Today's special surprise was the arrival of some lower Devonian trilobites from Bolivia. Many of these are preserved in nodules, and so it is neat to keep the impression as well. Looking outside to see the new blanket of snow was a bit depressing, but there's nothing like a few trilobites to brighten the day.
From top to bottom, we have Malvinella buddeae, Eldredgeia eocryphaeus, and Eldredgeia venustus. The first one is rare, and the other two are fairly common - but not excessively so. These are found in the Belen Formation, way up in the La Paz region at an altitude of about 4000 ft. The seller I purchased these from seems to specialize in this region's fossils, and the prices were very reasonable. The E. venustus does have its tail tucked in behind, and from a side view looks like a slipper. I've added more detailed pictures in the trilobite gallery.