1888] NATURAL SCIENCES OP PHILADELPHIA. 141 



NOTES ON THE MYOLOGY OF URSUS MARITIMUS. 

 BY EDWIN A. KELLEY. 



The subject of these notes was a young female polar bear, probably 

 about three years old, which recently died at the Zoological Gardens 

 in Philadelphia, and was received at the University through the 

 courtesy of Mr. A. E. Brown, Superintendent of the gardens. The 

 animal measured about four and a-half feet from nose to root of tail; 

 it had been rather roughly skinned and eviscerated, so that little 

 could be ascertained concerning the panniculus, abdominal and peri- 

 neal muscles. My attention was given mainly to the limbs, and I 

 have here mentioned only such muscles as seemed to present note- 

 worthy characters. 



Neck. Splenius commences in fascia at the second dorsal ver- 

 tebra and its muscular area diverges from the middle line until at 

 the point of insertion, on the lambdoidal ridge, it is over two inches 

 distant from its fellow of the opposite side. 



Trachelo-mastoid rises from the fourth cervical to the first dorsal 

 vertebra, blends more or less with the splenius anteriorly and shows 

 a tendinous inscription opposite the axis. 



Complexm has a small separate slip from the fourth cervical, and 

 behind that rises in common with the trachelo-mastoid to the first 

 dorsal. 



Transversalis cervicis inserts as usual into the last five cervicals 

 and a complexus tertius runs from the second, third and fourth 

 cervicals to the transverse process of the atlas. 



Sterno-mastoid is a stout muscle which blends with its fellow for 

 about a third of the way up the neck ; at the level of the shoulder 

 it divides into two bellies, a postero-internal one which continues to 

 the mastoid process, and a more slender antero-external head which 

 runs forward and outward, crossing obliquely the cleido-mastoid, 

 and blends with the adjacent cephalo-humeral. 



Cleido-mastoid has its usual relations, rising in common with the 

 sterno-mastoid and diverging from it about the middle of the neck, 

 to insert into the deep face of the cephalo-humeral at the shoulder; it 

 is much more slender than the sterno-mastoid. 



Omo-hyoid is a well developed ribbon about three quarters of an 

 inch in width, which rises from tlie anterior border of the scapula, 

 some distance back from the coracoid process, and follows a gently 

 curved line to the basi-hyal bone. 



