In 1852 (Proc. Acad. Nat. Sci. Phila., vol. VI, pp. 3–5) _Hyops depressifrons_ and _Protochœrus prismaticus_ were further described, the first being placed in the genus _Dicotyles_. Both of these are now regarded as belonging to _Platygonus compressus_. The writer has considered it as probable that the peccary remains, as well as _Procyon priscus_ and _Anomodon snyderi_, are of Late Wisconsin age; but it is possible that they are somewhat older. The reader is referred to page 343, where the Pleistocene of the lead region is discussed. 2. _Alton, Madison County._—In the McAdams collection, of which a general account has been given on page 339, is a part of a lower canine tooth which apparently differs in no way from the corresponding canine of _Platygonus cumberlandensis_, found by Mr. J. W. Gidley in a limestone fissure near Cumberland, Maryland. On page 350 will be found a list of the species found in this fissure and their geological age. WISCONSIN. (Map 20.) 1. _Bluemounds, Dane County._—In 1862, Professor J. D. Whitney reported (Geol. Surv. Wisconsin, vol. I, pp. 135, 136) that he had discovered in a crevice at Bluemounds, accompanied by bones and some teeth of the mastodon, a buffalo, and a wolf, several fragments of jaws and some teeth and other bones of a peccary, in an excellent state of preservation. At the top of his page 134 Whitney indicates that these remains belonged to the species now called _Platygonus compressus_. On page 422 of the same volume Jeffries Wyman, in reporting on the vertebrate remains collected in the lead region, mentions only 3 teeth; and these, he said, differed much from either of the fossil species and agreed with the existing peccary. From Whitney’s note at the bottom of his page 135 we may suppose that these 3 teeth were found in Iowa, near Dubuque. It is probable that the teeth found at Bluemounds belonged to _Tagassu lenis_. In 1866 (Geol. Surv. Illinois, vol. I, p. 162), Whitney stated that from a crevice near Bluemounds he got peccary bones and teeth which were supposed to be identical with the animals now living. Leidy (Jour. Acad. Nat. Sci. Phila., vol. VII, p. 384) stated that he believed that teeth found in Wisconsin belonged to _Dicotyles lenis_. One can not be certain regarding the age of these animals found in this lead region. They are probably pre-Wisconsin. The age will be discussed on page 343. MARYLAND. (Map 20.)