“The trigonid is formed by subequal protoconid and metaconid with the protoconid slightly mesiad of the metaconid.”

“So, for example, the tetrapod splenial developed a medially-directed twist of the ventral margin, exposing the splenial ventrally and mesially.”

“The labial surfaces of the plates are smooth, slightly convex both mesially and distally with a shallow concavity between.”

“If the shoulder has to be ground mesially or distally, this must be done during implantation but before closure of the soft tissue by suture.”