1 84 Journal of Comparative Neurology. 



In cross sections, as represented in Plate XIV, Figs, 9, 10 

 and II, we note the small size of the tendon fasciculi and the 

 large number of nuclei and that the non-medullated nerve fibers 

 penetrate the tendon fasciculi, while the terminal plate-like en- 

 largements are found clasping one or more of the smaller 

 bundles of connective tissue fibers of which the fasciculi are 

 composed. 



Golgi and Ciaccio, from the various reptilia which they ex- 

 amined, concluded that in this type of vertebrates, as in the 

 amphibia, the nerve endings were free and that no encapsulated 

 endings were found, as in the higher vertebrates. Pansini, how- 

 ever, while he finds the endings in the lizard either free or sur- 

 rounded by an imperfect sheath, finds in the turtle the begin- 

 ning of true Golgi neuro-tendinous organs, surrounded by a 

 distinct capsule of connective tissue. In the majority of our 

 preparations, the absence of a connective tissue sheath is easily 

 noted, the peculiar tendon fasciculi, on which the nerve ends, 

 fading off gradually into the ordinary tendon. But in some of 

 our preparations, we have been able to demonstrate a more or 

 less distinct capsule of connective tissue fibers, surrounding a 

 spindle-shaped group of fasciculi, on which a more or less com- 

 plex nerve ending was found. This capsule has been especially 

 well shown in transverse sections of the tendon, one of which 

 is shown in Plate XIV, Fig. 11. It maybe added that we 

 have usually found the encapsulated organs in the zone of pass- 

 age from muscle to tendon, while the non-encapsulated or free 

 endings were found deeper in the tendon and showing no rela- 

 tion to the muscle. There seems, however, to be no particular 

 tendon or part of the body in which encapsulated forms are 

 especially prevalent, but they are often found in the same ten- 

 don with non-capsulated endings. The nerve endings in the 

 encapsulated forms seem generally more complex than those in 

 the free ending. 



Bird. 



Golgi and Pansini describe, for the bird, endings like those 

 which they described for the lizard — networks of fine fibers at 

 the nodal points of which thickenings or nuclei are found. Ou» 



