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.