| Typographical errors corrected by the etext transcriber: |
|---|
| averge depth=> average depth {pg 302} |
| produces these montrosities=> produces these monstrosities {pg 348} |
| secured a specimen of two=> secured a specimen or two {pg 360} |
| are always strictly cleanly=> are always strictly clean {pg 368} |
| Préjavelsky, Russian explorer, 276=> Préjavalsky, Russian explorer, 276 {index} |