METAMICIUC SECIMENTATrON AND HOMOLOGY. 247 
13 . Goodrich, E. S. — “ Yertebrata Craniata : Cjclostomes and Fishes,’” 
‘ Treatise on Zoology,’ Part 9, London, 1909. 
14 . “ Segmental Structure of the Motor Nerve-plexus,” ‘ Anat, 
Anz.,’ xxxvi, 1910. 
15. “ On the Segmentation of the Occipital Region of the Head 
in the Batrachia Urodela,” ‘ Proc. Zool. Soc., London,’ 1911. 
16 . Hamniarsten, O. D. — “ Z. d. Innervation d. Bauchflossen b. d. 
Teleostiern,” ‘ Morph. Jahrb.,’ xlii, 1911. 
17 . Jhering, H. von. — ‘ Das peripherische Nervensystem der Wirbel- 
thiere,’ Leipzig, 1878. 
IS. Paterson, F. G. — “ The Limb Plexuses of Mammals,” ‘ Journ. 
Anat. and Physiol.,’ vol. xxi, 1887. 
19 . Sewertzoff, A. N. — “ Studien u. d. Entwickl. der Muskeln., etc., d. 
Extreniitaten d. niederen Tetrapoda,” ‘ Bull. Soc. Imp. des. 
Natur. de Moscou,’ 1907. 
EXPLANATION OF PLATES 15 and 16, 
Illustrating Air. Edwin S. Goodrich’s paper, ^ Aletameric 
Segmentation and Homology.’ 
PLATES 15 AND 16. 
Diagram 1. — The position of the paired limbs as shown by the nerve- 
supply. The line o represents the hind limit of the head. The spinal 
nerves contri)3uting to the limb plexus are numbered. The range of 
the pectoral plexus is covered by a continuous line, that of the pelvic 
plexus by a broken line. S shows the position of the sacral vertebrae. 
Diagram 2. — The position and extent of the paired fins of Torpedo 
and Scymnus as shown by the nerve-supply (from the observations of 
Brans). A continuous line covers the pectoral plexus and a broken line 
the pelvic plexus. 
Diagram 3. — The position and extent of the paired fins of Osmerus 
eperlanus (after Hammarsten) and of Gadus merlangus. The first 
nerve in the former and the first two nerves in the latter pass through 
the skull. 
Diagram 4. — The nerve-supply of the paired fins of Gadus mer- 
langus: A in their natural position, aiid B with the pelvic brought 
back to its place of origin. 
