Plate XLV 



Figs. 15-17. Camera lucida outlines of the oral epithelium in frontal section 

 at the angulus oris, orbital angle, and in the caudal portion of the buccal 

 sulcus, from an embryo of 12.5 millimeters. Cloumbia Collection, No. 

 264 X So, reduced to J^. 



/. Buccal sulcus. 



2. Angulus oris. 



7. Orbital inclusion, pars lata. 



8. Orbital inclusion, pars cylindrica. 

 2p. Lingual sulcus. 



JO. Subma.xillary anlage. 



42. Craniolingual plane, 



.^j. Palatolingual plane. 



45. Palatomandibular plane. 



46. Maxillomandibular plane. 

 4g. Submaxillary ganglion. 

 5^. Meckel's cartilage. 



60. Palate process. 



62. Ectopalatine sulcus. 



6y. Mandibular nerve. 



68. Maxillary nerve. 



6g. Buccomasseteric nerve. 



7J. Masseter muscle. 



