Charles Doolittle Walcott

“ Four short processes project obliquely backward from each ridge into the glabellar depression. The four anterior processes are rudimentary and concealed by the hypostoma. The four posterior processes have rounded knob-like tubercles upon their upper extremities; the posterior pair attached opposite the inner posterior angles of the occipital depressions. ”

“ A low arching ridge separates the glabellar and neck depressions.
The occipital depressions include the spaces within the "doublure," glabellar ridges, and neck depression. Occipital cavity in the anterior lateral third. Glabellar and occipital depressions finely punctate.
The neck depression extends laterally as shallow grooves under the "doublure," deepest towards the central depression. Central depression a concave groove, the posterior margin reflected upward and forward, terminating in a thin edge, which articulates with the articular fold of the first thoracic segment. ”