226 Professor Clark on a Case 



There is also a pancreas. The length of this portion of intestine 

 is 9^ inches long. It opens into a sac nearly of the same dimen- 

 sions and form as the stomach, situated in the common abdominal 

 space immediately over the umbilicus. 



There is another liver belonging to the fetus B, with a gall 

 bladder and ducts. The common duct is perforate for a very 

 small space, and ends in a band of condensed cellular substance 

 covered by peritoneum : which band is connected, by one ex- 

 tremity with the second spleen, and by the other with the lower 

 portion of the duodenum already mentioned. To the sides of the 

 sac, which filled the lower part of the common abdomen above 

 the umbilicus, are attached two coils of small intestine, each 

 closely packed, and each opening into, or arising from, the sac. 

 The coil, peculiar to the fetus A is \4\ inches long, that to the 

 fetus B 11 inches. They both terminate in a ccecuin with an 

 appendix vermiformis 1^ long in each. The large intestine from 

 the cceeum to the anus, is, for the fetus A 14 inches long, for 

 B 15 inches. The large intestines in both have this peculiarity, 

 that they are attached to a fan-like mesentery, and form coils 

 like the small intestines in the natural state. Their proportional 

 length is unusually great. Plate 13. Fig. /. 



The urinary organs in either fetus are altogether natural. 



The common umbilical chord consists of four arteries, and two 

 veins; a vein to each liver, and the arteries as usual. 



The arteral and venous systems are similar for each heart and 

 each fetus. 



From the left ventricle arises an aorta which, instead of the 

 three trunks which usually spring from its arch, sends off only 

 one: and this divides almost immediately into the common carotids 

 for one face, or (more correctly) into the right common carotid of 



