1 PROCEEDINGS OF THE 



It is a branch of the musculo-cutaneous, which, running in the sub- 

 stance of peroneus brevis, close to the fibula, appears in the lower 

 third of the leg, on the posterior surface of that muscle, to which it 

 o-ives branches. There is no peroneus quartus in this case as in the 

 others previously described. Reaching the ankle, the nerve becomes 

 very slender, and winds round the external malleolus beneath the 

 tendons of the peronei muscles, to reach the outer border of the exten- 

 sor brevis digitorum ; there it divides into two delicate twigs. The 

 one running parallel to the tendons of the peroneus brevis is lost in 

 the fascia at the base of the 4tli interosseous space ; the other enters 

 the outermost slip of the extensor brevis digitorum, in the substance 

 of which it runs as far as the base of the metatarsal bone. 



A microscopic examination of this filament dissected out of the 

 muscle proved it to be a single funiculus, enclosing from 20 to 25 

 raedullated nerve fibres. 



I have now examined in all 110 extremities from 55 subjects, and 

 have found the nerve as described above ending in the extensor brevis 

 digitorum 3 times in 2 subjects, one case being bilateral, the other 

 unilateral. In other 6 subjects I have traced it on one side as far as 

 the ankle, where it ended in the peroneal sheath. 



(2) Dr T. H. Bryce gave a lantern demonstration of microphoto- 

 graphs, demonstrating the maturation stages in the ovum of Echinus. 

 A full account will be published later. 



(3) Dr Arthur Robinson exhibited numerous stereoscopic views of 

 anatomical preparations. 



(4) Dr Donald exhibited specimens oi post-murte7u contracted Heads. 



(5) Dr R. S. Berry gave a lantern demonstration on the Compara- 

 tive Anatomy and Histology of the Catcal Apex — the Ajjpendix Vermi- 

 formis. This communication will appear in extenso in the October 

 number of the Journal of Anatomy and Physiology. 



(6) Professor A. F. Dixon read a preliminary note, illustrated by lan- 

 tern slides, upon certain Surface Markings of the Calvarium, and their 

 siqnificance. Among the most interesting of the markings present upon 

 the surface of the calvarivim are the grooves which are often found in 

 the frontal region, corresponding to the branches of the supraorbital 

 nerves. These grooves vary much in appearance, and may be simple 

 or branched, shallow or deep. They are often converted in part of 

 their course into tunnels. Sometimes they occur on one side of the 

 cranium only. Most frequently the grooves occur beneath the outer 

 branches of the nerve, but they also occur, in many cases, in connec- 

 tion with the inner branches. The grooves never cross the coronal 

 suture. They sometimes extend upwards from the supraorbital notch, 



