Among other specimens received from the Geological Survey of Canada are the fragmentary remains of a Crustacean (enumerated in Dr. Whiteaves' list as No. 10), comprising the abdomen (a), a small part of a carapace (b), and the penultimate joint of one of the chelate fore-limbs (c), occurring in detached fragments (probably parts of a concretionary nodule). They are labelled Red Deer River, Alberta Range 15, Township 23, west of the 4th principal meridian; collected by Mr. T. C. Weston, 1889. Although in so fragmentary a condition these specimens are of much interest, and are characteristic in their details.