62 The American Geologist. juiy, i89i 
laspis acaclica is referred to the Lower Helderberg group. Such is not 
my understanding of the age of the bed in which it was found. It is 
Slated in Trans. Roy. Soc. Can. Vol. VI, Sec. IV. p. 5.5, that this fish was 
found in dark carbonaceous shales which are beneath a groyp of beds con- 
taining a Niagara fauna, and that the shales are presumably of the age 
of the Clinton group. In the preliminary notice of this species it was 
said on the authority of Billings, that the fauna referred to above was 
a Lower Helderoerg fauna, but Mr. Ami after examining more exten- 
sive collections than those sent to Mr. Billings said it was of Niagara 
age. 
My excuse for troubling you with this letter is a desire to have the 
species credited to its true horizon. G. F. Matthew. 
St. John, N. B., May 13, '91. 
PERSONAL AXD SCIEXTIFIC XEWS. 
The Scientific meetings at Washington. The Am. Asso. 
Adv. Sci. will meet Aug. 19. The Geol. Soc. Am. will meet Aug. 
2-4,andtheIut. Cong. Geol. will meet Aug. 2 6. and continue to Sept. 
2. These meetings will all be held in the rooms of the Colum- 
bian Universit}-, Cor. of 15th and H. streets. A large lecture 
room, smaller rooms for meetings of the councils, exhibition of 
maps, rocks, minerals, etc. , have been courteously set apart b}' 
the Facult}' of the University for this purpose. 
The Organizing Committee, Int. Cong. Geol. proposes, besides 
the regular subjects of discussion, such as unfinished business of 
the former congress, reports of committees, etc. , that the follow- 
ing subjects be made special topics for the consideration of the 
congress at this meeting : 
I. Time correlation of the clastic rocks. 
1. Correlation by structural data. 
o. By stratigraphical data. 
b. By lithological data. 
c. By physiographical data. 
2. Correlation by paleontological data. 
a. By fossil plants. ( a. By marine fossils. 
or j 
h. By fossil animals. (z>. By terrestrial fossils. 
II. General geological color schemes and other graphic conventions. 
III. Genetic classification of the Pleistocene rocks. 
Award of GEOLdciirAi, 3Iki)als. The Geological Societ}- of 
London has awarded the various medals at its command to the fol- 
lowing persons : The Wollaston Medal to Prof. J. W. Judd, F. 
R. S. , for his work in Petrographj- and the balance of the fund to 
Richard L3-dekker, Esq., B. A., F. G. S., for his numerous and 
valuable contribution to Vertebrate Palaeontolog}-. The Murchi- 
son 3Iedal to Prof. AV. C. Br(')gger of Christiania, and the balance 
of the fund to the Rev. Richard Baron. F. L. S. , F. G. S. , of 
