154 
J. BEARD. 
III. The Development of Anterior Roots in Elasmobranchii . — 
His’s views. Parablast cells. Confirmation of Balfour’s statements (pp. 
192—196). 
IV. The Ganglionic Development in Different Classes of Ver- 
tebrates. — Identical results in all forms examined. Spencer’s statements 
on Amphibia partially erroneous. Goette’s views in 1875 not identical with 
mine (pp. 196 — 198). 
V. The Neural Ridge of Marshall. — Sagemehl’s researches on 
spinal gauglia. Onodi’s and His’s results on Chick. “ Zwischenriune ” has 
no existence. In head is also a “ Zwischenstrang.” No direct connection 
with formation of ganglia. Balfour’s views of origin of ganglia as outgrowths 
of central nervous system. Marshall’s position (pp. 199 — 207). 
VI. The Independent Epiblastic Origin of the Peripheral 
Nervous System. — Semper’s and Goette’s observations. Van Wijhe’s 
researches. Eroriep’s discoveries in Mammals. My statements on the system 
of lateral sense organs in Elasmobranchs. Spencer’s views of origin of nerves 
in Amphibia. Onodi’s results on Chicks. Researches recorded in this paper 
show entire peripheral sensory nerve-elements to be formed in- 
dependently of central nervous system from epiblast (pp. 
207—210). 
VII. The Relations of Cranial to Spinal Ganglia, and the 
Question of the Morphology of the Lateral Sense Organs. — 
Dohrn’s hypothesis. Eroriep’s conclusions (pp. 210 — 212). 
Eisig’s comparisons between Vertebrates and Annelids. — 
Eisig’s conclusions mainly hypothetical. Position of the question. 
The Homology of Parapodial and Spinal Ganglia proposed by 
Kleinenberg. — The difficulties still in the way of a comparison of the 
“ Seitenorgaue ” of Annelids and Vertebrates (pp. 212 — 216). 
VIII. Dr. Gaskell and the Eunctional Distribution of the 
Cranial Nerves (216 — 218). 
Resume (pp. 218 — 219). 
Literature cited (pp. 220 — 223). 
The researches recorded in the following pages were under- 
taken in consequence of a grant for the purpose made from 
the Government fund by the Grant Committee of the Royal 
Society. 
