248 RALPH EDWARD SHELDON 
connected with both hypothalamic and thalamic centers. But 
the discussion of these relations can be taken up more profitably 
after the connections of the diencephalic nuclei are more fully 
analyzed and particularly, after their embryological development 
has been studied. 
Some comment should be made on the bearing which the data 
given in this article make with respect to the morphology of the 
forebrain tela. It is clear from the facts presented that the fore- 
brain of the teleostean fishes contains primordial pallium and 
also the primordium of all important morphological structures 
found in the forebrain of higher vertebrates. The pallium of 
Rabl-Riickhard, then, is not the morphological equivalent of any 
portion of the wall of the forebrain of higher vertebrates but is 
simply a tela, derived from the Deckplatte of His. In fact there 
is no evidence anywhere in the phylogeny of the vertebrate brain 
that the Deckplatte gives rise to a nervous structure. The evi- 
dence which has been offered, then, gives additional support to 
the views of Studni¢ka, already accepted by Kappers, Johnston, 
Edinger and Herrick. 
Anatomical Laboratories, 
The School of Medicine, 
University of Pittsburgh. 
LITERATURE CITED 
All papers cited have been consulted, excepting those marked with an asterisk 
(*). The subject matter of articles so indicated was ascertained through reviews. 
Arcue., Orro 1895 Kurze Mittheilung iiber den histologischen Bau der Reich- 
schleimhaut embryonaler Teleostier. Sitzungsber. d. Gesellsch. f. 
Morphol. u. Physiol. i. Miinchen, Bd. 11, Hft. 2 u. 3, pp. 73-78. 
BeLtoncr, Gruserre 1880 Ricerche comparative sulla struttura dei centri 
nervosi dei Vertebrati. Mem. d. r. Accad. d. Lincei, Cl. se. F., ser. 
3, vol. 5, pp. 157-182, figs. 1-58. 
1885 Intorno all’ apparato olfattivo-ottico (nuclei rotondi, Fritsch) 
del cervello dei Teleostei. Ibid., ser. 4, vol. 1, pp. 318-323, pl. 1. 
Brookover, CHarutes. 1908 Pinkus’s nerve inAmiaand Lepidosteus. Science, 
N.S., vol. 27, pp. 913-914. 
1910 The olfactory nerve, the nervus terminalis and the preoptic 
sympathetic system in Amia calva, L. Jour. Comp. Neur., vol. 20, pp. 
49-118, pls. 1, text figs. 32. 
