40 The American Geologist. January, is'jt 
being a metamorphosis and a descendant of P a r ad oxides * 
Strittigraphically, at Swan ton, the Elliptocephalus zone is in 
contact with the Phillipsburgh formation, and it is foHowed 
toward the Green mountain range east of St. Albans by a 
thick black shale formation, in which no fossils have yet 
been found. 
Now comes one of those cases of exact determination of 
generic form, on which depend not only the correlation or 
equivalency of strata at great distance, but also the rule of 
stratigraphic classification. Below the zone of Paradoxides 
in Scandinavia, and in close contact with it, a fauna was 
found with a trilobite, which after being referred to Para- 
doxides was finally adjudged as belonging to the American 
genns EUiptucephnlus (Olenellati). The result was that the 
Scandinavian geologists insisted on placing the ElUptocephn- 
Ina (Olenellus) zone he\ow the Paradoxides zone. However, 
a Swedish paleontologist of the first order, Mr. G. Holm, gave 
a detailed description of Olenelliis [Elliptocepli(das) kjervlji, 
insisting on the differences existing between that species and 
the true ElliptocephalKs (Olenellus) as well as the true Para- 
doxides; for him it was a new genus ; but he did not go so 
far as to give a name to it. The learned palaeontologist of 
St. John, Mr. G. F. Matthew, agreed entirely with Mr. Holm, 
and justly and most appropriately gave to that new genus of 
trilobite the name Hohnia, in honor of Gerald Holm. As the 
other fossils accompanying IJolmia kjeridfi are entirely dif- 
ferent generically from those found at Georgia, the (correla- 
tion of the two formations in Scandinavia and Vermont, is a 
mistake made by a paljeontologic misrule, due to an errone- 
ous determination of fossil remains. 
Then came a most unfortunate interposition of the palaeon- 
tologist of the United vStates Geological Survey. In August, 
1888, Mr. C/. D. Walcott, in looking over the stratigraphy of 
*Ford showed the mistake of referring the trilobites first described 
by Emmons us tJlliptoceplialus asaphoides to OleiiUH, in ealUng it Ole- 
nellus, when instead of being related to Oleniis it is much more close to 
Paradoxides, reproducing in its embryology the form of a Paradoxides. 
In fact, the name so generally used lately ought to be dropped entirely, 
tu'st, on question of priority, and second, on account of the mistake 
made in regard to all the European and eastern Newfoundland speci- 
mens, which do not belong to that genus, but are truly another genus, 
called by Mr. Matthew Holmia. 
