U. S. GEOLOGICAL SURVEY 



MONOGRAPH 55 PLATE XLIII 



PEOBABLE ARRANGEMENT OF THE MUSCLES OF THE OCCffUT AND NECK IN AN OLIGOCENE 



TITANOTHERE (BRONTOPS ROBUSTTJS) AFTER THE PLATYSItfA, SPLENIUS, RHOMBOn)EUS, 



TEAPEZroS, AND LEVATOR SCAPULAE HAVE BEEN EEMOVED 



One-sixth natural size. Blue lines indicate deep muscles, red lines superficial muscles, and black lines the liga- 

 mentum nuchae ; x (blue) indicates a cut end of a muscle, and x (red) the origins of slips of the serratus cervicis 

 (levator scapulae) . To the uttermost rim of the lambdoidal crest was attached the splenius, and below this, on 

 the back of the mastoid region and paroccipital process, were the longissimus capitis and cephalo-humeralis 

 (cleido-mastoid). Beneath the splenius was the complexus (semispinalis capitis). The nuchal surface of the 

 occiput was filled by the obliquus capitis superior, the rectus capitis posticus major and minor, and the 

 Ugamentum nncbae. {After Gregory and Christman. ) 



