. Annali della Accademia delle Scienze di New York. La scienza. :528 Annals New York Academy of Sciences ruscelli stand ad alti angoli. Questa condizione instabile sembra essere dovuto alla elevazione delle Ande durante un tardo periodo geologico. La pioggia pesante, a volte per un importo pari a quattro o cinque pollici entro poche ore, produce le inondazioni di immenso volume. Questi andare giù di carica il can- yons timorosi con furore e a volte sembra che nulla poteva sopportare la loro energia di spazzamento. Tuttavia queste acque turbolenti sono l'habitat di pesci così meravigliosamente adattate al loro ambiente che essi sono in grado

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. Annals of the New York Academy of Sciences. Science. :528 ANNALS NEW YORK ACADEMY OF SCIENCES streams stand at high angles. This unstable condition seems to be due to the elevation of the Andes during a late geological period. The heavy rainfall, at times amounting to four or five inches within a few hours, produces floods of immense volume. These go charging down the can- yons with fearful fury, and at times it would appear that nothing could withstand their sweeping energy. Yet these turbulent waters are the habitat of fishes so wonderfully adapted to their surroundings that they are able to grow and to multiply in great numbers. In external appearance they resemble the catfish or horned pout of the north. The skin is smooth and scaleless. The color is a dark mottled gray shading into a slightly yellowish tint on the posterior parts. They rarely attain a length greater than twelve inches. As an article of food. Fig. 1.—Arges marmoratus Regan ; side view they are esteemed by the natives and are well known by the local name "Capitan." They have lately been described by C. Tate Began as Arges marmoratus.1 Under usual conditions they are clumsy and awkward swimmers, wrig- gling through the water like tadpoles, but as creepers and climbers they are without rival in the fish family. The mouth is small, but is sur- rounded by a broad, soft, rubber-like flap, very thin and flexible at the edges (Fig. 2). It is a sucker mouth and the entire mechanism is so perfectly adapted to the needs of the fish that it finds no difficulty in firmly attaching itself to any convenient object. It is this ability to make a quick anchorage that enables the fish to stay at home when nature seems bent upon sweeping the canyons and water-courses clear of every- thing movable. If, however, these fish were able only to keep themselves from being washed out in flood times, they would be insufficiently equipped to main- tain an existence in these mountain streams. If they depended up

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• bookcentury1800
• bookdecade1870
• booksubjectscience
• bookyear1877