SOCIETY OF THE HNTVERSITY OF ABERDEEX. 63 



of that muscle, and from the interosseous membrane. Its tendon 

 passed through the compartment of the annular ligament containing 

 the tendons of the extensor communis digitorum and extensor indicis, 

 to be inserted into the aponeurosis covering the posterior surface of 

 the first phalanx of the middle finger, formed by the tendon of the 

 common extensor going to that finger, and the third lumbrical. 



(Signature of observer) R. P. G-ARROW. 



ORDINARY MEETING. 

 27Tii JUNE, 1903. 



Mr. ALEX. Low, A.M., M.B., Vice-President, 

 in the Chair. 



The Minutes of the last meeting were read and approved. 



Dr. R. G. Berry read a paper on the anatomical variations pre- 

 sented by two cases of twin monsters. Photographs of the two cases 

 were shown by a series of lantern slides. 



After a few remarks by the Chairman and by Professor Mac- 

 William, the meeting closed with a very hearty vote of thanks to 

 Dr. Berry for his extremely lucid and interesting paper. 



THE ANATOMICAL VAEIATIONS PEESENTE.D BY TWO CASES 



OF TWIN MONSTEES. 



By EICHARD J. A. BERRY, M.D., F.E.C.S. (Edin.), F.E.S. (Editi.), Lecturer 

 on Anatomy in the School of Medicine of the Eoyal Colleges, Edinburgh ; 

 Examiner in Anatomy, University of Aberdeen. 



(With Plates VI. -XIV.) 



Some time ago Dr. F. W. N. Haultain placed in my hands two 

 remarkable cases of twin monsters, at the same time requesting me 

 to ascertain what were the anatomical variations present. 



CASE I. Both the twins in this case, as in the second one, are 

 females. The twins are united together along the lateral abdominal 

 walls and possess two umbilical cords. The line of fusion and the 



