Report of the Naval committee to the House of representatives, August, 1850, in favor of the establishment of a line of mail steamships to the western coast of Africa, and thence via the Mediterranean to London; . bout the base of the plateau looked broken and jagged, asthough a tremendous explosion had taken place. Molluscan life was here quite abundant, and I was for-tunate enough to discover a new species of Potamopyigus, which Mr. H. A Pilsbryhas called P. Bakeri inhonor of its was found in the littleriver which runs throughthe town. Such formsas Pupa servilis, P Con-tracta,
Report of the Naval committee to the House of representatives, August, 1850, in favor of the establishment of a line of mail steamships to the western coast of Africa, and thence via the Mediterranean to London; . bout the base of the plateau looked broken and jagged, asthough a tremendous explosion had taken place. Molluscan life was here quite abundant, and I was for-tunate enough to discover a new species of Potamopyigus, which Mr. H. A Pilsbryhas called P. Bakeri inhonor of its was found in the littleriver which runs throughthe town. Such formsas Pupa servilis, P Con-tracta, Stenopus elegans,Platiorbis parvus, andPhysa osculans werequite numerous. Birdswere not numerous. POTAMOPYKGUS BAKEKI, PILSBRY. The town was built upon Cretaceous limestone, andseveral mountain ridges could be seen to the whole plateau, and the numerous small cones in theneighborhood, seemed to have been thrust up through thisdeposit. At the bridge crossing the river a curious factwas observed; the rock on the left bank was composed o^limestone, while that on the opposite side was composedof lava, the river flowing between the two deposits. At night we had a concert of fiogs, which made most. DRAINAGE OF MEXICO. 129 extraordinary noises. There were three kinds, whicli couldfrequently all be heard at once. One of these made anoise something like what one would expect a frog tomake, namely, a dismal croak, but the sounds uttered bythe others were like no sound I ever heard an animal makebefore. A distant railway-train approaching, and a black-smith hammering on an anvil, were the only noises withwhich I could compare them. Two days were spent in this interesting town, when wereturned to Mexico and from thence to Zumpango, to visitthe Nochistongo cut. Here the English engineering firmof Reed & Campbell were engaged in digging a huge tun-nel to drain the valley of Mexico, and especially lakeZumpango, whose waters had long threatened the destruc-tion of the City of Me
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