618 PROCEEDINGS OF THE ACADEMY OF [DeC, 



THE LAND AND FRESH- WATER MOLLUSKS OF THE STANFORD EXPEDITION 

 TO BRAZIL. 



BY FRED BAKER, M.D. 



It was my good fortune to accompany the Stanford Expedition 

 to Brazil, Dr. J. C. Branner, Director, in the smnmer of 1911, and I 

 have been requested by Dr. Branner to report on the land and fresh- 

 water mollusks. For apparently good reasons, the report on the 

 marine mollusks will occupy a later paper. 



Mollusks were taken at nearly all points visited by the members 

 of the Expedition, and a large number were sent to me after my 

 return to the United States by the Goeldi Museum of the cit}' of 

 Para, through the kindness of the Acting Director, Dr. Emilia 

 Snethlage, and from the Museu Rocha in the city of Ceara, through 

 the kindness of Mr. Francisco Dias da Rocha, who owns this museum 

 and who deserves great credit for his scientific spirit and untiring 

 work in bringing together this very valuable collection. I beg to 

 acknowledge this great courtesy, as well as the assistance rendered 

 to me personally and to the other members of the Expedition during 

 our stay in Para and Ceara by these well-known Brazilian naturalists. 



After about four months spent in northeastern Brazil, six members 

 of the Expedition returned to the United States, leaving Mr. W. M. 

 Mann and the writer. We made the trip up the Amazon and Rio 

 Negro to Manaos. There we met Mr. R. H. May, of the contracting 

 firm of May, Jekyll & Randolph, who were then completing the 

 Madeira-Mamore R. R. around the falls of the Madeira and Mamore 

 Rivers, to give access to the rich rubber country on the navigable 

 waters of the tributaries of the Madeira River system and to furnish 

 a feasible route into Bolivia from the north. On his invitation, 

 we went aboard one of their steamers clown to Itacoatiara, below 

 the mouth of the Madeira River, thence up the Madeira to Porto 

 Velho, the starting point of the railroad. At this point we were 

 tendered all the facilities of the road and we were the guests of the 

 contractors for about two months, travelling over the whole line to 

 the Guajara-Assu Falls, the upper falls of the Mamore River, just 

 above which point navigable water is reached and the terminus of 

 the road is to be located. On this portion of the trip we crossed 



