36 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
mandibular ramus near the median line and its insertion on the basi- 
hyal. In section it appears as a median part of m. cerato-mandi- 
bularis 1, except anteriorly, where it extends forward beyond the 
origin of the latter. 
, 
: _-termnda, i, 
omo-hy. prf eae . 
Fic. F.— Ventral aspect of the head and neck with integument removed 
to show the superficial muscles. The right half of the mylo-hyoideus 
muscle is also removed exposing the underlying muscles. 
1, estn-clet-mast. | i 
Strhy. omo-hy, ona-hy prf ket-nd. 1 
Fic. G.— Right lateral aspect of the head with the mm. mylo-hyoideus and 
sphincter colli removed; digastric muscle (dep. md.) is cut at its insertion 
and turned up. 
M. cerato-mandibularis 3 (ker-md.*). This is a very small muscle | 
band, to which the above name is applied because, like the other two, 
it extends from the mandible to the hyoid apparatus. This, however, 
