THE 



CANADIAN RECORD 



OF SCIENCE. (lJBF* 



^Vvv^^^ i ^ r ^ : 



VOL. II. APRIL, 1887. NO. 6. 



Physiology of the Heart of the Sea-Turtle. 



By T. Wesley Mills. 



(Concluded.) 



VII. Anatomy of the Sympathetic System of Nerves in the 

 Sea-Turtle. 



The detailed description which I have given of this 

 system for the Terrapin, 1 and which, judging from the 

 account of G-askell - and G-adow, applies largely also to the 

 land tortoise, may, with slight modification, be considered 

 as expressing the relations of the sympathetic, vagus, &c, 

 for one species of sea-turtle, viz., Chelona mydas. The resem- 

 blance in this respect of this one species to the Terrapin, 

 and its wide divergence from the other species of sea-turtle 

 examined by me, have been very surprising. 



In G mydas there is the same difference in the size of the 

 sympathetic and the vagus ; the same tendency to union for 

 part of their course ; the marked distinctness of the ganglion 



1 Journal of Physiology, vol. vi., pp. 264-266. 2 Op. cit, 



22 



