. College collection of palaeontology. ARTICULATA. [421, Cast]. Harpes ungula, Barrande. Head. From the Upper Silurian Limestone at Kronieprus, Bohemia. In this genus the head, which occupies more than a third in length of the whole ani- mal, is surrounded by a broad, flat margin, which is pioduced posteriorly nearly to the extreme end of the body. The body-segments and tail are usually wanting, as is the case in this specimen. Original in the Ward Collection of the University of No. 159. [423, Cast]. Homalonotus delphinocephalus, Murch. This genus is so named because the three-lob
. College collection of palaeontology. ARTICULATA. [421, Cast]. Harpes ungula, Barrande. Head. From the Upper Silurian Limestone at Kronieprus, Bohemia. In this genus the head, which occupies more than a third in length of the whole ani- mal, is surrounded by a broad, flat margin, which is pioduced posteriorly nearly to the extreme end of the body. The body-segments and tail are usually wanting, as is the case in this specimen. Original in the Ward Collection of the University of No. 159. [423, Cast]. Homalonotus delphinocephalus, Murch. This genus is so named because the three-lobed aspect, so characteristic of the family, is, in a great measure obliterated, and the back appears smooth and uniform. The cephalic and caudal shields are hyper- bolic; the rings number thirteen. This species is char- acterized by the distinct trilobation of the tail in all its stages of growth, as well as by its slender body and acute caudal extremity. The specimen is from the Upper Silurian at Dudley, England. Size, 7x4. No. 160. [426, Cast]. Ulaenus giganteus, Brong. The general form of this species is variable, from its contractility. It has ten articulations; prominent eyes, and large, convex buckler and caudal shield. This specimen is from the Lower Silurian, Angers, France, and is in the Ward Collection of the University of Rochester. No. 161. [428, Cast]. Lichas Boltoni, Green. This beautiful Trilobite is easily recognized by its peculiar scabrous surface, depressed body and head, and the free extremities of the segments pointing backwards. The thorax is large and is divided into eleven segments. It is from the Niagara Group (Upper Silurian), Lockport, N. Y., where it is a characteristic fossil, although not often found entire. Size, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward's Natu
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