. Bulletin of the Natural History Museum Zoology. 14 ALLEN, SANDERS AND F. HANNAH be Y. lucida from the North West Atlantic and two closely related north-east Atlantic species (Yoldiella iris and Yoldi- ella inflata). We have examined material from the Zoological Museum, Copenhagen, specimens identified by Verrill & Bush, the Jeffreys collections in London and Washington and Scandinavian material from a variety of sources which includes specimens identified by Dr. Kurt Ockelmann in his study of Greenland material. To prevent even more confusion we accept as our baseline that spec
. Bulletin of the Natural History Museum Zoology. 14 ALLEN, SANDERS AND F. HANNAH be Y. lucida from the North West Atlantic and two closely related north-east Atlantic species (Yoldiella iris and Yoldi- ella inflata). We have examined material from the Zoological Museum, Copenhagen, specimens identified by Verrill & Bush, the Jeffreys collections in London and Washington and Scandinavian material from a variety of sources which includes specimens identified by Dr. Kurt Ockelmann in his study of Greenland material. To prevent even more confusion we accept as our baseline that specimens from Eastern Arctic and northern temperate shallow water populations of the east Atlantic adja- cent to the type locality and which are described in the earliest accounts, as Yoldiella lucida We have also examined West Atlantic material some of which was misidentified and which we recognize as Y. lucida namely:- MCZ No. 137266 labelled Yoldiella inflata, S. Block Island, 180- 190 m. MCZ No. 227737 labelled Yoldiella lucida V & B, off Bradlees Bank, 120 m. MCZ No. 159722 (unlabelled). MCZ No. 202847 (which includes specimens from a num- ber of Stations mixed together). MCZ No. 78292 labelled Sta. 2697, off Halifax , 377 m. USNM No. 73172 labelled Y. lucida, 200 m. USNM No. 202847 labelled Gulf of Maine. Mixture from several stations. Specimens misidentified as Y. iris in the National Museum, but which are clearly Y. lucida :- USNM No. 74517 labelled Gulf of Maine, 172 m. USNM No. 159717 labelled Gulf of Maine, 40m. USNM No. 159718 labelled Gulf of Maine, 134 m. Samples of Y. lucida from the Skaggerak, loaned by the University Museum, Copenhagen, agree well with the figure of Sars (1878) and which Locard (1898) considered as the type (Fig. 1). These are also very similar to the shallow water, North American specimens referred to as Y. lucida and Y. iris by Verrill & Bush (1898). These latter specimens are very slightly more inflated but other
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