656 AGNES I. M. KLLIOT. 



Sewektzoff. — "Die Metamerie des Kopfcs von Torpedo," 'Anat. Anz.,' 



Bd. xiv, 1S98. 

 Van Wijiie.— "tjber die Mesodermsegmeiite und die Eutwickelung der 



Nerven des Selacliierkopfes," Amsterdam, 1S83, 



EXPLANATION OF PLATES 39 AND 40, 



Illustratiug Miss Agnes I. M. Elliot's paper on " Some Facts in 

 the later Development of the Frog, Ran a temporaria." . 



Abbreviations. 



Br. Brain. C.c.sp.c. Central canal of spinal cord. C.E.C. Cartilaginous ear 

 capsule. CI. Cloaca. Cl.mia. Cloacal muscles. C.N S. Central nervous 

 system. C.t. Connective tissue. Deg.cs. Degenerating cells. E. Eye. 

 Gan.V. Ganglion of V cranial nerve. Gan.VIH. Ganglion of VIII cranial 

 nerve. Gan.X. Ganglion of X cranial nerve. Gr.m.sp.c. Grey matter of 

 spinal cord. U.K. Head kidney. H.L. Hind limb. L.S. Lymph space. 

 Lg. Lung. Mes.AuL Mesoblast cells stretching forward from anterior 

 myotomes to otic capsule. Mes'"'^- Mesenchyme. 3fi/. 1 — 13. Myotomes 

 numbered from anterior end. In figures 5 and 6 myotome 1 is the first 

 myotome still remaining, and corresponds to myotome 3 in figures 1, 2, 3, 

 and 4. N.c. Nerve cell. Nek. Notochord. FcA. Parachordal cartilage. 

 Pr.O.A. Preoccipital arch. R.sp.gan. Eudimentary spinal ganglion. Sp.cd. 

 Spinal cord. Sp.gan. 1 — II. Spinal ganglia 1 — 11. V.as.br. Nerve trunk 

 running forward, formed from posterior roots of vagus. Vagus R.\. Pirst 

 root of vagus. Vagus R. G. Sixth root of vagus. V, I — 7. Dorsal cartila- 

 ginous arches corresponding to vertebrae 1 — 7- Wh.m.sp.c. White matter of 

 spinal cord. 



PLATE 39. 



Fig. 1. — Horizontal section of 9-millimetre tadpole, showing roots of vagus. 

 Magnification 260. 



Pig. 2. — Horizontal section of same tadpole, more ventral ; showing second 

 myotome and ascending roots of vagus. Magnification 100. 



