The Cabinet of the Albany Institute. The Cabinet of Professor T. R. Beck. Albany Museum. The Cabinet of Dr. James Eights. ———— The Cabinet of the Rensselaer School. IN BALTIMORE. The Cabinet of Dr. Joshua J. Cohen. The Cabinet of the Baltimore College. The Cabinet of the Atheneum. The Baltimore Museum. ———— The Cabinet of Professor Hall, Mount Hope. TRILOBITES, &c. ·—▸⏵►●◓●◄⏴◂—· Genus Calymene. _Brongniart_. The name of this genus is derived from a Greek word which signifies _obscure_ or _concealed_. The fossil animals included by it are characterized as having contractile bodies; the buckler as bearing many tubercles or folds--the cheeks as being oculiferous, and the abdomen and tail as being composed of from twelve to fourteen articulations or joints, without any membranaceous expansion. The Calymenes in thickness are nearly semicylindrical, and the buckler in front presents a _chaperon_ or upper lip more or Jess raised. In perfect specimens, there is a small furrow which seems to indicate a separation between the upper and under parts of this kind of lip. The eyes are always raised, and frequently present the remarkable structure observable in many of the _crustacea_; but as this part is generally very prominent, the _reticulations_ of the eye are commonly worn off or injured. Professor Brongniart places but little confidence in any of the generic characters above enumerated, except the number of articulations of the abdomen: these, however, in our opinion, are more vague and uncertain than most of the others. The genus, however, we think may be readily identified, after becoming familiar with one well characterized species. The general aspect of the buckler is peculiar--the body is not so depressed as in most other genera, and the lateral lobes are destitute of all membranaceous expansion. To the genus Calymene, belongs the celebrated Dudley fossil, called _Entomolithus paradoxus_ by Blumenbach, but which is not the same organic relic, to which Linné applied that name. This genus includes a great number of species, and though some of them are said to be found in different and distant parts of the globe, they are according to our limited observation, for the most part confined, like recent species of animals, to particular districts. The C. polytoma, C. pulchella, C. bellatula, C. concinna, C. sclerops, and the C. punctata, all finely figured by Professor Dalman, and which are found in Sweden, have not yet been noticed in any part of North America.[12] [Footnote 12: See the valuable and extensive communication of J. W. Dalman, M. D., on the Trilobites, in the Transactions of the Swedish Academy for 1820, part 2d.]