500 Notices of Memoirs—W. H. Hudleston— 
collection is worthy of a more detailed comparative study than that 
to which it has hitherto been subjected, and among the undescribed 
specimens most readily identified is a small fossil indistinguishable 
from the so-called ‘‘intermandibular arch” or ‘ presymphysial 
bone” of Onychodus.1 Through the kindness of Prof. Lindstrom, 
this specimen has been forwarded to the British Museum for 
examination, and it forms the subject of the following remarks. 
Four fractured teeth are exhibited, attached in close series to 
a narrow arched base, and the fossil is firmly imbedded in a hard 
matrix. It is evidently imperfect, but the base preserved is 0-005 
in length, and the uppermost and longest tooth has a nearly similar 
measurement. This tooth is slender, tapering, and gently curved, 
without any sigmoidal twist; and both it and the more imperfect 
teeth below are characterized by the relatively enormous size of the 
internal cavity. 
In its small dimensions the presymphysial dentition from Spitz- 
bergen most nearly approaches that of Onychodus anglicus,” from the 
Lower Old Red Sandstone Passage Beds of Ledbury, Herefordshire ; 
but it is distinguished by the more uniformly tapering character of 
the teeth, and the relatively larger size of the pulp-cavities. In 
the latter feature it seems to be more nearly paralleled by the much 
larger, typical species from the Devonian of the United States; but 
all described forms differ from the new fossil in the larger size of 
the teeth in proportion to their base of attachment. The Spitzbergen 
species, thus imperfectly indicated, may therefore be regarded as 
hitherto unknown, and, in reference to its interest from a distri- 
butional point of view, may be named Onychodus arcticus. 
INT CMRAKe AS). (Say AMeAIMFON LIES) - 
Tur Grotocy or Devon, Facts anp INFERENCES, FROM THE 
PRESIDENTIAL ADDRESS TO THE DEVONSHIRE AssocraTion. By 
W. H. Hupuzston, Esq., F.R.S., Sec.G.8., ete. August, 1889. 
E scan have little doubt that this South-western part of 
England had the honour of leading off the Geological 
Surveys of the world because of its great metallic wealth, and 
because of the interesting and complicated phenomena associated 
therewith. But it must not be supposed that the early Surveyors 
settled every question fifty years ago, especially when we bear 
in mind the varied nature of the region, the obscurity of many of 
the problems, and the comparative novelty of the task. Devonshire 
especially has been the theatre of many a geological battle since 
then, nor can we aver that the temple of Janus is at present closed. 
It is twenty-one years ago, I believe, since a President of the Devon- 
shire Association dealt with any of these topics from the chair. Mr. 
Pengelly, in the year 1868, after giving an admirable summary of 
1 J. S. Newberry, Geol. Survey of Ohio, vol. i. pt. ii, (Paleontology), pp. 
296-302, pts. XXvi. XXVil. 
® Smith Woodward, ‘‘ Note on the Occurrence of a Species of Onychodus in the 
Passage Beds of Ledbury,’’? Groz, Mac. Dec. III. Vol. V. (1888), p. 500. 
