290 Annals of the Carnegie Museum. 



3. The abundance of molluscs in certain regions. 



Journey No. 4. To the Rio Ribeira da Iguape. November to 

 December iq, igo8. 



From Rio de Janeiro I went down the coast to Iguape. I then 

 ascended the Rio Ribeira da Iguape in boats and canoes as far as 

 Iporanga and walked over some of the outliers of the Serra do Mar 

 to Agua Quente, near which point I explored a cave called Caverna 

 das Areas. In this cave I collected several specimens of a blind 

 catfish, which previously had been taken by Ricardo Krone of Iguape. 

 I also caught six specimens of Aglea intermedia, a crab with reduced 

 eyes. The chief results of this trip were: 



1. The collection of the two interesting species found in the Caverna 

 das Areas. 



2. The securing of a large number of species not previously reported 

 from the Ribeira basin. 



3. The observation of the excessive development of mailed cat- 

 fishes in the Ribeira. 



4. The determination of the great similarity of the fishes of the 

 Ribeira to those of the upper Rio Parana. 



Journey No. 5. To the Rio Igiiassu. From December 20, IQ08, 

 to the middle of January, igog. 



From Iguape I went to Paranagua and over the Serra do Mar to 

 the Iguassu basin. The chief results of this trip were: 



1. The observation of the paucity of fishes and other forms of life 

 in the Rio Iguassu. 



2. Nearly all of the fishes are new species. 



3. Fishes cannot ascend the large falls of the Iguassu. 



4. I infer that the Iguassu basin is far older than any of the aquatic 

 forms which inhabit the Parana basin. 



Journey No. 6. Rio Grande do Sul to Montevideo. From the 

 middle of January to February 17, igog. 



I sailed down the coast to Porto Alegre and worked my way over 

 to the Uruguay River and thence to Montevideo. The chief results 

 of this trip were: 



1. The large number of species of fishes, molluscs, and Crustacea, 

 which I obtained from this part of South America. 



2. The determination of the absence of any connection which will 

 allow an easy intermingling of the forms of the Rio Grande do Sul 

 with those of the La Plata basin. 



