The chondrocranium of a 23-mm. necturus

✍ Scribed by Waldo Shumway; Richard L. Webb

• Publisher: John Wiley and Sons
• Year: 1932
• Tongue: English
• Weight: 910 KB
• Volume: 53
• Category: Article
• ISSN: 0362-2525
• DOI: 10.1002/jmor.1050530206

✦ Synopsis

Abstract

This study is based on a wax model reconstructed from serial sections stained with basic fuchsin and picro‐indigo‐carmine. It shows: 1) that the columna ethmoidalis and planum basale are chondrified at this stage; 2) that a cartilaginous antorbital process is present; 3) that the stapedial plate is cut out from the wall of the otic capsule; 4) that the so‐called crista trabecularis is an independent element homologous with the sphenolateralis of the Anura; 5) that the fourth visceral arch is not present and that the fifth is still in the precartilaginous stage; and, 7) that there is no evidence that a pro‐occipital vertebra is formed.