THE NAUTILUS. (rg 
small peninsula opposite the main city, and from which Montevideo, 
“The mount, I see,” derives its name, contained nothing special, 
but the plain back of it yielded several land species, and the small 
runs and creeks many fresh water forms, in some of which, when 
dry, the whole bottom was found to be covered with dead Planorbis. 
Maldonado Bay is about 20 miles nearer the sea, in Uruguay, and 
was the only place in which the dredge was used with good results 
as showing the extreme southern limit of several West Indian spe- 
cies. Gorriti Island, in that bay, was a treasure for H. lactea, and 
was abundantly supplied with Strophochilus lutescens Wing and 
Bulimulus gorritiensis Pils. Near the small town of Maldonado, 
was found Amphidoxa costellata D’Orb. in a small grove of native 
trees, about the only one met with. Most of the trees of any size in 
the immediate neighborhood of Montevideo and Buenos Ayres, are 
the introduced eucalyptus. Upon the visit to Buenos Ayres, Ensena- 
da, etc., the only thing noticeable was the extreme abundance of 
Ampullaria canaliculata Lam. and its varieties, in all stages of 
growth from the egg upward. The Rio Parana, upon which the 
ship went as far as Rosario in Santa Fé province, did not yield 
much, principally for the reason that the ship was there during a 
revolution, when excursions always have an element of danger, as all 
the hoodlums of the town are turned loose with Winfield rifles. It 
was only when theship went up the Uruguay River as far as Paysan- 
du that things began to be interesting, but the time was tvo limited, 
This region proved to be extremely. rich in undescribed Potamo- 
lithus. The collecting was easy, as all that was required was to 
pick up any stone at extreme low water and scrape the specimens 
off with the right fore-finger into the collecting basket. The first 
visit to the water’s edge at Paysandu, resulted in finding P. Rushii 
Pils., which was found to be unfigured in D’Orbigny, and so few in 
number that one or two trips more were taken especially to find 
them, but only with limited results, so it can be considered scarce. 
Nearly all the other forms were abundant. The means of living 
there are so easy that it was found a hard matter even to hire the 
amphibian small boy to collect Unionide. <A trip, by a well-organ- 
ized party, up the river to its source, would yield valuable results. 
Only three specimens of Vaginulus were found, and these among the 
ruins of an old hide building in Maldonado. The plain back of 
Buenos Ayres did not yield such an abundant supply as one would 
expect from D’Orbigny’s remarks, but possibly that was owing to 
the extreme dryness of the season while we were there, 
