MUSCULAR SYSTEM OF MAMMALIA. 



17 



The Insectivora afford examples of special muscular develope- 

 ment in the fore part of the trunk and pectoral limbs of the Mole, 

 fig. 6, and in the muscles which act upon the prickly skin of 



the Hedgehog, figs. 7 and 8. 



The dermal muscles are powerful and extensive in all Insec- 

 tivora : in the Mole ( Talpa europcea) 9 fig. 6, the insertion of 

 one of these is seen at a : it assists in retracting the trowel-like 



Muscles of the fore part and limbs of a Mole (Talpa europcea). XLIII. 



fore limb ; and, when this is the fixed point, draws forward the 

 pelvis and thigh. The muscles of the scapula are singularly de- 

 veloped and modified : the trapezius operates upon the short base 

 of the elongate bone with great advantage. The anterior portion, 

 d, arising from the occiput, derives further strength from the ossi- 

 fied ' nuchal ligament,' and is inserted at e : the part answering to 

 the posterior fibres of the muscle, f, arises as far back as the 

 lumbar vertebne to be similarly inserted into the base of the sca- 

 pula, antagonising the former. The f splenius capitisj A, derives 

 fibres from the nuchal style, as well as from certain dorsal and 

 cervical vertebra? : it is inserted into the paroccipital region of the 

 cranium. The stemo-mastoid, g, joined by a ( cleido-mastoid ' 

 from the cubical clavicle, is a very powerful muscle which expands 

 to be inserted into the lateral part of the superoccipital and fascia 

 covering the mandibular angle. The deltoid, k, coextensive with 

 VOL. I IT. C 



