localities as Arica and Africa. " Lumping " closely re- 

 lated 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, 



disentangle such cases and use only the name definitely 

 belonging to the Pacific form. In making her dredgings 

 the U. S. Fish Commission 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. Xo other deep-water species, however, has 

 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 look out for analogous cases. Species of 

 Auriculidae which are exclusively littoral, although pul- 

 monate, 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 minuter 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 sub- 

 faunas, but it is too early to speculate about this possible 

 feature of the distribution. 



I have indicated in the preceding remark, the nature 

 of the reservations 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. 



