ILLUSTRATIONS OF UNFIGURED TYPES OF SHELLS 

 IN THE COLLECTION OF THE UNITED STATES NA- 

 TIONAL MUSEUM 



By William Healey Dall 



Honorary Curator of Mollnsks, United States National Museum 



In past years it has happened that it had been advisable to print 

 preliminary diagnoses of new species in order that established names 

 might be used in reports, or for other reasons. 



As opportunity offered, drawings were secured of these species and 

 put aside until publication could be made. 



The present paper collects together a large number of these figures. 

 In addition to the figures of types, a few figures of species elsewhere 

 inadequately illustrated, or which are figured in publications diffi- 

 cult of access, have been included. 



The earlier of these draAvings were made by the late Dr. J. C. 

 McConnell, whose work of this kind has never been surpassed. The 

 figures on plate 9, 19 to 26, and a few scattered ones on other plates 

 are by him, and form probably the final publication of any of his 

 work. Plates 1 to 8, 10 to 14, and 17 to 18 are from photographs 

 artistically retouched by Mrs. E. B. Decker. Plates 27 to 36 are 

 chiefly from drawings by ]\Iiss Evelyn Mitchell. Plates 15 and 16 

 are from untouched photographs by Prof. F. W. Kelsey, of San 

 Diego. 



For convenience of reference the species are arranged in alpha- 

 betical order, and an index of genera referred to is supplied. 



A large proportion of the species included are from the northern 

 waters of the Pacific, from the seas about Japan, northward and 

 eastward to the northwest coast of North America. Nearl}^ two 

 hundred species are illustrated, and it is believed the student of 

 these faunas wdll find the paper useful. 



No. 2554.— Proceedings U. S. National Museum. Vol. 66, Art. 17. 



20001 — 25 1 



1 



