20 Maine: agricuIvTural e^xperiment station. 1910. 



The significance of the letters in this figure is as follows : 

 A, anterior elongation of funnel ; P, posterior elongation of 

 funnel; F, funnel (ostium tubae ahdominale) ; D, dorsal liga- 

 ment; O, one half (left) of wall of anterior tubular portion 

 of the oviduct, from which the glandular part of the wall has 

 been removed by scraping; S, portion of the air sac wall. 



The anterior margin of the dorsal ligament shows along the 

 attachment to the anterior prolongation of the funnel. The 

 ventral margin shows along the attachment to the tubular por- 

 tion of the duct as far as this goes, and then as a cut edge from 

 which the duct has been removed. In order to spread the 

 dorsal ligament out flat in this preparation a cut was made near 

 the posterior end of the dorsal margin extending about half 

 way to the ventral margin. This cut shows just to the right of 

 the end of the anterior elongation of the funnel. 



A portion of the wall of the air sac (S) which is fused to 

 the dorsal part of the ligament is left attached. It is spread 

 back toward the dorsal margin of the ligament and is so trans- 

 parent that it shows only beyond the margin of the ligament 

 and between the edges of the cut made to flatten the latter. 

 The ventral margin of the band of fusion can be distinctly seen. 

 This photograph is about four-fifths natural size. 



Figure 8. A photograph showing the musculature of the 

 medial half of the caudal end of the isthmus and the portions 

 of the dorsal and ventral ligaments which attach to it. The 

 lateral half of this portion of the duct was removed by cutting 

 it along the attachment of the dorsal and ventral ligaments. The 

 glandular layer of the oviduct was scraped away leaving only 

 the muscular and peritoneal layers. In the photograph the. 

 dorsal ligament lies above and the ventral ligament below the 

 oviduct. The anterior end of the preparation lies to the left. 

 This photograph shows the lateral aspect of the preparation. 

 Natural size. 



Figure p. A photograph of the medial aspect of the same 

 preparation shown in lateral view in Figure 9. The dorsal lig- 

 ament lies above and the ventral ligament below the oviduct 

 as in figure 8. The anterior end of the preparation lies to 

 the right. Natural size. 



