3 o4 DISCOVERY REPORTS 



figured without any statement of the origin of the figured specimen. The British 

 Museum Catalogue (1852 and 1854) has given especial difficulty in this way. There is 

 in the Museum a series of slides, received in 1854 and known as the " British Museum 

 Catalogue Collection ", but only a small part of the specimens mentioned in the catalogue 

 is represented in this collection, and the rest have been regarded as missing or un- 

 recognizable. The drawings show that the catalogue was, as its name implies, chiefly 

 based on specimens already in the Museum, including the Johnston collection (cata- 

 logued by Gray, 1848), whose registered numbers are given on many of the drawings. 

 The slides received in 1854 are specimens from Busk's own collection which he included 

 in the catalogue and deposited in the Museum on its publication. 



As to the Challenger Reports, the series of mounted and unmounted specimens 

 received by the British Museum in 1887 and known as the "Challenger Collection" is 

 almost complete in so far as specimens of each species from nearly every station at 

 which it was recorded are present, but a large number of preparations from this 

 material were kept by Busk and did not come to the Museum till his whole collection 

 came in 1899. It has generally been assumed that the type and figured specimens were 

 to be found among those deposited in 1887, but it is now known that there are some 

 figured and otherwise important Challenger specimens in the 1899 collection. 



The work of tracing the figured specimens and preparing a new set of more detailed 

 explanations of Busk's figures is in progress. In the meantime some of the information 

 has been used to solve the problems of the present report. 



ACKNOWLEDGEMENTS 



I am very grateful to Dr Thiel and Professor Bassler for the loans of unnamed 

 material from the Hamburg and U.S. National Museums respectively, and for the 

 exchange arrangements by which we have kept some of the material ; to Dr Thiel for 

 lending me some of Calvet's type specimens; to the Manchester Museum for frequent 

 loans of type and other specimens from the Waters Collection ; to Mr A. A. Livingstone, 

 Professor Ernst Marcus, Professor C. H. O'Donoghue and Professor R. C. Osburn, 

 who have all lent specimens of their own, and to Dr Sixten Bock for lending specimens 

 from the Riksmuseum, Stockholm ; to the Discovery Staff, most of whom have at one 

 time or another given me the benefit of their special knowledge of the problems before 

 me, particularly over questions of distribution and hydrology; to the Director of the 

 Scott Polar Research Institute, Cambridge, for the facilities afforded me for consulting 

 various documents, including notes made by Mr Hodgson, naturalist to the National 

 Antarctic Expedition ; to Mr W. A. Smith, from whom I have constantly received very 

 reliable help, particularly in listing and sorting collections and checking manuscript 

 and proofs; to Mr M. G. Sawyers for his careful and skilful photography; to Miss E. C. 

 Humphreys for the clearness and accuracy of the maps; to Sir Sidney Harmer for 

 opportunities of consulting his catalogue and for his interest and help throughout my 

 work ; and to Dr N. A. Mackintosh for his patience over my unavoidable delays with 

 the proofs. 



