NO. II DIGESTIVE CANAL OF AMERICAN AI.MCATOK — REESE 21 



tlciiluni noted, also, in ctmnoctidn with fi^nro 7. lias rclaiivcl\ thick, 

 wrinkled walls; its signilicancc is mii known to tlio writer. iM-oni 

 this diverticulum the duodenum. </, leads caudad and laterad for a 

 short distance as a narrow tuhe, then suddenly expands into the 

 widest part of the entire intestine. Into this wide part (d" the 

 duodenum, 3 or 4 mm. from the pylorus, opens the bile duet, IxL 

 The bile sac, bs, is an elong-ated oval body with thin v/alls, lyinj^f to the 

 rio-ht of the pylorus, its connection with the liver was not seen. 



Lying- between the anterior end of the duodemim and the posterior 

 end of the stomach, and extending caudad for 10 to 15 mm., in the 

 median plane of the animal is the pancreas. I^aii. Tl is a long narrow 

 bodv of a whitish color ; its duct or ducts could not be determined by 

 dissection. The duodenum extends caudad, with gradually diminish- 

 ing caliber, from the enlarged region mentioned above. About 10 to 

 15 mm. caudad to the stomach it makes a sort of double loop to the 

 right, a wide loop, Ip, and a close one, Ip', nearer the median plane. 

 iM-om the latter loop the intestine extends straight to the left, for a 

 distance of about 10 mm., where it makes a small loop cephalad, Ip', 

 and then ojiens to the yolk-sac. y. The yolk-sac is shown here 

 sim]ilv as an irregular piece of tissue, the yolk having been removed. 



The anterior intestinal portal, aip, and posterior intestinal portal. 

 pip, are in close proximity with eacli other. 



b^rom the posterior intestinal ]iortal Ihe intestine extends straight 

 cephalad to the posterior end of the stomach, dorsal to which it forms 

 a double loop, a wider one, lp\ and a narrow one, lp'\ From the 

 latter loop, lp\ the intestine extends straight catulad, parallel and 

 near to the straight region leading from the posterior intestinal 

 portal, until it reaches the region of the looj) lp\ dorsal to which it 

 forms a small loop, ip\ From loop Ip' the intestine, which is here 

 of very small caliber, extends caudad for about 10 mm., wliere it 

 forms another indistinctly double loop, Ip". 



From loop Ip" the large intestine, //, extends, with gradually in- 

 creasing caliber, to the cloaca, cl, a distance of 10 to 15 mm. 



Except in the enlarged region near the |jylorus the lumen of the 

 intestine is almost obliterated by the folding of its thick walls, so 

 that little or nothing can be told of its lining with the naked eye. 



A distinct mesentery holds the loops of the intestine in position 

 and binds the entire enteron close to the dorsal Imdy wall. I'.ecause 

 of the lack of properly fixed tissue no sections of the enteron of this 

 stas'e were made. 



