308 



MAMMALIAN ANATOMY 



(Fig. 222) as the eighth and ninth scrolls, and on the inner aspect 

 (Fig. 219) it is seen in the interval between the posterior roots of the 

 fifth (4") and seventh (6) scrolls. It is a small triangular piece, and 



Attachment to Cribri- 

 form Plate. 



Fifth Inner Scroll, k" . J5SJ 



Opposite Upper Surface of 



Fifth Piece. 

 Opposite Upper Surface of 



Sixth Piece. 



FIG. 233. 



fourth Inner Scroll, V. 



External Anterior Small 

 Scrolls, !>'". 



Fifth Inner Scroll, subdivided. 



Fourth Inner Scroll, subdivided. 

 With Tomer and Palatine. 



FOURTH PIECE OF LATERAL ETHMOID, INNER ASPECT. 



shows on its outer side (Fig. 234) the usual three parts, but the upper 

 scroll (5 f ) is but slightly rolled, and is expanded at the anterior end 

 so as to form with the narrow superior surface a convex area, which is 



FIG. 234. 



Eighth Outer Scroll, 5' ; opposite posterior part of Fourth Piece. 



-Attachment to Cribriform Plate. 



'Xinth Outer Scroll, 5". 

 Partition, 5. 



FIFTH PIECE OF LATERAL ETHMOID, OUTER ASPECT. 



received into a corresponding concave area in the posterior part of 

 the inner surface of the fourth piece (4"). The partition (5} curves 

 downward and covers much of the lower scroll (5"). 



FIG. 235. 



Sixth Inner Scroll, 5; opposite upper surface of Sixth Piece. 

 Attachment to Cribriform Plate. 



FIFTH PIECE OF LATERAL ETHMOID, INNER SURFACE. 



The inner surface (Fig. 235), which is also the lower surface, is 

 triangular and entire, and fits over the upper surface of the upper 

 scroll (6') of the sixth piece (Fig. 237). 



The sixth piece is present on the outer surface (Fig. 222) as the 



