378 DR. B. C. .\. WIVDLK WD MR. T. G. P.VKSOXS OX THE [Apr. 6, 



Sterno-mastoicl. — This muscle rises from the anterior part of the 

 sternum and is inserted into the occipital curved line, the para- 

 mastoid, and sometimes the paroccipital process ; it may be more or 

 less fused with the cleido-mastoid at its insertion. Among the 

 Yiverrida? Meckel (XXXIX.) has noticed that the sterno-mastoid 

 consists of two layers, superficial and deep, in Ilerpestes (22), and 

 we have confirmed liis observation in H. nepalensis (23) and 

 grisens (24). In Genetta miJr/ciris (18) the same arrangement 

 exists, but it was not noticed in Paradoxurus typus (19, 20) or 



Fig. 



dEN.HY QLOi 



DIG/IS TRIO 



( C IJT., 



HrO. 610S 



7MY. //r 



(CUT,) 



m 



Throat-muscles of Lutra vulgaris. 



Cryptopvocta (10) ; and neither Young ( YIII.) nor Macalister (IX.) 

 make any mention of a bilaminar condition in Viverra (12, 13). 

 Cuvier and Laiirillard (XII.) figure the trapezius as rising from the 

 sternum in the fTenet, and Lucae (XXXVI.) does the same in the 

 Otter, so that probably the explanation of the bilaminar sterno- 

 mastoid is that the superficial hiyer is really trapezius, and that in 

 those animals in which the muscle is unilaminar the sterno- 

 mastoid and trapezius have completely fused. In many cases 

 the sterno-mastoid is fused with its fellow of the opposite side 

 near its origin in the posterior part of the neck ; this seems to 

 occur most often among the Hyaenidse, Cauidae, Ursidte, Procyon- 

 idse, and Mustelidae, though it does not always happen in these 

 families — for instance, the two sterno- mastoids were fused in the 



