D.D.G 



14 



Figs. 13 and 14 X 60. Sections through the region of the ostium of th 

 duct of the digitiform gland. Fig. 13, of the model (fig. 26) of the post- valvula 

 intestine of an Acanthias embryo 95 mm. long, and fig. 14, a microscopic sec- 

 tion at a lower level showing the junction of the intestine with the duct of the 

 digitiform gland. CI., cloaca; D.D.Gl., duct of digitiform gland; Int., intestine 

 with lumen into which the digitiform duct opens; Oct., occluded portion of in- 

 testine anterior to digitiform duct; 0. D.D.GL, ostium of the duct of the digiti- 

 form gland; R.S., solid ridge which is continuous with the portion of the intes- 

 tine marked 'Int.' and which later splits to make the beginning of the lumen in 

 the occluded portion of the gut; R.D., solid ridge which is directly continuous 

 with the solid end of the duct of the digitiform gland; S.D., solid end of duct of 

 digitiform gland. 



347 



