. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . ER ACDTIROSTRIS, Ayres. Body subfusiform. Head slender and depressed ; snout tapering and acute. Eleven dorsalshields from the occiput to the anterior margin of the dorsal fin ; twenty-seven shields in thelateral series, and nine hetween the pectorals and the ventral fins. Greyish black above;yellowish white beneath. List of specimens. Cataloguenumber. No. ofspecimens. Sex andage. Locality. Whencollected. Collected by— Originalnumber. Na
. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . ER ACDTIROSTRIS, Ayres. Body subfusiform. Head slender and depressed ; snout tapering and acute. Eleven dorsalshields from the occiput to the anterior margin of the dorsal fin ; twenty-seven shields in thelateral series, and nine hetween the pectorals and the ventral fins. Greyish black above;yellowish white beneath. List of specimens. Cataloguenumber. No. ofspecimens. Sex andage. Locality. Whencollected. Collected by— Originalnumber. Nature of speci-mens. 6H 1 Adult. 1855 70. ACIPENSER M EDIROSr rRIS, Ayres. Body fusiform. Head stoutish ; snout rounded anteriorly, and abbreviated. Eleven dorsalshields from the occiput to the anterior margin of the dorsal fin ; thirty-seven shields *in thelateral series, and nine between the pectorals and ventral fins. Reddish brown above; yel-lowish beneath. List of specimens. Cataloguenumber. No. ofspecimens. Sex andage. Locality. Whencollected. Collected by— Originalumber. Nature of speci-mens. 615 1 Adult. San Francisco, Cal. 1855 Alcoholic. ..
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