1905.] ANATOMY OF THE FERRET- BADGER. 23 



The posterior cerebellar artei-ies are asymmetrical in their 

 origin from the basilar, the left being considerably in front of the 

 right. 



The middle cerebellar arteries arise in front of the sixth nerve. 



§ Some Notes on the Mioscles. 



The muscular anatomy of the Oarnivora has been lately treated 

 of in an exhaustive fashion by Messrs, Windle and Parsons*. As 

 a supplement to that paper (which does not deal with Helictis) I 

 am able to offer a few notes upon the musculature of Helictis 

 personata. 



The Sterno-mastoid consists from the very beginning of twO' 

 parts : the larger of these is inserted on to the mastoid next and 

 superficial to the cleido-mastoid muscle ; the smaller part crosses 

 the cleido-mastoid and joins the cephalo-humeral. This latter 

 portion of the muscle has been spoken of as a portion of the 

 trapezius, with which, indeed, it is plainly confluent above. 



The Sterno-hyoid and Ster no-thyroid appear to arise from the 

 sternum as one muscle. I could find no tendinous intersection. 



The Omohyoid is ajDparently completely absent. I could find no 

 trace of it. This muscle is usually present in Mustelidas. 



The Omotrachelian has exactly the relations described by Windle 

 and Parsons. 



The Rhomhoideus profundus, which arises from the supra-spinous 

 fossa of the scapula near to the root of the spine, is a slender muscle 

 inserted on to the atlas deej) of the omotracheal. It is perfectly 

 distinct at its origin from the Wiomboideus cerviccdis. Its 

 discovery in Helictis gives further support to Messrs. Windle and 

 Parson's belief that the muscle is eminently characteristic of the 

 Mustelidfe. 



The Rhomhoideus capitis has only a single oiigin in common with 

 the Rhomhoideus cervicalis, not the double origin of Ictonyx (a near 

 ally of Helictis) as figured by Windle and Parsons. 



The Dorso-ejiitrochlear is contiguous to and hardly if at all 

 distingviishable fi-om the extra head of the Triceps occurring in 

 this as in many other Carnivora. The Dorso-epitrochlear itself is 

 of course jjart of the Latissimus dorsi ; in passing by the scapula it 

 receives a mass of fibres from the lower border of that bone and 

 thence becomes continuous with a sheet of fibres arising from the 

 Teres and constituting, as I imagine, the "extra head" of the Tricejjs 

 of Messrs. Windle and Parsons, which those anatomists state to be 

 characteristic of the Mustelidae. 



The Biceps has only one head. 



Helictis appears to joossess two distinct Fahnaris long us muscles. 



The Sartorius is single and fused at its insertion with the also 

 single Gracilis. 



The Pectineus, often a double muscle, is single in Helictis. 



* P. Z. S. 1897, p. 370, & 1898, p. 152. 



