Subject ASC0003sjl
The geological magazine, or, Monthly journal of geology.
[Decade 1]:v. 9 (1872), Page 437 (1872)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32580004
Keywords
fossil crustaceans trilobites classification genus Hemiaspis Hemiaspis sperutus Hemiaspis horridus head shield salter eye crustacean woodward wenlock shale tunnel dudley shell Palaozoic Crustacea Surface of the carapace covered in minute granular divided and form a Y- shaped ridege on each latero-anterior Curve Upward and outwards from posterior border Hemiaspis horridus - Posterior angle of the carapace spine along the hinder border of the shield median line of the carapace marked by one rounded and prominent tubercle and two elongated confluent ones