THE NAUTILUS. 77 



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 luteseens King and 

 Bulimulus gorritiensis Pils. Near the small town of Maldonado, 

 was found Amphidojca 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, Eusena- 

 da, etc., the only thing noticeable was the extreme abundance of 

 Ampul/aria canaliculate 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 Fe 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 the ship went up the Uruguay River as far as Paysan- 

 du that things began to be interesting, but the time was too limited, 

 This region proved to be extremely rich in undescribed Potamo- 

 llthns. 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 light fore-finger into the collecting basket. The first 

 visit to the water's edge at Paysandu, resulted in finding P. Ruxliii 

 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 Unioiilda;. A trip, by a well-organ- 

 ized party, up the river to its source, would yield valuable results. 

 Only three specimens of Vaglnnlns were found, and these among the 

 ruins of an old hide building in Maldonado. The plain back of 

 Baenos Ayres did nut 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. 



