom- 

 inal setigers and is approximately 7.5 cm long 

 (total) and 0.5 cm wide. The trunk of the Cal- 

 ifornian specimen (AHF) is slightly longer than 

 2.5 cm. 



The branchial crown, previously unknown, 

 contributes about one-fourth of the total length. 

 The larger specimen has 30 pairs of radioles; in 

 addition, about six pairs of nude filaments max- 

 imally one-fifth as long as the branchial crown 

 are present. The palmate membrane connects 

 three-fifths of the length of the radioles. Their 

 free ends (Figure 5a) are 3 to 5 mm long and 

 sometimes coiled up like a watch spring. The 

 very numerous pinnules are about 1.5 mm long. 



The collar (Figures 5b and 5c), well recog- 

 nizable also in the holotype, is large for a species 

 of Cho7ie, markedly higher ventrally than dor- 

 sally and often opened and folded backward. 

 When closed, it probably conceals fully the com- 

 mon basis of the radioles. The dorsal slit ex- 

 tenas to the middle of the second setiger (Fig- 

 ure 5b). The first setiger is indistinctly set off 

 from the first segment; the border is morpho- 

 logically visible but is not indicated by a white 

 line after staining (Figures 5c and 5d). The 

 setae on the first setiger arise in a more ventral 

 position than the notosetae on the following seg- 

 ments (Figure 5c). 



Additions to Moore's description of the trunk 



are the following: A glandular postsetal girdle 

 is present on the second setiger. The intraseg- 

 mental furrows in the middle and posterior thor- 

 ax are not parallel to the intersegmental furrows 

 ( Figure 5e) . Ventral shields are absent, i.e., the 

 epidermis is completely glandularized and stains 

 uniformly in the thorax and most of the abdo- 

 men, except for the inter- and intrasegmental 

 furrows (Figure 5d). 



Bayonet-type setae are present. The spatulate 

 setae of the holotype, (stated by Moore, 1923, 

 to be without a mucron) are lost and those of the 

 Californian specimen are damaged. The spatu- 

 late setae of the material from Washington have 

 hairs on their tips (Figure 5f). The thoracic 

 uncini tend to be arranged in irregular double 

 rows in the large animals. Anterior and pos- 

 terior abdominal uncini (Figures 5g-i) have 

 beaks longer than the bases, with three or four 

 coarse accessory teeth above them. In frontal 

 view, the teeth appear to be in a single row in 

 most cases; occasionally I have seen two side 

 by side. The difference in outline between Fig- 

 ures 5h and 5i is probably more a question of 

 orientation than real. 



Remarks: Euchone magna was transferred 

 to Chone by Hartman (1969). It seems likely 

 that Moore (1923) placed the species in Euchone 

 due to a mistake while reconstructing his lost 

 manuscript of 1911: His text states clearly the 

 absence of a caudal membrane. Also, the vial 

 contains a provisional label, Chone magna, which 

 is written on stationery of the Philadelphia 

 Academy and, according to Dr. M. H. Pettibone, 

 is in Moore's handwriting. 



The species has been known previously only 

 from California. 



CHONE ECAUDATA (MOORE) 



Figure 6 



JASMINIERA EC A UDATA Moore, 1923, p. 246. 

 CHONE ECAUDATA.- Hartman, 1942a, p. 135; 



1969, p. 663.- Berkeley and Berkeley, 1950, 



p. 67; 1952, p. 124. 

 CHONE GRACILIS.- Berkeley and Berkeley, 



1932, p. 315; 1942, p. 206; 1952, p. 123, in 



part. 



473 



