His botanical acquisitions were, I believe, chiefly communicated to Professor Hooker, of Glasgow, through whom they were occasionally made known to the public. His collections of the ores of Uspallata and other parts of the Cordillera were given to the College Museum at Edinburgh. I am myself indebted to him for the best part of my information respecting the provinces of Cuyo. It was through him I obtained, amongst other curiosities from those parts, the very remarkable little animal which is figured in the annexed plate, and which is now in the collection of the Zoological Society of London. It has hitherto been only found in the provinces of Cuyo, and even there but rarely: it burrows in the ground, and in its habits somewhat resembles the mole, lying dormant during the winter months; the natives call it the Pichi-ciego. Dr. Harlan, of New York, was the first to give an account of it, from an imperfect specimen sent to him from Mendoza; and he gave it the name of _chlamyphorus truncatus_. European naturalists, however, doubted its existence till the point was settled beyond dispute by the arrival of my specimen, which fortunately was perfect, and in an excellent state of preservation. At the request of the council of the Zoological Society, Mr. Yarrell drew up a particular account of its osteology, which was published in the third volume of their Journal, and from which, with his permission, I extract the following observations upon its comparative anatomy. "From the representation of the skeleton and its different parts it will be perceived that the _chlamyphorus truncatus_ has points of resemblance to several other quadrupeds, but that it possesses also upon each comparison many others in which it is totally different. "It resembles the beaver (_castor fiber_) in the form and substance of some of the bones of the limbs, in the flattened and dilated extremity of the tail, and the elongation of the transverse processes of the lower caudal vertebræ, but no further. "It has much less resemblance to the mole (_talpa Europea_) than its external form and subterranean habits would induce us to expect. In the shortness and great strength of the legs, and in the articulation of the claws to the first phalanges of the toes, it is similar; but in the form of the bones of the anterior extremity, as well as in the compressed claws, it is perfectly different; nor do the articulations of the bones, nor the arrangement of the muscles, allow any of the lateral motion so conspicuous in the mole; the hinder extremities of the chlamyphorus are also much more powerful. It resembles the sloth (_bradypus tridactylus_) in the form of the teeth and in the acute descending process of the zygoma; but here all comparison with the sloth ceases.