8 LIST OF MARINE MOLLUSCA. [bull. 24. 



cies really belonging' to the fauna in band is described without habitat, 

 or with a wrong habitat, it will not be found in this list from that source. 

 Misprints, unless i)erfectly obvious, are given as they stand. There are 

 a number of local lists, such as those of Schramm, Schomburgk, Shuttle- 

 worth in the Berner Mittheilungen, etc., which have not been accessible. 

 There are others omitted all of whose species are cited in our list from 

 several other sources. Ko attemjDt has been made to ehiborate syn- 

 onymy. This is a task belonging to a later stage of the work. The 

 differences of opinion on that subject also stand in the way of a i)rorapt 

 decision until specimens have been subjected to careful study. The 

 original localities noted in the works cited from have been preserved, 

 but no attempt has been made to give the geographical distribution of 

 each si^ecies. This again waits upon the synonymy. ISTo doubt there 

 are many species existing in the region and described in works on 

 conchology which are omitted. Others will be found under several 

 names in the list. A preliminary study of the fauna indicates that the 

 specific synonymy is very large. The publication of this Ist is designed 

 to assist in improving our knowledge both of the omissions and super- 

 fluities. The deep-sea forms have been included, as there is no doubt 

 a majority of them rise to or originally descended from areas of moder- 

 ate depth or are found in deposits of fossils. The pelngic forms have 

 been included when they occurred, but have not been sought for; they 

 belong to no special coast fauna. The Auriculacea and Petrophila have 

 been included as practically as much marine in habit as Litorinas, though 

 pulmoniferous. Other pulmonata are generally omitted, though a few 

 fresh-water forms inadvertently included have been permitted to re- 

 main. To save space, abbreviations have been used. Those relating to 

 the publication in which a species is enumerated are to be found iu the 

 bibliography, each following the title to which it refers, inclosed between 

 parentheses. A list of abbreviations used for localities follows the 

 bibliography. A dagger (t) after a title signifies that names included in 

 that particular work which have already" been cited from more precise 

 evidence are not extracted for use in the List. This applies chiefly to 

 certain catalogues where most of the species are merely cited by name 

 and without locality. In the List an asterisk (or 'n.s.') after a name 

 indicates that the species is described at the place cited. Not all the 

 descriptions are thus indicated, however, and in some instances cita- 

 tions of plate and figure are not given with the citation of the page, 

 although a figure exists in the work referred to. It was not practicable 

 to correct or supply all omissions of this character in the proofs. Those 

 who have read proof of such matter will be disposed to deal charitably 

 with errors overlooked by the writer in examining more than thirteen 

 thousand entries. Corrections and additions will be thankfuHy re- 

 ceived and hereafter acknowledged on a proper occasion. 

 Washington, July 1, 1885. 



(8) 



