80 Proceedings of the Royal Iris/i Academy. 



fascia corering the muscle ; the mouth of the sac or fossa thus formed 

 looked upwards towards the ccBCum. 



The peritoneum lay on the fascia, to which it was only loosely con- 

 nected, and was easily separable from it, hut part of it was involuted 

 and tucked into the fundus of the sac. The subserous tissue was lax 

 and could be separated without difficulty. 



The measurements of the fascial fold were as follow : — 

 Its crescentic free border arose from the fascia over the psoas at a 

 part 3^ inches above Poupart's Ligament. 



The measurement across from the border of the psoas magnus to 

 the crest of the ilium was-2*7 inches. 



Its attachment extended S-g- inches behind the anterior superior 

 spine of the ilium. 



The sac itself was •? of an inch in depth. 



The fascia was quite free from the tendon of the psoas parvus, 

 which was inserted as usual. A branch of the anterior crural nerve 

 lay on the margin of the fascial fold fMrming its superficial edge. 



The ccECum had not descended nearly as far as usual, but lay loose 

 in the right lumbar region, attached by a mesoccecum four inches 

 broad, and which was continuous with? the mesentery. The vermiform 

 appendix lay within this mesoccecum, posterior and inferior to the 

 coscum, and with no trace of a mesenteriolum ; it was moderately long 

 and bent on itself at the lower end. There was no nerve on the free 

 edge of the smaller left "Fossa retro- sigmoidalis." There was a 

 cicatrix-like mark on the left side below the ]peeuliar fold, but no 

 sign of inflammation. 



This sac which we are considering maybe called the "Ketro- 

 ccecal Recessus;" it might easily become the seat of an hernia, and, 

 therefore, is of some importance. It diff'ers from the sac described by 

 Luschka in that the opening of the fossa described by him looked down- 

 wards, whereas that before us looked upwards. 



This abnormality is remarkable from the fact of its not having 

 been described before. It may, therefore, fairly be considered unique. 



