no.1704. A COLLECTION OF SHELLS FROM PERU—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. J 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. 8. Bureau of 
Fisheries steamer Albatross seems to have avoided shallow water; 
and in the case of Dentaliwm, 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 Auriculidee 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 political 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 
