NO. 1704. A COLLECTION OF SHELLS FROM PERV—DALL. 189 



species as obviously exotic, but a small number remain which are 

 doubtful and which are indicated by the name (Tschudi) as needing 

 confirmation. I have also omitted a few names which seemed to be 

 almost certainly due to misidentification or to a confusion between 

 such localities as Arica and Africa. ''Lumping" closely related 

 species, such as some of the Siphonarias, has led certain authors to 

 include purely Atlantic forms with their Pacific analogues under one 

 name. So far as time and the access to specimens permitted, I have 

 tried to disentangle such cases and use only the name belonging to 

 the Pacific form. In making her dredgings the U. S. Bureau of 

 Fisheries steamer Albatross seems to have avoided shallow water; 

 and in the case of Dentalium, which has a wide range in depth, I have 

 included a few species actually dredged beyond the 100-fathom line, 

 but which will in all probability be found within it when sought for. 

 No other deep-water species, however, have been admitted. An 

 account of them will be found in my Albatross report of 1908. In 

 scanning the list those unfamiliar with the repetition of names so 

 prevalent in Spanish geographical nomenclature will need to remem- 

 ber that there is a Tumbes in Chile as well as in Peru, and be on the 

 lookout for analogous cases. Species of Auriculidse which are 

 exclusively littoral although pulmonate have been included, also the 

 salt-water Cyrenas, my aim being to include all species which are 

 to be found along the shores of the province, on the beaches, and in 

 the adjacent waters of the sea. Whatever deductions from the list 

 may be necessary hereafter, I am convinced that they will be more 

 than made up for by future additions from the ranks of the minute 

 species. 



It is probable, though not by any means certain, that when we 

 eliminate the overflow from the Panamic and Magellanic provinces 

 the remaining fauna on this long stretch of coast may be susceptible 

 of division into subfaunas, but it is too early to speculate about this 

 possible feature of the distribution. 



I have indicated in the preceding remarks the nature of the reser- 

 vations which must be made in discussing the statistics of our present 

 census of the Peruvian fauna, and subject to those reservations we 

 may now proceed to consider the figures. 



The total number of species appears to be 869, of which 64 are 

 pelagic and may be omitted from consideration in the matter of 

 distribution, leaving 805. Taking the present political limits of the 

 two countries as a starting point, we find 71 species reported from 

 Peru exclusively, and 103 restricted to Chile. But as pohtical and 

 biological boundaries rarely have anything in common, these data 

 are not especially significant. We have 174 species restricted to 

 Peru or Chile, and 141 common to Peru and Chile, making 315 

 species proper to the province itself. In addition to these we have 



