114 C. D. Walcott—Paleontologic Notes. 
Art. XVIII. one stale de Notes; by CHARLES D, WALCOTT, 
of the U.S. Geological Survey. 
In reviewing the material from the St. John Group of New 
Brunswick, contained in the Hartt collection at Cornell Uni- 
versity, the following species were found : 
Hocystites afrbiontes Billings. 
Obol 
Orthie Billings Hartt. 
eo ae transversu Hartt, sp. 
?, sp. undet. 
Orthis, sp. ? 
Stenotheca Acadica Hartt, sp. 
Harttia Matthewi Walcott, n. gen., n. sp. 
Agnostus Acadicus Hartt. 
Microdiscus Dawsoni Hartt. 
M. punctatus Salter ?. : 
Paradoxides lamellatus Hartt. 
P. Acadicus Matthew 
P. Etiminicus Matth 
is Bib beet Matthoot Hartt. 
C. elegans 
U. (Salteria) "Baileyi Hartt. 
Ptychoparia Robbi oo 
P. Ouangondiana Hart 
i haictatin ts var. “Natok Hartt. 
P, quadrata poy 
P. Orestes Hart 
P. Orestes, sow “Thersites Hartt. 
P. tener Hart 
The Obolella transversa of Hartt is clearly allied to O. sag- 
ittalis vai eR is not a true Obolella, but represents a genus 
not yet 
Mr. Davigae called attention to the differences between 0. 
chromatica, the type of the genus, and O. sagittalis. Later Mr. 
S. W. Ford+ compared the two forms, and suggested that 0. sag- 
ittalis probably represented a new genus. When studying the 
Obolella-like forms from Nevada, I arrived at gr same con- 
clusion (1882),$ and placed the species in three groups, taking 
0. ge Bill., O. (desquamata) = crassa Hall, as typical of the 
onogt. Brit. Foss. Brach., p. 338. + This Journal, vol. xxi, p. 133, 1881, 
+ Pal Eureka District, Mon. ‘viii, U. 8. Geol. Survey. 
