File:Pterygotus Problematicus.png
Fig. 1 a. Part of the claw of Pterygotus problematicus, Agass., from the Upper Ludlow Rock of Hagley Park, Herefordshire:— this is probably the fixed finger, and shows the striated spines of unequal size.
Fig. 1 b. Some of the spines, magnified.
Fig. 2 a. From the same slab:— a portion probably of the spinous edge of the abdomen, with one of the lateral appendages (*) attached.
Fig. 2 b. The appendage, fig. 2a*, magnified, to show the radiating striae and lateral teeth. This large spine or appendage may possibly be a terminal joint of one of the feet, pressed against the fragment, fig. 2 a, but not articulated with it.
Fig. 1 b. Some of the spines, magnified.
Fig. 2 a. From the same slab:— a portion probably of the spinous edge of the abdomen, with one of the lateral appendages (*) attached.
Fig. 2 b. The appendage, fig. 2a*, magnified, to show the radiating striae and lateral teeth. This large spine or appendage may possibly be a terminal joint of one of the feet, pressed against the fragment, fig. 2 a, but not articulated with it.