A\V y. spectl\ el\ . Digitized by Microsoft® 166 HISTOLOGY. these structures are rudimentary; if their closing plates ever rupture theyare soon restored so that permanent openings from the pharynx on the sideof the neck are not found. In mammals four clefts are indicated by ecto-dermal depressions… … g. c. r,illcl(j[l ; ■\n riF A \orsG DoG-i-TSH.iiK)LUh ; II., nasal pitt, sp.. ?lJiracle. Fig. 1S7. —Hh
Histology · Microscopy
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