Leptæna depressa. Wenlock.

Fig. 422.

Phacops caudatus, Brong. Wenlock, Aym. limest., and L. Ludlow.

Leptæna depressa, Sow., is common in this rock, but also ranges through the Lower Ludlow, Wenlock shale, and Caradoc Sandstone.

Fig. 423.