no.16144. NHW AND OLD CARBONIFEROUS FOSSILS-—GIRTY. 297 
could be referred to either genus with almost equal propriety, but it 
possesses a pretty well-developed dorsal septum. On that account it 
might best, perhaps, be referred to Rhynchonella, although internally 
and externally it appears to be generically related to certain Carbonif- 
erous shells which Hall and Clarke have placed with Pugnaw. 
This species is so dissimilar to any of our American Rhynchonel- 
loids that a comparison with them is scarcely necessary. Tscherny- 
schew has figured a similar species from the Gschel-stufe of Russia 
as Pugnax connivens.« Some enlarged figures of Pugnax dawsoniana 
given by Davidson” resemble the present species in a remarkable 
degree. I have not had specimens of P. dawsoniana for compari- 
son, but in view of the great difference in size of the two species, their 
wide geographic separation, and their probable great difference in geo- 
logic age and faunal association, such a comparison would,*I believe, 
show them to be distinct. Hall and Clarke* have figured a form 
from Windsor, Nova Scotia, referring it to Davidson’s species, which 
if correctly identified clearly shows that the latter is distinct from 
P. weeksi. 
This species is named in honor of Mr. F. B. Weeks, who, together 
with Mr. W. F. Ferrier, collected most of our material from the 
phosphate beds of Idaho. 
Locality and horizon.—Phosphate beds; 4 Montpelier, Idaho. 
Ly pe-specimens.—Cat. No. 53466, U.S.N.M. 
OMPHALOTROCHUS FERRIERI, new species. 
Shell rather small, consisting of 6 or 7 volutions. Diameter rarely 
if ever in excess of 30 mm. and usually 25 mm. or less. Height about 
half the diameter, variable. Spire low, with flatish top and rounded 
sides. Suture more or less strongly indented. Umbilicus deep and 
broad. Peritreme section from subcircular to transversely subellip- 
tical, sometimes more or less quadrangular, with a distinct peripheral 
carina. The horizontal axis of the peritreme section is almost per- 
pendicular to the axis-of revolution. The upper external portion of 
the peritreme between the carina and the suture is gently convex. It 
is marked by a revolving ridge, which is sometimes very indistinct, 
4'Tschernyschew. Com. Geol. [St. Petersburg], Mem., XVI, No. 2, 1902, p. 488, 
JOM, ib, Ties, Iz, Is, IS), AO, 
5b Davidson. Geol. Soe. London, Quart. Jour., XIX, 1863, p. 172, pl. rx, figs. 
13, 14. 
© \Sieuul ginel Clleneie, Col, Siiry, INGwwy Worl, Jeti, WIE Jen Ae jell sepaag, 1iessh 
30-38. ; 
@The term ‘ phosphate beds” refers to a phosphate-bearing horizon in the 
Upper Carboniferous of Utah and Idaho which has not yet received a formation 
“name. It will be fully described by Mr. F. B. Weeks in a forthcoming publica- 
tion of the U. S. Geological Survey.—G. H. G. 
