PLATE II.

LOWER SILURIAN (LLANDEILO AND CARADOC) TRILOBITES.

Fig. 1.   ASAPHUS TYRANNUS, Murch. Tail, and two thorax-segments, of a mode¬
rate-sized individual.    Llandeilo Flags, Llandeilo, Caermarthenshire.

2.   ASAPHUS  POWISII, Murch.     Body and taU of a fuU-sized specimen.
Trilobite Dingle, Welshpool.    Caradoc Sandstone.

3,4.   HOMALONOTUS  VULCANI, Murch.     [Asaphus, Sil. Syst.]     Cornden
HiU, Shropshire.   LlandeUo Flags.